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United States

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2002

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
(Exact name of registrant as specified in its charter)

1201 THIRD AVENUE, WMT 1706
SEATTLE, WASHINGTON 98101
(206) 377-8555
(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Securities registered pursuant to Section 12(b) of the Act: None
Securities registered pursuant to Section 12(g) of the Act: None

        Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes [X] No [ ]

        Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. [ ] Not applicable.

        State the aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant: None.

        Indicate the number of shares outstanding of each of the registrant’s classes of common stock, as of the latest practicable date: Not applicable.

DOCUMENTS INCORPORATED BY REFERENCE

        The registrant’s Reports on Form 8-K concerning the registrant’s WaMu Mortgage Pass-Through Certificates, Series 2002-AR18 (“Certificates”) issued pursuant to the Pooling and Servicing Agreement dated as of January 1, 2002 (the “Pooling Agreement”) are incorporated by reference as set forth in Part IV, Item 15. Capitalized terms used herein but not otherwise defined shall have the meanings assigned to them in the Pooling Agreement.

Part I

Item 1. Business.

      Not applicable.

Item 2. Properties.

      Not applicable.

Item 3. Legal Proceedings.

        There are no material pending legal proceedings involving the mortgage loans related to the Certificates, the trustee under the Pooling Agreement or the registrant with respect to the mortgage loans, other than ordinary routine litigation incidental to the trustee’s or the registrant’s duties under the Pooling Agreement.

Item 4. Submission of Matters to a Vote of Security Holders.

        No vote or consent of holders of Certificates has been solicited for any purpose during 2002.

Part II

Item 5. Market for Registrant’s Common Equity and Related Stockholder Matters.

      Not applicable.

Item 6. Selected Financial Data.

      Not applicable.

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

      Not applicable.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

      Not applicable.

Item 8. Financial Statements and Supplementary Data.

      Not applicable.

Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

        No material disagreement concerning accounting procedures or change of accountants has occurred.

Part III

Item 10. Directors and Executive Officers of the Registrant.

      Not applicable.

Item 11. Executive Compensation.

      Not applicable.

Item 12. Security Ownership of Certain Beneficial Owners and Management.

      Not applicable.

Item 13. Certain Relationships and Related Transactions.

      Not applicable.

Item 14. Controls and Procedures.

      Not applicable.

Part IV

Item 15. Exhibits, Financial Statement Schedules, and Reports on Form 8-K.

        The Pooling Agreement requires an officer’s certificate to be delivered to the Trustee on or before April 30, 2003 stating as to the signer thereof, that (i) a review of the activities of the Master Servicer during the calendar year ended December 31, 2002 and performance under the Pooling Agreement has been made under such officer’s supervision, and (ii) to the best of such officer’s knowledge, based on such review, the Master Servicer has fulfilled all its obligations under the Pooling Agreement throughout such year, or if there has been a default in the fulfillment of any such obligation, specifying each such default known to such officer and the nature and status thereof. Such officer’s certificate dated as of March 21^st, 2003 is attached hereto as Exhibit 99.1.

        Attached hereto as Exhibit 99.2 is the Certification of Disclosure for this Form 10-K.

        The Pooling Agreement requires a statement from a firm of independent public accountants to be furnished to the Trustee on or before April 30, 2003, conducted in accordance with attestation standards established by the American Institute of Certified Public Accountants on the Master Servicer’s minimum servicing standards as a master servicer as of and for the year ended December 31, 2002. Such independent public accountant´s statement, dated February 20, 2003 is attached hereto as Exhibit 99.3. The management´s assetrtion concerning compliance with Washington Mutual Mortgage Securities Corp.’s minimum servicing standards referenced therein is attached hereto as Exhibit 99.4.

