<?xml version="1.0" encoding="US-ASCII"?>
<!-- EDGAR Online I-Metrix Xcelerate Taxonomy Schema, based on XBRL 2.1  http://www.edgar-online.com/ -->
<!-- Version: 6.20.1 -->
<!-- Round: 10 -->
<!-- Creation date: 2012-11-02T18:13:36Z -->
<!-- Copyright (c) 2005-2011 EDGAR Online, Inc. All Rights Reserved. -->
<schema xmlns="http://www.w3.org/2001/XMLSchema"
  xmlns:xbrli="http://www.xbrl.org/2003/instance"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:us-gaap="http://fasb.org/us-gaap/2012-01-31"
  xmlns:us-types="http://fasb.org/us-types/2012-01-31"
  xmlns:hum="http://www.humana.com/20120930"
  xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric"
  xmlns:num="http://www.xbrl.org/dtr/type/numeric"
  xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
  xmlns:country="http://xbrl.sec.gov/country/2012-01-31"
  xmlns:dei="http://xbrl.sec.gov/dei/2012-01-31"
  xmlns:invest="http://xbrl.sec.gov/invest/2012-01-31"
  targetNamespace="http://www.humana.com/20120930"
  elementFormDefault="qualified" attributeFormDefault="unqualified">
  <annotation>
    <appinfo>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DocumentDocumentandEntityInformation" id="DocumentDocumentandEntityInformation">
        <link:definition>101 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/StatementOfFinancialPositionClassified" id="Role_StatementOfFinancialPositionClassified">
        <link:definition>103 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/StatementOfFinancialPositionClassifiedParenthetical" id="Role_StatementOfFinancialPositionClassifiedParen">
        <link:definition>104 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/StatementOfIncomeInsuranceBasedRevenue" id="Role_StatementOfIncomeInsuranceBasedRevenue">
        <link:definition>105 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF INCOME</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/StatementOfOtherComprehensiveIncome" id="Role_StatementOfOtherComprehensiveIncome">
        <link:definition>106 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/StatementOfCashFlowsIndirectInvestmentBasedOperations" id="Role_StatementOfCashFlowsIndirectInvestmentBasedOperations">
        <link:definition>107 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" id="Role_NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock">
        <link:definition>108 - Disclosure - BASIS OF PRESENTATION</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsDescriptionOfNewAccountingPronouncementsNotYetAdopted" id="Role_NotesToFinancialStatementsDescriptionOfNewAccountingPronouncementsNotYetAdopted">
        <link:definition>109 - Disclosure - RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlock" id="Role_NotesToFinancialStatementsBusinessCombinationDisclosureTextBlock">
        <link:definition>110 - Disclosure - ACQUISITIONS</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock" id="Role_NotesToFinancialStatementsInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock">
        <link:definition>111 - Disclosure - INVESTMENT SECURITIES</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock" id="Role_NotesToFinancialStatementsFairValueDisclosuresTextBlock">
        <link:definition>112 - Disclosure - FAIR VALUE</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsMedicarePartDDisclosureTextBlock" id="Role_NotesToFinancialStatementsMedicarePartDDisclosureTextBlock">
        <link:definition>113 - Disclosure - MEDICARE PART D</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlock" id="Role_NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlock">
        <link:definition>114 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock" id="Role_NotesToFinancialStatementsEarningsPerShareTextBlock">
        <link:definition>115 - Disclosure - EARNINGS PER COMMON SHARE COMPUTATION</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock" id="Role_NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock">
        <link:definition>116 - Disclosure - STOCKHOLDERS' EQUITY</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlock" id="Role_NotesToFinancialStatementsIncomeTaxDisclosureTextBlock">
        <link:definition>117 - Disclosure - INCOME TAXES</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock" id="Role_NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock">
        <link:definition>118 - Disclosure - GUARANTEES AND CONTINGENCIES</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlock" id="Role_NotesToFinancialStatementsSegmentReportingDisclosureTextBlock">
        <link:definition>119 - Disclosure - SEGMENT INFORMATION</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlockTables">
