WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02S7
Distribution Date: 09/25/2003

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	Total Dist	Ending Class Bal
IA1	929227YB6	$100,000,000.00	$34,350,624.92	6.0000000000%	6.0000000000%	$171,753.12	$8,036,420.60	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$8,208,173.72	$26,314,204.32
IA2	929227YC4	$2,760,836.00	$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
IA3	929227YD2	$3,128,000.00	$3,287,966.32	6.0000000000%	6.0000000000%	$16,439.83	($16,439.83)	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$3,304,406.15
IA4	929227YE0	$12,080,000.00	$12,080,000.00	6.0000000000%	6.0000000000%	$60,400.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$60,400.00	$12,080,000.00
IIA1	929227YF7	$317,529,330.00	$116,564,726.56	5.5000000000%	5.5000000000%	$534,255.00	$23,531,092.51	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$24,065,347.51	$93,033,634.05
IIIA1	929227YG5	$45,033,647.00	$19,271,330.15	6.0000000000%	6.0000000000%	$96,356.65	$2,042,466.20	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,138,822.85	$17,228,863.95
IVA1	929227YH3	$144,525,028.00	$100,001,516.53	4.5000000000%	4.5000000000%	$375,005.69	$19,888,438.37	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$20,263,444.06	$80,113,078.16
IVA2	929227YJ9	$52,797,923.67	$36,532,582.00	6.0000000000%	6.0000000000%	$182,662.91	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$182,662.91	$29,266,932.13
IVA3	929227YK6	$19,981,000.00	$19,981,000.00	6.0000000000%	6.0000000000%	$99,905.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$99,905.00	$19,981,000.00
IVA4	929227YL4	$54,269,000.00	$54,269,000.00	6.0000000000%	6.0000000000%	$271,345.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$271,345.00	$54,269,000.00
IVA5	929227YM2	$118,604,840.00	$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
IVA6	929227YN0	$39,534,947.00	$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
IVA7	929227YP5	$28,000,000.00	$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
IVA8	929227YQ3	$23,750,000.00	$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
IVA9	929227YR1	$1,250,000.00	$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
IVA10	929227YS9	$100,000,000.00	$69,193,217.21	5.0000000000%	5.0000000000%	$288,305.07	$13,761,241.67	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$14,049,546.74	$55,431,975.54
IIP	929227YT7	$684,193.84	$441,027.69	0.0000000000%	0.0000000000%	$0.00	$12,384.18	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$12,384.18	$428,643.51
IVP	929227YU4	$1,059,149.34	$837,695.97	0.0000000000%	0.0000000000%	$0.00	$54,326.19	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$54,326.19	$783,369.78
B1	929227YV2	$11,402,000.00	$11,189,225.86	5.8455655922%	5.8455655922%	$54,506.13	$21,069.31	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$75,575.43	$11,168,156.55
B2	929227YW0	$5,182,000.00	$5,085,298.06	5.8455655922%	5.8455655922%	$24,772.04	$9,575.61	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$34,347.65	$5,075,722.45
B3	929227YX8	$3,110,000.00	$3,051,963.91	5.8455655922%	5.8455655922%	$14,867.05	$5,746.85	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$20,613.89	$3,046,217.06
B4	929227YZ3	$1,555,000.00	$1,525,981.94	5.8455655922%	5.8455655922%	$7,433.52	$2,873.42	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$10,306.95	$1,523,108.52
B5	929227ZA7	$1,555,000.00	$1,525,981.94	5.8455655922%	5.8455655922%	$7,433.52	$2,873.42	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$10,306.95	$1,523,108.52
B6	929227ZB5	$1,554,903.09	$1,525,886.85	5.8455655922%	5.8455655922%	$7,433.06	$2,873.23	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$10,306.29	$1,523,013.62
R	929227YY6	$100.00	$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
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
Total		$1,036,548,974.27	$454,182,443.91			$2,212,873.59	$67,354,941.72	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$69,567,815.31	$386,827,502.19