        The registrant filed Reports on Form 8-K that described distributions made to Certificateholders on the Distribution Date occurring in the month preceding the month in which such Report on Form 8-K was filed and also provided certain information regarding delinquent Mortgage Loans and credit enhancements as of such Distribution Date. Such Reports on Form 8-K are incorporated by reference as follows:

WaMu Mortgage Pass-Through Certificates, Series 2002-AR18

SIGNATURES

        Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Dated:       March 26, 2003

        Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By: /s/ Megan M. Davidson
- ----------------------------------------------------------------------------------
Megan M. Davidson, Senior Vice President and Director
Date: March 20, 2003

By: /s/ Craig S. Davis
- ----------------------------------------------------------------------------------
Craig S. Davis, Director
Date: March 21, 2003

By: /s/ Marangal I. Domingo
- ----------------------------------------------------------------------------------
Marangal I. Domingo, Chief Executive Officer and Director
Date: March 21, 2003

By: /s/ Michael J. Kula
- ----------------------------------------------------------------------------------
Michael J. Kula, Senior Vice President and Director
Date: March 21, 2003

By: /s/ Lehr Stuart
- ----------------------------------------------------------------------------------
Lehr Stuart, Director
Date: March 24, 2003

By: /s/ Robert H. Miles
- ----------------------------------------------------------------------------------
Robert H. Miles, Senior Vice President and Director
Date: March 21, 2003

By: /s/ Michael L. Parker
- ----------------------------------------------------------------------------------
Michael L. Parker, President and Director
Date: March 21, 2003

By: /s/ Marc K. Malone
- ----------------------------------------------------------------------------------
Marc K. Malone, First Vice President and Controller
Date: March 26, 2003

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
OFFICER’S CERTIFICATE

        The undersigned officer of Washington Mutual Mortgage Securities Corp., a Delaware corporation (the “Company”) hereby certifies on behalf of the Company and on his own behalf for purposes of the WaMu Mortgage Pass-Through Certificates, Series 2002-AR18, as follows:

        IN WITNESS WHEREOF, I have signed my name as of March 21^st, 2003.

Exhibit 99.2

WAMU MORTGAGE PASS-THROUGH CERTIFICATES,
SERIES 2002-AR18

        I, Michael L. Parker, a President and Director of Washington Mutual Mortgage Securities Corp., certify that:

    1.        I have reviewed this annual report on Form 10-K, and all reports on Form 8-K containing distribution or servicing reports filed in respect of periods included in the year covered by this annual report, of WaMu Mortgage Pass-Through Certificates, Series 2002-AR18;

    2.        Based on my knowledge, the information in these reports, taken as a whole, does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading as of the last day of the period covered by this annual report;

    3.        Based on my knowledge, the distribution or servicing information required to be provided to the trustee by the servicer under the pooling and servicing, or similar, agreement, for inclusion in these reports is included in these reports;

    4.        I am responsible for reviewing the activities performed by the servicer under the pooling and servicing, or similar, agreement and based upon my knowledge and the annual compliance review required under that agreement, and except as disclosed in the reports, the servicer has fulfilled its obligations under that agreement; and

    5.        The reports disclose all significant deficiencies relating to the servicer’s compliance with the minimum servicing standards based upon the report provided by an independent public accountant, after conducting a review in compliance with the Uniform Single Attestation Program for Mortgage Bankers or similar procedure, as set forth in the pooling and servicing, or similar, agreement, that is included in these reports.

        In giving the certifications above, I have reasonably relied on information provided to me by unaffiliated third parties acting as servicers and sub-servicers.

Dated: March 21^st, 2003

Exhibit 99.3

[LETTERHEAD OF DELOITTE & TOUCHE]

INDEPENDENT ACCOUNTANTS’ REPORT

Board of Directors and StockholderWashington
Mutual Mortgage Securities Corp.

We have examined management’s assertion, included in the accompanying Management’s Assertion Concerning Compliance with Washington Mutual Mortgage Securities Corp.‘s Minimum Servicing Standards, that Washington Mutual Mortgage Securities Corp. (WMMSC) complied with the minimum servicing standards in its role as Master Servicer as of and for the year ended December 31, 2002. Such assertions were examined relating to those series of certificates included in the attached Exhibit 1. Management is responsible for WMMSC’s compliance with those minimum servicing standards. Our responsibility is to express an opinion on management’s assertion about WMMSC’s compliance based on our examination.

Our examination was conducted in accordance with attestation standards established by the American Institute of Certified Public Accountants and, accordingly, included examining, on a test basis, evidence about WMMSC’s compliance with its minimum servicing standards and performing such other procedures as we considered necessary in the circumstances. Series of certificates subject to such procedures were selected using sampling methods, and accordingly, we make no representations that our examination procedures were performed on a specific series of certificates as listed in the attached Exhibit I. We believe that our examination provides a reasonable basis for our opinion. Our examination does not provide a legal determination on WMMSC’s compliance with its minimum servicing standards.