        <link:definition>120 - Disclosure - INVESTMENT SECURITIES (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlockTables" id="Role_NotesToFinancialStatementsFairValueDisclosuresTextBlockTables">
        <link:definition>121 - Disclosure - FAIR VALUE (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsMedicarePartDDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsMedicarePartDDisclosureTextBlockTables">
        <link:definition>122 - Disclosure - MEDICARE PART D (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlockTables">
        <link:definition>123 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlockTables" id="Role_NotesToFinancialStatementsEarningsPerShareTextBlockTables">
        <link:definition>124 - Disclosure - EARNINGS PER COMMON SHARE COMPUTATION (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlockTables">
        <link:definition>125 - Disclosure - STOCKHOLDERS' EQUITY (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables">
        <link:definition>126 - Disclosure - SEGMENT INFORMATION (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureBASISOFPRESENTATIONAdditionalInformation" id="DisclosureBASISOFPRESENTATIONAdditionalInformation">
        <link:definition>127 - Disclosure - BASIS OF PRESENTATION - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureACQUISITIONSAdditionalInformation" id="DisclosureACQUISITIONSAdditionalInformation">
        <link:definition>128 - Disclosure - ACQUISITIONS - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureScheduleOfInvestmentSecuritiesClassifiedAsCurrentAndLongTerm" id="DisclosureScheduleOfInvestmentSecuritiesClassifiedAsCurrentAndLongTerm">
        <link:definition>129 - Disclosure - Schedule Of Investment Securities Classified As Current And Long-Term (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureScheduleOfGrossUnrealizedLossesAndFairValuesOfSecurities" id="DisclosureScheduleOfGrossUnrealizedLossesAndFairValuesOfSecurities">
        <link:definition>130 - Disclosure - Schedule Of Gross Unrealized Losses And Fair Values Of Securities (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureINVESTMENTSECURITIESAdditionalInformation" id="DisclosureINVESTMENTSECURITIESAdditionalInformation">
        <link:definition>131 - Disclosure - INVESTMENT SECURITIES - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureScheduleOfRealizedGainsLossesRelatedToInvestmentSecuritiesIncludedWithinInvestmentIncome" id="DisclosureScheduleOfRealizedGainsLossesRelatedToInvestmentSecuritiesIncludedWithinInvestmentIncome">
        <link:definition>132 - Disclosure - Schedule Of Realized Gains (Losses) Related To Investment Securities Included Within Investment Income (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureScheduleOfContractualMaturitiesOfDebtSecuritiesAvailableForSale" id="DisclosureScheduleOfContractualMaturitiesOfDebtSecuritiesAvailableForSale">
        <link:definition>133 - Disclosure - Schedule Of Contractual Maturities Of Debt Securities Available For Sale (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureFinancialAssetsMeasuredAtFairValueOnRecurringBasis" id="DisclosureFinancialAssetsMeasuredAtFairValueOnRecurringBasis">
        <link:definition>134 - Disclosure - Financial Assets Measured At Fair Value On Recurring Basis (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureFAIRVALUEAdditionalInformation" id="DisclosureFAIRVALUEAdditionalInformation">
        <link:definition>135 - Disclosure - FAIR VALUE - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureChangesInFairValueOfAssetsMeasuredUsingSignificantUnobservableInputs" id="DisclosureChangesInFairValueOfAssetsMeasuredUsingSignificantUnobservableInputs">
        <link:definition>136 - Disclosure - Changes In Fair Value Of Assets Measured Using Significant Unobservable Inputs (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureMEDICAREPARTDAdditionalInformation" id="DisclosureMEDICAREPARTDAdditionalInformation">
        <link:definition>137 - Disclosure - MEDICARE PART D - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureBalanceSheetAmountsAssociatedWithMedicarePartD" id="DisclosureBalanceSheetAmountsAssociatedWithMedicarePartD">
        <link:definition>138 - Disclosure - Balance Sheet Amounts Associated With Medicare Part D (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureChangesInCarryingAmountOfGoodwillByReportableSegments" id="DisclosureChangesInCarryingAmountOfGoodwillByReportableSegments">
        <link:definition>139 - Disclosure - Changes In Carrying Amount Of Goodwill By Reportable Segments (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureDetailsOfIntangibleAssetsIncludedInOtherLongTermAssets" id="DisclosureDetailsOfIntangibleAssetsIncludedInOtherLongTermAssets">