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02S7
Distribution Date: 09/25/2003

Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA1	$100,000,000.00	$34,350,624.92	$0.00	$0.00	$8,036,420.60	0.2631420432	$26,314,204.32
IA2	$2,760,836.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA3	$3,128,000.00	$3,287,966.32	$0.00	$0.00	($16,439.83)	1.0563958280	$3,304,406.15
IA4	$12,080,000.00	$12,080,000.00	$0.00	$0.00	$0.00	1.0000000000	$12,080,000.00
IIA1	$317,529,330.00	$116,564,726.56	$0.00	$0.00	$23,531,092.51	0.2929922538	$93,033,634.05
IIIA1	$45,033,647.00	$19,271,330.15	$0.00	$0.00	$2,042,466.20	0.3825775858	$17,228,863.95
IVA1	$144,525,028.00	$100,001,516.53	$0.00	$0.00	$19,888,438.37	0.5543197553	$80,113,078.16
IVA2	$52,797,923.67	$36,532,582.00	$0.00	$0.00	$0.00	0.5543197553	$29,266,932.13
IVA3	$19,981,000.00	$19,981,000.00	$0.00	$0.00	$0.00	1.0000000000	$19,981,000.00
IVA4	$54,269,000.00	$54,269,000.00	$0.00	$0.00	$0.00	1.0000000000	$54,269,000.00
IVA5	$118,604,840.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IVA6	$39,534,947.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IVA7	$28,000,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IVA8	$23,750,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IVA9	$1,250,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IVA10	$100,000,000.00	$69,193,217.21	$0.00	$0.00	$13,761,241.67	0.5543197554	$55,431,975.54
IIP	$684,193.84	$441,027.69	$0.00	$0.00	$12,384.18	0.6264942549	$428,643.51
IVP	$1,059,149.34	$837,695.97	$0.00	$0.00	$54,326.19	0.7396216477	$783,369.78
B1	$11,402,000.00	$11,189,225.86	$0.00	$0.00	$21,069.31	0.9794910147	$11,168,156.55
B2	$5,182,000.00	$5,085,298.06	$0.00	$0.00	$9,575.61	0.9794910170	$5,075,722.45
B3	$3,110,000.00	$3,051,963.91	$0.00	$0.00	$5,746.85	0.9794910161	$3,046,217.06
B4	$1,555,000.00	$1,525,981.94	$0.00	$0.00	$2,873.42	0.9794910096	$1,523,108.52
B5	$1,555,000.00	$1,525,981.94	$0.00	$0.00	$2,873.42	0.9794910096	$1,523,108.52
B6	$1,554,903.09	$1,525,886.85	$0.00	$0.00	$2,873.23	0.9794910241	$1,523,013.62
R	$100.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R_SYN	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
Total	$1,036,548,974.27	$454,182,443.91	$0.00	$0.00	$67,354,941.72	0.3731878684	$386,827,502.19

