EXHIBIT 99
                     WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
                                  MASTER SERVICING
                         MORTGAGE PASS-THROUGH CERTIFICATES
                             12/2002 DISTRIBUTION REPORT

SERIES:  wamu 2002-ar10                                WEIGHTED AVERAGE PC RATE:    5.09462%
POOL NUMBER:  Group 1 = 1931
____________________________________________________________________________________________

ISSUE DATE:  08/27/2002
CERTIFICATE BALANCE AT ISSUE:  $1,299,312,842.29

                                                                 CERTIFICATE
                                                   TOTAL         ACCOUNT            CERTIFICATE
                                                   NUMBER OF     ACTIVITY           BALANCE
                                                   MORTGAGES     (@PC RATE)         OUTSTANDING
                                                   _________  __________________  __________________

BALANCES FROM LAST FISCAL MONTH-END:                    1824                       $1,194,461,363.37
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month                     $220,263.54
Unscheduled Principal Collection/Reversals                         $2,477,046.91
Liquidations-in-full                                      63      $49,092,358.89
Net principal Distributed                                         $51,789,669.34    ($51,789,669.34)

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):                                                          $0.00

BALANCE CURRENT FISCAL MONTH-END:                       1761                       $1,142,671,694.03

SCHEDULED INTEREST AT MORTGAGE RATE:                               $5,624,666.63

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals                                  $0.00
Interest Uncollected on Liquidation                                        $0.00
Interest Uncollected on Non-Earning Assets                                 $0.00
Net Unscheduled Interest Distributed                                       $0.00

OTHER:
Loan Conversion Fees                                                       $0.00
Expense Reimbursements                                                     $0.00
Gain on Liquidations                                                       $0.00
Hazard Insurance Premium Refunds                                           $0.00
Net Other Distributions                                                    $0.00

SCHEDULED SERVICING FEE EXPENSES:                                    $547,461.36

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals                              $0.00
Servicing Fees Uncollected on Liquidation                                  $0.00
Servicing Fees Uncollected/Non-Earning Assets                              $0.00
Net Unscheduled Service Fees Distributed                                   $0.00

MISCELLANEOUS EXPENSES:                                                    $0.00

NET FUNDS DISTRIBUTED:                                            $56,866,874.61







                     WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
                                  MASTER SERVICING
                         MORTGAGE PASS-THROUGH CERTIFICATES
                             12/2002 DISTRIBUTION REPORT

SERIES:  wamu 2002-ar10                                WEIGHTED AVERAGE PC RATE:    5.09462%
POOL NUMBER:  Group 1 = 1931
____________________________________________________________________________________________


AGGREGATE LOSS AMOUNTS FROM INCEPTION OF POOL
  Loan Count Of              Aggregate Loss
  Incurred Loss                  Amount
__________________         _________________

                 0                     $0.00
*Aggregate Loss Amount and Count do not include this month's activity


SUMMARY OF DISTRIBUTIONS FOR CURRENT CYCLE
     Principal          Scheduled         Interest        Net Interest                            Total
   Distribution       Interest Due       Adjustment       Distribution         Other          Distribution
__________________  ________________  ________________  ________________  ________________  ________________

    $51,789,669.34     $5,077,205.27             $0.00     $5,077,205.27             $0.00    $56,866,874.61


INSURANCE RESERVES
                         Original         Claims In          Claims           Coverage          Coverage
  Insurance Type         Balance          Progress            Paid           Adjustments        Remaining
___________________  ________________  ________________  ________________  ________________  ________________

MPI                             $0.00             $0.00             $0.00             $0.00             $0.00
Special Hazard         $27,117,200.00             $0.00             $0.00             $0.00    $27,117,200.00
Bankruptcy Bond
   Single-Units           $129,000.00             $0.00             $0.00             $0.00       $129,000.00
   Multi-Units                  $0.00             $0.00             $0.00             $0.00             $0.00
Mortgage Repurchase    $25,986,257.00             $0.00             $0.00             $0.00    $25,986,257.00


DELINQUENT INSTALLMENTS
ONE                          TWO                          THREE
Count  Principal Balance     Count  Principal Balance     Count  Principal Balance
_____  _________________     _____  _________________     _____  _________________

   14      $9,404,357.85         1        $347,299.51         1        $575,200.00

FOUR                         IN FORECLOSURE               ACQUIRED
Count  Principal Balance     Count  Principal Balance     Count  Principal Balance
_____  _________________     _____  _________________     _____  _________________
    0              $0.00         0              $0.00         0              $0.00



The Class Principal Balances of each Class of the Class B1, B2, B3, B4, B5, B6
Certificates immediately after the principal and interest distribution on
12/25/2002 are as follows:




                Class       Class Principal Balance
                B1                $14,931,036.86
                B2                $11,035,896.88
                B3                 $5,193,186.89
                B4                 $2,596,093.81
                B5                 $1,946,570.73
                B6                 $3,248,357.16
                              __________________
                Total             $38,951,142.33
                              ==================


Capitalized items used but not defined herein have the meanings ascribed to
them in the Prospectus Supplement.





                                                                           EXHIBIT 99

                  DELINQUENT* MORTGAGE LOANS (As of November 31, 2002):

SERIES:  2002-ar10              POOL NUMBER:  Group 1 = 1931

                           I                     II                      III
                     Total Loans In        Total Delinquent        Loans Delinquent
                     Mortgage Pool              Loans                  1 Month
                  --------------------   ---------------------   ---------------------

Dollar Amount:     $1,142,671,694.03**       $10,326,857.36***        $9,404,357.85***
Number:                         1894                     16                      14
% of Pool:                    100.00%                  0.90%                   0.82%
(Dollars)
% of Pool:                    100.00%                  0.84%                   0.74%
(No. of Loans)


                           IV                      V                      VI
                    Loans Delinquent        Loans Delinquent           Loans In
                        2 Month                 3 Month               Foreclosure
                  --------------------   ---------------------   ---------------------

Dollar Amount:          $347,299.51***          $575,200.00***                $0.00***
Number:                           1                       1                       0
% of Pool:                    0.03%                    0.05%                   0.00%
(Dollars)
% of Pool:                    0.05%                    0.05%                   0.00%
(No. of Loans)


                          VII
                     Loans Acquired
                  --------------------

Dollar Amount:                $0.00***
Number:                           0
% of Pool:                     0.00%
(Dollars)
% of Pool:                     0.00%
(No. of Loans)

*  A Mortgage Loan is considered delinquent in a given month when a payment
due on the first day of the prior month has not been made on or before the
first day of such prior month.

**  Reflects the outstanding principal balance of the Mortgage Pool after the
application of all December 01, 2002 scheduled payments and November 01, 2002
unscheduled payments on the mortgage loans.

***  Reflects outstanding principal balance of delinquent mortgage loans as of
November 31, 2002.

Trading Factor, calculated as of distribution date : 0.87944308.
By multiplying this factor by the original balance of the Mortgage Pool as of
the Cut-Off Date, current outstanding balance of the Mortgage Pool (after
application of scheduled payments up to and including December 01, 2002, and
unscheduled prepayments in months prior to December ) can be calculated.