        <link:definition>140 - Disclosure - Details Of Intangible Assets Included In Other Long-Term Assets (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureGOODWILLANDOTHERINTANGIBLEASSETSAdditionalInformation" id="DisclosureGOODWILLANDOTHERINTANGIBLEASSETSAdditionalInformation">
        <link:definition>141 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureScheduleOfEstimatedAmortizationExpense" id="DisclosureScheduleOfEstimatedAmortizationExpense">
        <link:definition>142 - Disclosure - Schedule Of Estimated Amortization Expense (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureScheduleOfDetailsSupportingComputationOfEarningsPerShare" id="DisclosureScheduleOfDetailsSupportingComputationOfEarningsPerShare">
        <link:definition>143 - Disclosure - Schedule Of Details Supporting Computation Of Earnings Per Share (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureScheduleOfDetailsOfDividendPayments" id="DisclosureScheduleOfDetailsOfDividendPayments">
        <link:definition>144 - Disclosure - Schedule Of Details Of Dividend Payments (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureSTOCKHOLDERSEQUITYAdditionalInformation" id="DisclosureSTOCKHOLDERSEQUITYAdditionalInformation">
        <link:definition>145 - Disclosure - STOCKHOLDERS' EQUITY - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureINCOMETAXESAdditionalInformation" id="DisclosureINCOMETAXESAdditionalInformation">
        <link:definition>146 - Disclosure - INCOME TAXES - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureGUARANTEESANDCONTINGENCIESAdditionalInformation" id="DisclosureGUARANTEESANDCONTINGENCIESAdditionalInformation">
        <link:definition>147 - Disclosure - GUARANTEES AND CONTINGENCIES - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureSEGMENTINFORMATIONAdditionalInformation" id="DisclosureSEGMENTINFORMATIONAdditionalInformation">
        <link:definition>148 - Disclosure - SEGMENT INFORMATION - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.humana.com/taxonomy/role/DisclosureSegmentInformationBySegment" id="DisclosureSegmentInformationBySegment">
        <link:definition>149 - Disclosure - Segment Information by Segment (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:href="hum-20120930_cal.xml" xlink:title="Calculation Links, all"/>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:href="hum-20120930_def.xml" xlink:title="Definition Links, all"/>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:href="hum-20120930_lab.xml" xlink:title="Label Links, all"/>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:href="hum-20120930_pre.xml" xlink:title="Presentation Links, all"/>
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <import namespace="http://fasb.org/us-types/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-types-2012-01-31.xsd"/>
  <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/>
  <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/>
  <import namespace="http://fasb.org/us-gaap/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/country/2012-01-31" schemaLocation="http://xbrl.sec.gov/country/2012/country-2012-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/dei/2012-01-31" schemaLocation="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/invest/2012-01-31" schemaLocation="http://xbrl.sec.gov/invest/2012/invest-2012-01-31.xsd"/>
  <element name="AnvitaIncMember" id="hum_AnvitaIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ArcadianManagementServicesIncMember" id="hum_ArcadianManagementServicesIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AsoAndOtherMember" id="hum_AsoAndOtherMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BalanceSheetAccountAssociatedWithMedicarePartDTableTextBlock" id="hum_BalanceSheetAccountAssociatedWithMedicarePartDTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionDateOfAcquisitionAgreementMonthAndYear" id="hum_BusinessAcquisitionDateOfAcquisitionAgreementMonthAndYear" type="xbrli:gYearMonthItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CmsSubsidiesOrDiscountsMember" id="hum_CmsSubsidiesOrDiscountsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ContractExpirationDate" id="hum_ContractExpirationDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ContractTermYears" id="hum_ContractTermYears" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DepreciationAndAmortizationClassifiedAsBenefitExpense" id="hum_DepreciationAndAmortizationClassifiedAsBenefitExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