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02S7
Distribution Date: 09/25/2003
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA1	$100,000,000.00	343.50624920	0.00000000	0.00000000	80.36420600	0.2631420432	263.14204320
IA2	$2,760,836.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA3	$3,128,000.00	1,051.14012788	0.00000000	0.00000000	-5.25570013	1.0563958280	1,056.39582801
IA4	$12,080,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
IIA1	$317,529,330.00	367.09908518	0.00000000	0.00000000	74.10683136	0.2929922538	292.99225382
IIIA1	$45,033,647.00	427.93181174	0.00000000	0.00000000	45.35422592	0.3825775858	382.57758582
IVA1	$144,525,028.00	691.93217198	0.00000000	0.00000000	137.61241665	0.5543197553	554.31975533
IVA2	$52,797,923.67	691.93217196	0.00000000	0.00000000	0.00000000	0.5543197553	554.31975532
IVA3	$19,981,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
IVA4	$54,269,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
IVA5	$118,604,840.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IVA6	$39,534,947.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IVA7	$28,000,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IVA8	$23,750,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IVA9	$1,250,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IVA10	$100,000,000.00	691.93217210	0.00000000	0.00000000	137.61241670	0.5543197554	554.31975540
IIP	$684,193.84	644.59465171	0.00000000	0.00000000	18.10039681	0.6264942549	626.49425490
IVP	$1,059,149.34	790.91393287	0.00000000	0.00000000	51.29228518	0.7396216477	739.62164769
B1	$11,402,000.00	981.33887564	0.00000000	0.00000000	1.84786090	0.9794910147	979.49101473
B2	$5,182,000.00	981.33887688	0.00000000	0.00000000	1.84785990	0.9794910170	979.49101698
B3	$3,110,000.00	981.33887781	0.00000000	0.00000000	1.84786174	0.9794910161	979.49101608
B4	$1,555,000.00	981.33886817	0.00000000	0.00000000	1.84785852	0.9794910096	979.49100965
B5	$1,555,000.00	981.33886817	0.00000000	0.00000000	1.84785852	0.9794910096	979.49100965
B6	$1,554,903.09	981.33887560	0.00000000	0.00000000	1.84785150	0.9794910241	979.49102410
R	$100.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R_SYN	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02S7
Distribution Date: 09/25/2003

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
IA1	$100,000,000.00	6.0000000000%	6.0000000000%	$34,350,624.92	$171,753.12	$0.00	$0.00	$0.00	$171,753.12
IA2	$2,760,836.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA3	$3,128,000.00	6.0000000000%	6.0000000000%	$3,287,966.32	$16,439.83	$0.00	$0.00	$0.00	$16,439.83
IA4	$12,080,000.00	6.0000000000%	6.0000000000%	$12,080,000.00	$60,400.00	$0.00	$0.00	$0.00	$60,400.00
IIA1	$317,529,330.00	5.5000000000%	5.5000000000%	$116,564,726.56	$534,255.00	$0.00	$0.00	$0.00	$534,255.00
IIIA1	$45,033,647.00	6.0000000000%	6.0000000000%	$19,271,330.15	$96,356.65	$0.00	$0.00	$0.00	$96,356.65
IVA1	$144,525,028.00	4.5000000000%	4.5000000000%	$100,001,516.53	$375,005.69	$0.00	$0.00	$0.00	$375,005.69
IVA2	$52,797,923.67	6.0000000000%	6.0000000000%	$36,532,582.00	$182,662.91	$0.00	$0.00	$0.00	$182,662.91
IVA3	$19,981,000.00	6.0000000000%	6.0000000000%	$19,981,000.00	$99,905.00	$0.00	$0.00	$0.00	$99,905.00
IVA4	$54,269,000.00	6.0000000000%	6.0000000000%	$54,269,000.00	$271,345.00	$0.00	$0.00	$0.00	$271,345.00
IVA5	$118,604,840.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IVA6	$39,534,947.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IVA7	$28,000,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IVA8	$23,750,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IVA9	$1,250,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IVA10	$100,000,000.00	5.0000000000%	5.0000000000%	$69,193,217.21	$288,305.07	$0.00	$0.00	$0.00	$288,305.07
IIP	$684,193.84	0.0000000000%	0.0000000000%	$441,027.69	$0.00	$0.00	$0.00	$0.00	$0.00
IVP	$1,059,149.34	0.0000000000%	0.0000000000%	$837,695.97	$0.00	$0.00	$0.00	$0.00	$0.00
B1	$11,402,000.00	5.8455655922%	5.8455655922%	$11,189,225.86	$54,506.13	$0.00	$0.00	$0.00	$54,506.13
B2	$5,182,000.00	5.8455655922%	5.8455655922%	$5,085,298.06	$24,772.04	$0.00	$0.00	$0.00	$24,772.04
B3	$3,110,000.00	5.8455655922%	5.8455655922%	$3,051,963.91	$14,867.05	$0.00	$0.00	$0.00	$14,867.05
B4	$1,555,000.00	5.8455655922%	5.8455655922%	$1,525,981.94	$7,433.52	$0.00	$0.00	$0.00	$7,433.52
B5	$1,555,000.00	5.8455655922%	5.8455655922%	$1,525,981.94	$7,433.52	$0.00	$0.00	$0.00	$7,433.52
B6	$1,554,903.09	5.8455655922%	5.8455655922%	$1,525,886.85	$7,433.06	$0.00	$0.00	$0.00	$7,433.06
R	$100.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total	$1,036,548,974.27			$454,182,443.91	$2,212,873.59	$0.00	$0.00	$0.00	$2,212,873.59

