WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02AR18
Distribution Date: 12/26/2003

Class	Cusip	Orig Prin Bal	Begin Prin Bal	Int Rate Accrued	Int Rate Paid	Int Dist	Prin Dist	Int Shortfall	Prin Loss	Deferred Interest	Int Reimbursed	Unscheduled Int	Prin Reimbursed	Subsequent Recoveries	Total Dist	Ending Class Bal
A	929227ZC3	$1,940,090,300.00	$929,865,360.44	4.1845633370%	4.1845633370%	$3,242,567.08	$28,448,266.04	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$31,690,833.12	$901,417,094.40
X	929227ZD1	$1,940,090,300.00	$929,865,360.44	0.6530000000%	0.6530000000%	$506,001.73	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$506,001.73	$901,417,094.40
B1	929227ZE9	$20,957,800.00	$20,856,868.87	4.8375633370%	4.8375633370%	$84,080.35	$312,904.81	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$396,985.16	$20,543,964.06
B2	929227ZF6	$15,967,800.00	$15,890,900.34	4.8375633370%	4.8375633370%	$64,061.03	$238,402.95	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$302,463.98	$15,652,497.39
B3	929227ZG4	$7,984,000.00	$7,945,549.67	4.8375633370%	4.8375633370%	$32,030.92	$119,202.97	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$151,233.88	$7,826,346.70
B4	929227ZJ8	$2,993,900.00	$2,979,481.61	4.8375633370%	4.8375633370%	$12,011.19	$44,699.62	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$56,710.81	$2,934,781.99
B5	929227ZK5	$2,994,000.00	$2,979,581.13	4.8375633370%	4.8375633370%	$12,011.59	$44,701.11	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$56,712.71	$2,934,880.02
B6	929227ZL3	$4,989,978.00	$4,965,946.66	4.8375633370%	4.8375633370%	$20,019.23	$74,501.53	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$94,520.76	$4,891,445.13
R	929227ZH2	$100.00	$0.00	0.0000000000%	0.0000000000%	$0.53	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.53	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total		$1,995,977,878.00	$985,483,688.72			$3,972,783.66	$29,282,679.02	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$33,255,462.68	$956,201,009.70

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02AR18
Distribution Date: 12/26/2003

Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
A	$1,940,090,300.00	$929,865,360.44	$0.00	$0.00	$0.00	$0.00	$28,448,266.04	0.4646263601	$901,417,094.40
X	$1,940,090,300.00	$929,865,360.44	$0.00	$0.00	$0.00	$0.00	$0.00	0.4646263601	$901,417,094.40
B1	$20,957,800.00	$20,856,868.87	$0.00	$0.00	$0.00	$0.00	$312,904.81	0.9802538463	$20,543,964.06
B2	$15,967,800.00	$15,890,900.34	$0.00	$0.00	$0.00	$0.00	$238,402.95	0.9802538477	$15,652,497.39
B3	$7,984,000.00	$7,945,549.67	$0.00	$0.00	$0.00	$0.00	$119,202.97	0.9802538452	$7,826,346.70
B4	$2,993,900.00	$2,979,481.61	$0.00	$0.00	$0.00	$0.00	$44,699.62	0.9802538462	$2,934,781.99
B5	$2,994,000.00	$2,979,581.13	$0.00	$0.00	$0.00	$0.00	$44,701.11	0.9802538477	$2,934,880.02
B6	$4,989,978.00	$4,965,946.66	$0.00	$0.00	$0.00	$0.00	$74,501.53	0.9802538468	$4,891,445.13
R	$100.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R_SYN	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
Total	$1,995,977,878.00	$985,483,688.72	$0.00	$0.00	$0.00	$0.00	$29,282,679.02	0.4790639316	$956,201,009.70

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02AR18
Distribution Date: 12/26/2003
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
A	$1,940,090,300.00	479.28973226	0.00000000	0.00000000	0.00000000	0.00000000	14.66337213	0.4646263601	464.62636012
X	$1,940,090,300.00	479.28973226	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.4646263601	464.62636012
B1	$20,957,800.00	995.18407800	0.00000000	0.00000000	0.00000000	0.00000000	14.93023170	0.9802538463	980.25384630
B2	$15,967,800.00	995.18407921	0.00000000	0.00000000	0.00000000	0.00000000	14.93023147	0.9802538477	980.25384774
B3	$7,984,000.00	995.18407690	0.00000000	0.00000000	0.00000000	0.00000000	14.93023171	0.9802538452	980.25384519
B4	$2,993,900.00	995.18407762	0.00000000	0.00000000	0.00000000	0.00000000	14.93023147	0.9802538462	980.25384615
B5	$2,994,000.00	995.18407816	0.00000000	0.00000000	0.00000000	0.00000000	14.93023046	0.9802538477	980.25384770
B6	$4,989,978.00	995.18407897	0.00000000	0.00000000	0.00000000	0.00000000	14.93023216	0.9802538468	980.25384681
R	$100.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R_SYN	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02AR18
Distribution Date: 12/26/2003

Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
A	$1,940,090,300.00	4.1845633370%	4.1845633370%	$929,865,360.44	$3,242,567.08	$0.00	$0.00	$0.00	$3,242,567.08
X	$1,940,090,300.00	0.6530000000%	0.6530000000%	$929,865,360.44	$506,001.73	$0.00	$0.00	$0.00	$506,001.73
B1	$20,957,800.00	4.8375633370%	4.8375633370%	$20,856,868.87	$84,080.35	$0.00	$0.00	$0.00	$84,080.35
B2	$15,967,800.00	4.8375633370%	4.8375633370%	$15,890,900.34	$64,061.03	$0.00	$0.00	$0.00	$64,061.03
B3	$7,984,000.00	4.8375633370%	4.8375633370%	$7,945,549.67	$32,030.92	$0.00	$0.00	$0.00	$32,030.92
B4	$2,993,900.00	4.8375633370%	4.8375633370%	$2,979,481.61	$12,011.19	$0.00	$0.00	$0.00	$12,011.19
B5	$2,994,000.00	4.8375633370%	4.8375633370%	$2,979,581.13	$12,011.59	$0.00	$0.00	$0.00	$12,011.59
B6	$4,989,978.00	4.8375633370%	4.8375633370%	$4,965,946.66	$20,019.23	$0.00	$0.00	$0.00	$20,019.23
R	$100.00	0.0000000000%	0.0000000000%	$0.00	$0.53	$0.00	$0.00	$0.00	$0.53
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total	$1,995,977,878.00			$985,483,688.72	$3,972,783.66	$0.00	$0.00	$0.00	$3,972,783.66

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02AR18
Distribution Date: 12/26/2003
PER $1000 DENOMINATION
Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
A	$1,940,090,300.00	4.1845633370%	4.1845633370%	479.28973226	1.67134853	0.00000000	0.00000000	0.00000000	1.67134853
X	$1,940,090,300.00	0.6530000000%	0.6530000000%	479.28973226	0.26081349	0.00000000	0.00000000	0.00000000	0.26081349
B1	$20,957,800.00	4.8375633370%	4.8375633370%	995.18407800	4.01188818	0.00000000	0.00000000	0.00000000	4.01188818
B2	$15,967,800.00	4.8375633370%	4.8375633370%	995.18407921	4.01188830	0.00000000	0.00000000	0.00000000	4.01188830
B3	$7,984,000.00	4.8375633370%	4.8375633370%	995.18407690	4.01188878	0.00000000	0.00000000	0.00000000	4.01188878
B4	$2,993,900.00	4.8375633370%	4.8375633370%	995.18407762	4.01188750	0.00000000	0.00000000	0.00000000	4.01188750
B5	$2,994,000.00	4.8375633370%	4.8375633370%	995.18407816	4.01188711	0.00000000	0.00000000	0.00000000	4.01188711
B6	$4,989,978.00	4.8375633370%	4.8375633370%	995.18407897	4.01188743	0.00000000	0.00000000	0.00000000	4.01188743
R	$100.00	0.0000000000%	0.0000000000%	0.00000000	5.30000000	0.00000000	0.00000000	0.00000000	5.30000000
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMU 02AR18
WEIGHTED AVERAGE PC RATE: 4.83756%
WEIGHTED AVERAGE MATURITY: 222.18222
WEIGHTED AVERAGE LOAN AGE: 13.19341
POOL NUMBER: 1981
ISSUE DATE: 11/29/2002
CERTIFICATE BALANCE AT ISSUE: $1,995,977,878.46
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	1714		$985,483,689.18
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$286,724.13
Unscheduled Principal Collection/Reversals		$804,808.79
Liquidations-in-full	46	$28,191,146.10
Subsequent Recoveries		$0.00
Net principal Distributed		$29,282,679.02	-$29,282,679.02

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1668		$956,201,010.16

SCHEDULED INTEREST AT MORTGAGE RATE:		$4,321,809.15

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
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$349,025.49