DepreciationAndAmortizationIncomeStatement" id="hum_DepreciationAndAmortizationIncomeStatement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DilutiveSecuritiesAxis" id="hum_DilutiveSecuritiesAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="DilutiveSecuritiesNameDomain" id="hum_DilutiveSecuritiesNameDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAcquisitionsAdditionalInformationAbstract" id="hum_DisclosureAcquisitionsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureBalanceSheetAmountsAssociatedWithMedicarePartDAbstract" id="hum_DisclosureBalanceSheetAmountsAssociatedWithMedicarePartDAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureBasisOfPresentationAdditionalInformationAbstract" id="hum_DisclosureBasisOfPresentationAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureChangesInCarryingAmountOfGoodwillByReportableSegmentsAbstract" id="hum_DisclosureChangesInCarryingAmountOfGoodwillByReportableSegmentsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureChangesInFairValueOfAssetsMeasuredUsingSignificantUnobservableInputsAbstract" id="hum_DisclosureChangesInFairValueOfAssetsMeasuredUsingSignificantUnobservableInputsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureDetailsOfIntangibleAssetsIncludedInOtherLongTermAssetsAbstract" id="hum_DisclosureDetailsOfIntangibleAssetsIncludedInOtherLongTermAssetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureFairValueAdditionalInformationAbstract" id="hum_DisclosureFairValueAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureFinancialAssetsMeasuredAtFairValueOnRecurringBasisAbstract" id="hum_DisclosureFinancialAssetsMeasuredAtFairValueOnRecurringBasisAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationAbstract" id="hum_DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureGUARANTEESANDCONTINGENCIESAdditionalInformationAbstract" id="hum_DisclosureGUARANTEESANDCONTINGENCIESAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIncomeTaxesAdditionalInformationAbstract" id="hum_DisclosureIncomeTaxesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureINVESTMENTSECURITIESAdditionalInformationAbstract" id="hum_DisclosureINVESTMENTSECURITIESAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureMEDICAREPARTDAdditionalInformationAbstract" id="hum_DisclosureMEDICAREPARTDAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfContractualMaturitiesOfDebtSecuritiesAvailableForSaleAbstract" id="hum_DisclosureScheduleOfContractualMaturitiesOfDebtSecuritiesAvailableForSaleAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfDetailsOfDividendPaymentsAbstract" id="hum_DisclosureScheduleOfDetailsOfDividendPaymentsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfDetailsSupportingComputationOfEarningsPerShareAbstract" id="hum_DisclosureScheduleOfDetailsSupportingComputationOfEarningsPerShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfEstimatedAmortizationExpenseAbstract" id="hum_DisclosureScheduleOfEstimatedAmortizationExpenseAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfGrossUnrealizedLossesAndFairValuesOfSecuritiesAbstract" id="hum_DisclosureScheduleOfGrossUnrealizedLossesAndFairValuesOfSecuritiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfInvestmentSecuritiesClassifiedAsCurrentAndLongTermAbstract" id="hum_DisclosureScheduleOfInvestmentSecuritiesClassifiedAsCurrentAndLongTermAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfRealizedGainsLossesRelatedToInvestmentSecuritiesIncludedWithinInvestmentIncomeAbstract" id="hum_DisclosureScheduleOfRealizedGainsLossesRelatedToInvestmentSecuritiesIncludedWithinInvestmentIncomeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSegmentInformationAdditionalInformationAbstract" id="hum_DisclosureSegmentInformationAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSegmentInformationBySegmentAbstract" id="hum_DisclosureSegmentInformationBySegmentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureStockholdersEquityAdditionalInformationAbstract" id="hum_DisclosureStockholdersEquityAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DocumentDocumentandEntityInformationAbstract" id="hum_DocumentDocumentandEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EmployerGroupMember" id="hum_EmployerGroupMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EstimatedAmortizationExpenseForCurrentYear" id="hum_EstimatedAmortizationExpenseForCurrentYear" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpectedAmortizationExpenseLineItems" id="hum_ExpectedAmortizationExpenseLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpectedAmortizationExpenseTable" id="hum_ExpectedAmortizationExpenseTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ExpirationDateOfNewAuthorization" id="hum_ExpirationDateOfNewAuthorization" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems" id="hum_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTable" id="hum_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="FairValueAssetsMeasuredOnRecurringBasisUnobservableInputsReconciliationByAssetTypeAxis" id="hum_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputsReconciliationByAssetTypeAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="FairValueAssetsMeasuredOnRecurringBasisUnobservableInputsReconciliationByAssetTypeDomain" id="hum_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputsReconciliationByAssetTypeDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueMeasurementTransfersBetweenMeasurementLevelsOneAndTwo" id="hum_FairValueMeasurementTransfersBetweenMeasurementLevelsOneAndTwo" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FourthQuarterTwentyTwelveMember" id="hum_FourthQuarterTwentyTwelveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FullyInsuredMember" id="hum_FullyInsuredMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GeneralObligationBondsAsPercentageOfTaxExemptMunicipalSecuritiesThatWereNotPreRefunded" id="hum_GeneralObligationBondsAsPercentageOfTaxExemptMunicipalSecuritiesThatWereNotPreRefunded" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoodwillAndOtherIntangibleAssetsLineItems" id="hum_GoodwillAndOtherIntangibleAssetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoodwillAndOtherIntangibleAssetsTable" id="hum_GoodwillAndOtherIntangibleAssetsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="GovernmentAndHealthPlanMemberSubsidiesAmount" id="hum_GovernmentAndHealthPlanMemberSubsidiesAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="HealthAndWellBeingServicesMember" id="hum_HealthAndWellBeingServicesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="HealthCareCostPayments" id="hum_HealthCareCostPayments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="HealthCareCostPaymentsAndReimbursementsNet" id="hum_HealthCareCostPaymentsAndReimbursementsNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="HealthCareCostReimbursements" id="hum_HealthCareCostReimbursements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxesLineItems" id="hum_IncomeTaxesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InvestmentsClassifiedByContractualMaturityDateLineItems" id="hum_InvestmentsClassifiedByContractualMaturityDateLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InvestmentsClassifiedByContractualMaturityDateTable" id="hum_InvestmentsClassifiedByContractualMaturityDateTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="MaximumPercentageOfAnyGeneralObligationBondsInOneState" id="hum_MaximumPercentageOfAnyGeneralObligationBondsInOneState" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="McciHoldingsLlcMember" id="hum_McciHoldingsLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MedicaidAndOtherMember" id="hum_MedicaidAndOtherMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MedicaidMember" id="hum_MedicaidMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MedicareAdvantageMember" id="hum_MedicareAdvantageMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MedicareMember" id="hum_MedicareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MedicarePartDDisclosureTextBlock" id="hum_MedicarePartDDisclosureTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MedicareStandAlonePrescriptionDrugPlanMember" id="hum_MedicareStandAlonePrescriptionDrugPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MetropolitanHealthNetworksIncMember" id="hum_MetropolitanHealthNetworksIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MilitaryServiceMember" id="hum_MilitaryServiceMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetCurrentLiabilityAsset" id="hum_NetCurrentLiabilityAsset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NewTricareSouthRegionContractMember" id="hum_NewTricareSouthRegionContractMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NoncompetesAndOtherMember" id="hum_NoncompetesAndOtherMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfStates" id="hum_NumberOfStates" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OneBillionDollarAuthorizationMember" id="hum_OneBillionDollarAuthorizationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems" id="hum_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTable" id="hum_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="OtherBusinessesMember" id="hum_OtherBusinessesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfCollateralRelatedToPrimeLoan" id="hum_PercentageOfCollateralRelatedToPrimeLoan" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfCorporateSecuritiesAssociatedWithFinancialServicesIndustry" id="hum_PercentageOfCorporateSecuritiesAssociatedWithFinancialServicesIndustry" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfTaxExemptSecurities" id="hum_PercentageOfTaxExemptSecurities" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfTaxExemptToMunicipalSecuritiesClassifiedAsPreRefunded" id="hum_PercentageOfTaxExemptToMunicipalSecuritiesClassifiedAsPreRefunded" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfTotalDebtSecurities" id="hum_PercentageOfTotalDebtSecurities" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfTotalPremiumAndServicesRevenues" id="hum_PercentageOfTotalPremiumAndServicesRevenues" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PharmacyMember" id="hum_PharmacyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PriorAuthorizationMember" id="hum_PriorAuthorizationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PriorPeriodMedicalClaimsReserveDevelopment" id="hum_PriorPeriodMedicalClaimsReserveDevelopment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrivatePlacementsVentureCapitalMember" id="hum_PrivatePlacementsVentureCapitalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProviderMember" id="hum_ProviderMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PuertoRicoHealthInsuranceAdministrationContractsEastSoutheastAndSouthwestRegionsMember" id="hum_PuertoRicoHealthInsuranceAdministrationContractsEastSoutheastAndSouthwestRegionsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RetailMember" id="hum_RetailMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RiskCorridorSettlementsMember" id="hum_RiskCorridorSettlementsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfBalanceSheetComponentsLineItems" id="hum_ScheduleOfBalanceSheetComponentsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfBalanceSheetComponentsTable" id="hum_ScheduleOfBalanceSheetComponentsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfDividendsDeclaredAndPaidTableTextBlock" id="hum_ScheduleOfDividendsDeclaredAndPaidTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfIncomeTaxTable" id="hum_ScheduleOfIncomeTaxTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="SegmentReportingDisclosureLineItems" id="hum_SegmentReportingDisclosureLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SegmentReportingDisclosureTable" id="hum_SegmentReportingDisclosureTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="SegmentReportingInformationBySegmentSecondaryAxis" id="hum_SegmentReportingInformationBySegmentSecondaryAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="SegmentReportingInformationBySegmentSecondaryDomain" id="hum_SegmentReportingInformationBySegmentSecondaryDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorBridgeFamilyCompaniesIncMember" id="hum_SeniorBridgeFamilyCompaniesIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ServicesMember" id="hum_ServicesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SettlementPeriodAxis" id="hum_SettlementPeriodAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="SettlementPeriodDomain" id="hum_SettlementPeriodDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareRepurchasesRelatedToEmployeeStockBasedCompensationAwardsShares" id="hum_ShareRepurchasesRelatedToEmployeeStockBasedCompensationAwardsShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareRepurchasesRelatedToEmployeeStockBasedCompensationAwardsValue" id="hum_ShareRepurchasesRelatedToEmployeeStockBasedCompensationAwardsValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SpecialRevenueBondsAsPercentageOfTaxExemptMunicipalSecuritiesThatWereNotPreRefunded" id="hum_SpecialRevenueBondsAsPercentageOfTaxExemptMunicipalSecuritiesThatWereNotPreRefunded" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SpecialtyMember" id="hum_SpecialtyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockholdersEquityNoteLineItems" id="hum_StockholdersEquityNoteLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockholdersEquityNoteTable" id="hum_StockholdersEquityNoteTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="TotalInvestedAssets" id="hum_TotalInvestedAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UpperLimitPercentageOfLevelThreeAssetsToTotalInvestedAssets" id="hum_UpperLimitPercentageOfLevelThreeAssetsToTotalInvestedAssets" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UsTreasuryAndAgencyObligationMember" id="hum_UsTreasuryAndAgencyObligationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>