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02S7
Distribution Date: 09/25/2003
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
IA1	$100,000,000.00	6.0000000000%	6.0000000000%	343.50624920	1.71753120	0.00000000	0.00000000	0.00000000	1.71753120
IA2	$2,760,836.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA3	$3,128,000.00	6.0000000000%	6.0000000000%	1,051.14012788	5.25570013	0.00000000	0.00000000	0.00000000	5.25570013
IA4	$12,080,000.00	6.0000000000%	6.0000000000%	1,000.00000000	5.00000000	0.00000000	0.00000000	0.00000000	5.00000000
IIA1	$317,529,330.00	5.5000000000%	5.5000000000%	367.09908518	1.68253748	0.00000000	0.00000000	0.00000000	1.68253748
IIIA1	$45,033,647.00	6.0000000000%	6.0000000000%	427.93181174	2.13965904	0.00000000	0.00000000	0.00000000	2.13965904
IVA1	$144,525,028.00	4.5000000000%	4.5000000000%	691.93217198	2.59474567	0.00000000	0.00000000	0.00000000	2.59474567
IVA2	$52,797,923.67	6.0000000000%	6.0000000000%	691.93217196	3.45966086	0.00000000	0.00000000	0.00000000	3.45966086
IVA3	$19,981,000.00	6.0000000000%	6.0000000000%	1,000.00000000	5.00000000	0.00000000	0.00000000	0.00000000	5.00000000
IVA4	$54,269,000.00	6.0000000000%	6.0000000000%	1,000.00000000	5.00000000	0.00000000	0.00000000	0.00000000	5.00000000
IVA5	$118,604,840.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IVA6	$39,534,947.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IVA7	$28,000,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IVA8	$23,750,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IVA9	$1,250,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IVA10	$100,000,000.00	5.0000000000%	5.0000000000%	691.93217210	2.88305070	0.00000000	0.00000000	0.00000000	2.88305070
IIP	$684,193.84	0.0000000000%	0.0000000000%	644.59465171	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IVP	$1,059,149.34	0.0000000000%	0.0000000000%	790.91393287	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
B1	$11,402,000.00	5.8455655922%	5.8455655922%	981.33887564	4.78040081	0.00000000	0.00000000	0.00000000	4.78040081
B2	$5,182,000.00	5.8455655922%	5.8455655922%	981.33887688	4.78040139	0.00000000	0.00000000	0.00000000	4.78040139
B3	$3,110,000.00	5.8455655922%	5.8455655922%	981.33887781	4.78040193	0.00000000	0.00000000	0.00000000	4.78040193
B4	$1,555,000.00	5.8455655922%	5.8455655922%	981.33886817	4.78039871	0.00000000	0.00000000	0.00000000	4.78039871
B5	$1,555,000.00	5.8455655922%	5.8455655922%	981.33886817	4.78039871	0.00000000	0.00000000	0.00000000	4.78039871
B6	$1,554,903.09	5.8455655922%	5.8455655922%	981.33887560	4.78040082	0.00000000	0.00000000	0.00000000	4.78040082
R	$100.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
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
09/2003 DISTRIBUTION REPORT
SERIES: WAMU 02S7 WEIGHTED AVERAGE PC RATE: 5.84666%
POOL NUMBER: Group 1(1960,1961,1962,1963)
ISSUE DATE: 10/28/2002
CERTIFICATE BALANCE AT ISSUE: $1,036,548,974.27
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	1011		$454,182,443.93
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$809,542.93
Unscheduled Principal Collection/Reversals		$115,033.87
Liquidations-in-full	147	$66,430,364.94
Net principal Distributed		$67,354,941.74	-$67,354,941.74

