General Information and Business	12 Months Ended
General Information and Business	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General Information and Business	General Information and Business General Information MultiPlan Corporation, formerly known as Churchill Capital Corp III, was incorporated in Delaware on October 30, 2019 for the purpose of effecting a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or similar business combination with one or more businesses. On July 12, 2020, Churchill entered into the Merger Agreement by and among First Merger Sub, Second Merger Sub, Holdings, and MultiPlan Parent. On October 8, 2020, the Merger Agreement was consummated and the Transactions were completed. In connection with the Transactions, Churchill changed its name to MultiPlan Corporation and The New York Stock Exchange ticker symbols for its Class A common stock and warrants to "MPLN" and "MPLN.WS", respectively. The Transactions were accounted for as a reverse recapitalization. Under this method of accounting, Churchill has been treated as the acquired company for financial reporting purposes. This determination was primarily based on our existing stockholders being the majority stockholders and holding majority voting power in the combined company, our senior management comprising the majority of the senior management of the combined company, and our ongoing operations comprising the ongoing operations of the combined company. Accordingly, for accounting purposes, the Transactions were treated as the equivalent of MultiPlan issuing shares for the net assets of Churchill, accompanied by a recapitalization. The net assets of Churchill were recognized at fair value (which were consistent with carrying value), with no goodwill or other intangible assets recorded. Operations prior to the Transactions in these financial statements are those of Polaris and the retained earnings of Polaris has been carried forward after the Transactions. Earnings per share calculations for all periods prior to the Transactions have been retrospectively adjusted for the equivalent number of shares reflecting the exchange ratio established in the Transactions. Throughout the Notes to Consolidated Financial Statements, unless otherwise noted, "we," "us," "our", "MultiPlan", and the "Company" and similar terms refer to Polaris and its subsidiaries prior to the consummation of the Transactions, and MultiPlan and its subsidiaries after the Transactions. Business We are a provider of data analytics and technology-enabled solutions designed to bring affordability, efficiency and fairness to the U.S. healthcare industry. We do so through services focused on reducing medical cost and improving payment accuracy for the payors of healthcare, which are health insurers, self-insured employers and other health plan sponsors (typically through their health plan administrators), and, indirectly, the plan members who are the consumers of healthcare services. The Company, through its operating subsidiary, MultiPlan, Inc., offers these solutions nationally through its Analytics-Based Services, which reduce medical cost through data-driven algorithms which detect claims over-charges and either negotiate or recommend fair reimbursement using a variety of data sources and pricing algorithms, its Network-Based Services, which reduce medical cost through contracted discounts to form one of the largest independent preferred provider organizations in the United States, and outsourced network development and/or management services; and its Payment and Revenue Integrity Services, which reduce medical cost through data, technology, and clinical expertise deployed to identify and remove improper and unnecessary charges before or after claims are paid, or to identify and help restore and preserve underpaid premium dollars. We are a technology-enabled service provider and transaction processor and do not deliver health-care services, bear insurance risk, underwrite risk, provide or manage healthcare services, provide care or care management, or adjudicate or pay claims. Although the end beneficiary of our services are employers and other plan sponsors and their health plan members, for the most part our customers are payors. We offer these payors a single electronic gateway to a highly-integrated and comprehensive set of services in each of the above three categories, which are used in combination or individually to reduce the medical cost burden on their health plan customers and members while fostering fair and efficient payments to the providers. For the year ended December 31, 2021, our expansive network included access to over 1.2 million healthcare providers. Payors generally aim to pay provider claims at a discount to reduce cost, to eliminate any improperly billed charges before payment is made, and to recover any incorrectly paid charges after payment is made. Our Analytics-Based Services discount claims using data-driven negotiation and/or re-pricing methodologies to support payments to providers with whom contractual discounts are not possible and are generally priced based on a percentage of savings achieved. Also included in this category are services that enable lower cost health plans that feature reference-based pricing either in conjunction with or in place of a provider network. These services are generally priced at a bundled PEPM rate. Our Network-Based Services offer payors a broad network of discounted rates for providers with whom payors do not have a contractual relationship, and are priced based on either a percentage of savings achieved or at a per employee/member per month fee. This service category also includes customized network development and management services for payors seeking to expand their network footprint using outsourced services. These build services are generally priced on a per contract or other project-based price. Our Payment and Revenue Integrity Services use data, technology and clinical expertise to assist payors in identifying improper, unnecessary and excessive charges before or after claims are paid, as well as issues with premiums paid by CMS for government health plans caused by discrepancies with enrollment-related data. Payment and Revenue Integrity Services are generally priced based on a percentage of savings achieved.