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:		$33,255,462.68

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WAMU 02AR18
WEIGHTED AVERAGE PC RATE: 4.83756%
WEIGHTED AVERAGE MATURITY: 222.18222
WEIGHTED AVERAGE LOAN AGE: 13.19341
POOL NUMBER: ALL
ISSUE DATE: 11/29/2002
CERTIFICATE BALANCE AT ISSUE: $1,995,977,878.46
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	1714		$985,483,689.18
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$286,724.13
Unscheduled Principal Collection/Reversals		$804,808.79
Liquidations-in-full	46	$28,191,146.10
Subsequent Recoveries		$0.00
Net principal Distributed		$29,282,679.02	-$29,282,679.02

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	1668		$956,201,010.16

SCHEDULED INTEREST AT MORTGAGE RATE:		$4,321,809.15

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
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$349,025.49

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:		$33,255,462.68

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02AR18
Distribution Date: 12/26/2003

Distribution by Group
Pool ID		Principal		Interest		Total
Pool - 1981		$29,282,679.02		$3,972,783.66		$33,255,462.68
Aggregate		$29,282,679.02		$3,972,783.66		$33,255,462.68

Number of Loans and Aggregate Principal Balance By Group
Pool ID	Beg Bal	Beg Count	Paid Off / Liq Count	Rem Count	Sched Prin End Bal	Sched Prin	Prin PrePay / Liq	Unsched Prin / Rev	Total Prin
Pool - 1981	$985,483,689.18	1714	46	1668	$956,201,010.16	$286,724.13	$28,191,146.10	$804,808.79	$29,282,679.02
Aggregate	$985,483,689.18	1714	46	1668	$956,201,010.16	$286,724.13	$28,191,146.10	$804,808.79	$29,282,679.02

Delinquency Information by Group
Pool ID	1 Month Count	Sched End Balance	2 Months Count	Sched End Balance	3 Months Count	Sched End Balance	4 Months Count	Sched End Balance
Pool - 1981	11	$6,021,660.11	1	$910,000.00	1	$354,823.08	0	$0.00
Aggregate	11	$6,021,660.11	1	$910,000.00	1	$354,823.08	0	$0.00

Foreclosure and REO Information by Group
Pool ID		Foreclosure Count		Sched End Balance		REO Count		Sched End Balance
Pool - 1981		0		$0.00		0		$0.00
Aggregate		0		$0.00		0		$0.00

Aggregate Loss Amounts by Group
Pool ID			Count			Loss Amount
Group 1(1981)			0			$0.00
Aggregate			0			$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02AR18
Distribution Date: 12/26/2003

INSURANCE RESERVES - Group 1(1981)
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$33,568,270.00	$0.00	$0.00	$0.00	$33,568,270.00
Bankruptcy Bond
Single-Units	$201,433.00	$0.00	$0.00	$0.00	$201,433.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$39,919,557.00	$0.00	$0.00	$0.00	$39,919,557.00

INSURANCE RESERVES - Aggregate
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$33,568,270.00	$0.00	$0.00	$0.00	$33,568,270.00
Bankruptcy Bond
Single-Units	$201,433.00	$0.00	$0.00	$0.00	$201,433.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$39,919,557.00	$0.00	$0.00	$0.00	$39,919,557.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02AR18
Distribution Date: 12/26/2003

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated November 21, 2002 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.



The Class Principal Balances of each Class of the Class B1,B2,B3,B4,B5,B6 Certificatesimmediately after the principal and interest distribution on 200312 are as follows:

Class			Class Principal Balance
B1			$20,543,964.06
B2			$15,652,497.39
B3			$7,826,346.70
B4			$2,934,781.99
B5			$2,934,880.02
B6			$4,891,445.13
Total			$54,783,915.30
Capitalized items used but not defined herein have the meanings ascribed to them in the Prospectus Supplement.
The amount of the special hazard coverage, bankruptcy coverage, and fraud coverage, as of the above referenced distribution date, is $33,568,270.00, $201,433.00, $39,919,557.00 respectively, and such coverages are referred to in the table above under the column "Insurance Type" as "special hazard," "bankruptcy bond," and "mortgage repurchase," respectively. However, no policy of insurance exists for any such coverage, notwithstanding the reference to "insurance."

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02AR18
Distribution Date: 12/26/2003

Aggregate ARM Information by Group
Pool ID	Netwac	Margin
Pool - 1981	4.83756%	2.32502%
Aggregate	4.83756%	2.32502%

WASHINGTON MUTUAL MORT SEC CORP WAMU MO PA TH CER SE 02 AR18 8-K