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	864		$386,827,502.19

SCHEDULED INTEREST AT MORTGAGE RATE:		$2,432,065.81

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

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$219,192.24

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:		$69,567,815.31

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2003 DISTRIBUTION REPORT
SERIES: WAMU 02S7 WEIGHTED AVERAGE PC RATE: 6.00000%
POOL NUMBER: 1960
ISSUE DATE: 10/28/2002
CERTIFICATE BALANCE AT ISSUE: $120,807,820.67
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	119		$52,507,880.65
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$51,759.53
Unscheduled Principal Collection/Reversals		$17,004.78
Liquidations-in-full	17	$7,953,965.99
Net principal Distributed		$8,022,730.30	-$8,022,730.30

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	102		$44,485,150.35

SCHEDULED INTEREST AT MORTGAGE RATE:		$292,903.29

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

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$30,363.89

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:		$8,285,269.70

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2003 DISTRIBUTION REPORT
SERIES: WAMU 02S7 WEIGHTED AVERAGE PC RATE: 5.48050%
POOL NUMBER: 1961
ISSUE DATE: 10/28/2002
CERTIFICATE BALANCE AT ISSUE: $325,871,504.71
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	265		$124,389,059.00
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$483,129.00
Unscheduled Principal Collection/Reversals		$39,678.84
Liquidations-in-full	48	$23,049,342.88
Net principal Distributed		$23,572,150.72	-$23,572,150.72

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	217		$100,816,908.28

SCHEDULED INTEREST AT MORTGAGE RATE:		$627,688.93

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

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$59,593.82

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:		$24,140,245.83

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2003 DISTRIBUTION REPORT
SERIES: WAMU 02S7 WEIGHTED AVERAGE PC RATE: 6.00000%
POOL NUMBER: 1962
ISSUE DATE: 10/28/2002
CERTIFICATE BALANCE AT ISSUE: $46,117,508.62
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	40		$20,345,731.51
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$18,332.52
Unscheduled Principal Collection/Reversals		$391.74
Liquidations-in-full	5	$2,024,710.03
Net principal Distributed		$2,043,434.29	-$2,043,434.29

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	35		$18,302,297.22

SCHEDULED INTEREST AT MORTGAGE RATE:		$117,604.16

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

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$15,875.52

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:		$2,145,162.93

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2003 DISTRIBUTION REPORT
SERIES: WAMU 02S7 WEIGHTED AVERAGE PC RATE: 5.98044%
POOL NUMBER: 1963
ISSUE DATE: 10/28/2002
CERTIFICATE BALANCE AT ISSUE: $543,752,140.27
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	587		$256,939,772.77
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$256,321.88
Unscheduled Principal Collection/Reversals		$57,958.51
Liquidations-in-full	77	$33,402,346.04
Net principal Distributed		$33,716,626.43	-$33,716,626.43

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	510		$223,223,146.34

SCHEDULED INTEREST AT MORTGAGE RATE:		$1,393,869.43

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

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$113,359.01

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:		$34,997,136.85

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2003 DISTRIBUTION REPORT
SERIES: WAMU 02S7 WEIGHTED AVERAGE PC RATE: 5.84666%
POOL NUMBER: ALL
ISSUE DATE: 10/28/2002
CERTIFICATE BALANCE AT ISSUE: $1,036,548,974.27
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	1011		$454,182,443.93
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$809,542.93
Unscheduled Principal Collection/Reversals		$115,033.87
Liquidations-in-full	147	$66,430,364.94
Net principal Distributed		$67,354,941.74	-$67,354,941.74

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	864		$386,827,502.19

SCHEDULED INTEREST AT MORTGAGE RATE:		$2,432,065.81

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

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
09/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$219,192.24

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:		$69,567,815.31

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02S7
Distribution Date: 09/25/2003