In our opinion, management’s assertion that WMMSC complied with the aforementioned minimum servicing standards as of and for the year ended December 31, 2002, is fairly stated, in all material respects.

/s/ Deloitte & Touche LLP

February 20, 2003

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.

Exhibit I

Exhibit 99.4

Management’s Assertion Concerning Compliance with Washington Mutual Mortgage Securities Corp.’s Minimum Servicing Standards

February 20, 2003

Deloitte & Touche LLP
700 Fifth Avenue
Suite 4500
Seattle, Washington 98104

For the year ended December 31, 2002, Washington Mutual Mortgage Securities Corp. (WMMSC) has complied in all material respects with our minimum servicing standards set forth below under master servicing arrangements. Primary servicing functions are performed by various subservicers.

Our minimum standards are:

I.     RECONCILIATIONS

A.     Reconciliations shall be prepared on a monthly basis for all clearing accounts. These reconciliations shall:

    1)        Be mathematically accurate.

    2)        Be prepared within forty-five (45) calendar days after each clearing account’s statement cutoff date.

    3)        Be reviewed and approved by someone other than the person who prepared the reconciliation, and document explanations for reconciling items.

B.     Reconciling items shall be resolved within ninety (90) calendar days of their original identification.

C.     Each clearing account shall be maintained as prescribed by applicable pooling and servicing agreements.

Exception — During the year, certain reconciliations were not completed within our minimum servicing standards and contained items that were not resolved within 90 calendar days of their original identification. These occurrences did not adversely impact trustees, paying agents, or investors. The reconciliation process has since been enhanced and the December 31, 2002 reconciliations were in compliance with the minimum servicing standards in all material respects.

II.     SUBSERVICER REMITTANCES

A.     Remittances for mortgage payments and payoffs received from subservicers shall be deposited into the applicable clearing account within one business day of receipt.

B.     Remittances from subservicers shall be reconciled to applicable loan records maintained by WMMSC during the appropriate accounting cycle.

C.     Reconciliations shall be performed monthly for each subservicer remittance. These reconciliations shall:

    1)        Be mathematically accurate.

    2)        Be prepared within thirty (30) calendar days after the cutoff date.

III.     DISBURSEMENTS

A.     Disbursements to trustees, paying agents, and investors shall be made in accordance with the applicable pooling and servicing agreements and/or the prospectus indicating how cash flows are to be allocated.

B.     Disbursements from the clearing accounts for amounts remitted to trustees, paying agents and investors, per our monthly reports to those entities, shall agree with the bank statements for the clearing accounts.

C.     Only permitted withdrawals, per our interpretation of the applicable pooling and servicing agreements, shall be made from the clearing accounts.

D.     Disbursements to trustees, paying agents and investors from clearing accounts, made via wire transfer, shall be made only by authorized personnel.

IV.     INVESTOR ACCOUNTING AND REPORTING

A.     Statements to the trustees, paying agents and investors shall be provided with each monthly distribution, in accordance with applicable pooling and servicing agreements, detailing the applicable distribution activity and effect on the unpaid principal balance of the mortgage loans.

V.     MORTGAGOR LOAN ACCOUNTING

A.     Loan records maintained by WMMSC shall agree with, or reconcile within material amounts to, the mortgage loan records maintained by the subservicer with respect to unpaid principal balance on a monthly basis.

VI.     DELIQUENCIES

A.     Reports from subservicers identifying delinquent loans shall be received and reviewed monthly. The number and aggregate principal balances of delinquent mortgage loans contained in these reports shall be included in our monthly statements to the trustees, paying agents and investors

VII.     INSURANCE POLICIES

As of and for this same period, Washington Mutual, Inc. (the ultimate parent of WMMSC) maintained a fidelity bond in the amount $110,000,000 and a mortgage impairment/mortgagees errors and omissions and professional liability insurance policy in the amount of $20,000,000.

/s/ Michael L. Parker
____________________________________
Michael L. Parker
President
Washington Mutual Mortgage Securities Corp.

/s/ Marangal I. Domingo
____________________________________
Marangal I. Domingo
Director and Chief Executive Officer
Washington Mutual Mortgage Securities Corp.