Distribution by Group
Pool ID		Principal		Interest		Total
Group 1(1960,1961,1962,1963)		$67,354,941.74		$2,212,873.57		$69,567,815.31
Pool - 1960		$8,022,730.30		$262,539.40		$8,285,269.70
Pool - 1961		$23,572,150.72		$568,095.11		$24,140,245.83
Pool - 1962		$2,043,434.29		$101,728.64		$2,145,162.93
Pool - 1963		$33,716,626.43		$1,280,510.42		$34,997,136.85
Aggregate		$67,354,941.74		$2,212,873.57		$69,567,815.31

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
Group 1(1960,1961,1962,1963)	$454,182,443.93	1011	147	864	$386,827,502.19	$809,542.93	$66,430,364.94	$115,033.87	$67,354,941.74
Pool - 1960	$52,507,880.65	119	17	102	$44,485,150.35	$51,759.53	$7,953,965.99	$17,004.78	$8,022,730.30
Pool - 1961	$124,389,059.00	265	48	217	$100,816,908.28	$483,129.00	$23,049,342.88	$39,678.84	$23,572,150.72
Pool - 1962	$20,345,731.51	40	5	35	$18,302,297.22	$18,332.52	$2,024,710.03	$391.74	$2,043,434.29
Pool - 1963	$256,939,772.77	587	77	510	$223,223,146.34	$256,321.88	$33,402,346.04	$57,958.51	$33,716,626.43
Aggregate	$454,182,443.93	1011	147	864	$386,827,502.19	$809,542.93	$66,430,364.94	$115,033.87	$67,354,941.74

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
Group 1(1960,1961,1962,1963)	5	$2,874,503.20	0	$0.00	0	$0.00	0	$0.00
Pool - 1960	1	$318,747.60	0	$0.00	0	$0.00	0	$0.00
Pool - 1961	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Pool - 1962	1	$1,287,636.19	0	$0.00	0	$0.00	0	$0.00
Pool - 1963	3	$1,268,119.41	0	$0.00	0	$0.00	0	$0.00
Aggregate	5	$2,874,503.20	0	$0.00	0	$0.00	0	$0.00

Foreclosure and REO Information by Group
Pool ID		Foreclosure Count		Sched End Balance		REO Count		Sched End Balance
Group 1(1960,1961,1962,1963)		0		$0.00		0		$0.00
Pool - 1960		0		$0.00		0		$0.00
Pool - 1961		0		$0.00		0		$0.00
Pool - 1962		0		$0.00		0		$0.00
Pool - 1963		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(1960,1961,1962,1963)			0			$0.00
Aggregate			0			$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02S7
Distribution Date: 09/25/2003

INSURANCE RESERVES - Group 1(1960,1961,1962,1963)
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	$10,365,489.00	$0.00	$0.00	$0.00	$10,365,489.00
Bankruptcy Bond
Single-Units	$158,470.00	$0.00	$0.00	$0.00	$158,470.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$10,365,489.00	$0.00	$0.00	$0.00	$10,365,489.00

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	$10,365,489.00	$0.00	$0.00	$0.00	$10,365,489.00
Bankruptcy Bond
Single-Units	$158,470.00	$0.00	$0.00	$0.00	$158,470.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$10,365,489.00	$0.00	$0.00	$0.00	$10,365,489.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.02S7
Distribution Date: 09/25/2003

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 Group I, II, III and Group IV Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated October 29, 2002 to that certain Prospectus Supplement, dated September 19, 2002, to which certain of the Group I, II, III and Group IV certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Group I, II, III and Group IV 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 200309 are as follows:

Class			Class Principal Balance
B1			$11,168,156.55
B2			$5,075,722.45
B3			$3,046,217.06
B4			$1,523,108.52
B5			$1,523,108.52
B6			$1,523,013.62
Total			$23,859,326.72
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 $10,365,489.00, $158,470.00, $10,365,489.00 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."

WAMU MORTGAGE PASS THROUGH CERTIFICATES 2002-S7 8-K