WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.02MS10
Distribution Date: 08/25/2003

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	939336LA9	$24,277,000.00	$10,755,110.11	5.0000000000%	5.0000000000%	$44,812.96	$2,674,264.84	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,719,077.80	$8,080,845.27
IA2	939336LB7	$6,621,000.00	$2,933,211.86	1.6750000000%	1.6750000000%	$4,094.27	$729,344.96	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$733,439.23	$2,203,866.90
IA3	939336LC5	$6,621,000.00	$2,933,211.86	6.8250000000%	6.8250000000%	$16,682.64	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$16,682.64	$2,203,866.90
IA4	939336LD3	$14,857,000.00	$14,857,000.00	5.5000000000%	5.5000000000%	$68,094.58	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$68,094.58	$14,857,000.00
IA5	939336LE1	$5,827,000.00	$5,827,000.00	5.7500000000%	5.7500000000%	$27,921.04	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$27,921.04	$5,827,000.00
IA6	939336LF8	$111,493,000.00	$48,629,607.45	5.7500000000%	5.7500000000%	$233,016.87	$12,432,682.25	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$12,665,699.12	$36,196,925.20
IA7	939336LG6	$15,573,000.00	$15,573,000.00	5.7500000000%	5.7500000000%	$74,620.63	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$74,620.63	$15,573,000.00
IA8	939336LH4	$2,000,000.00	$2,000,000.00	5.5000000000%	5.5000000000%	$9,166.67	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$9,166.67	$2,000,000.00
IA9	939336LJ0	$2,000,000.00	$2,000,000.00	5.5000000000%	5.5000000000%	$9,166.67	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$9,166.67	$2,000,000.00
IA10	939336LK7	$2,000,000.00	$2,000,000.00	5.5000000000%	5.5000000000%	$9,166.67	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$9,166.67	$2,000,000.00
IA11	939336LL5	$2,000,000.00	$2,000,000.00	5.5000000000%	5.5000000000%	$9,166.67	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$9,166.67	$2,000,000.00
IA12	939336LM3	$2,000,000.00	$2,000,000.00	5.5000000000%	5.5000000000%	$9,166.67	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$9,166.67	$2,000,000.00
IA13	939336LN1	$434,782.00	$434,782.61	5.7500000000%	5.7500000000%	$2,083.33	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,083.33	$434,782.61
IA14	939336LP6	$4,942,895.00	$4,942,895.00	5.7500000000%	5.7500000000%	$23,684.71	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$23,684.71	$4,942,895.00
IA15	939336LQ4	$645,956.00	$645,956.52	5.7500000000%	5.7500000000%	$3,095.21	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$3,095.21	$645,956.52
IIA1	939336LR2	$148,721,845.00	$93,062,869.27	5.2500000000%	5.2500000000%	$407,150.05	$10,776,647.72	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$11,183,797.77	$82,286,221.55
IIA2	939336LS0	$20,280,251.00	$12,690,390.89	5.5000000000%	5.5000000000%	$58,164.29	$1,469,542.83	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,527,707.12	$11,220,848.06
IX	939336LT8	$2,384,712.00	$1,604,005.77	5.7500000000%	5.7500000000%	$7,685.86	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$7,685.86	$1,520,455.12
IIX	939336LU5	$3,890,712.00	$1,904,384.89	5.2800000000%	5.2800000000%	$8,379.29	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$8,379.29	$1,651,849.85
IP	939336LV3	$371,749.74	$353,825.86	0.0000000000%	0.0000000000%	$0.00	$29,863.34	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$29,863.34	$323,962.52
IIP	939336LW1	$220,892.47	$180,177.99	0.0000000000%	0.0000000000%	$0.00	$11,671.93	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$11,671.93	$168,506.06
CB1	939336LX9	$3,897,242.00	$3,837,597.54	5.5331917527%	5.5331917527%	$17,695.14	$8,806.23	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$26,501.36	$3,828,791.31
CB2	939336LY7	$1,855,828.00	$1,827,425.90	5.5331917527%	5.5331917527%	$8,426.25	$4,193.44	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$12,619.69	$1,823,232.46
CB3	939336LZ4	$742,331.00	$730,970.16	5.5331917527%	5.5331917527%	$3,370.50	$1,677.37	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$5,047.87	$729,292.79
CB4	939336MB6	$556,748.00	$548,227.38	5.5331917527%	5.5331917527%	$2,527.87	$1,258.03	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$3,785.90	$546,969.35
CB5	939336MC4	$371,165.00	$365,484.59	5.5331917527%	5.5331917527%	$1,685.25	$838.69	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$2,523.93	$364,645.90
CB6	939336MD2	$556,751.83	$548,231.14	5.5331917527%	5.5331917527%	$2,527.89	$1,257.99	$0.00	$0.06	$0.00	$0.00	$0.00	$0.00	$3,785.88	$546,973.09
R	939336MA8	$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		$371,165,799.04	$227,663,025.14			$1,061,551.97	$28,142,049.61	$0.00	$0.06	$0.00	$0.00	$0.00	$0.00	$29,203,601.58	$199,520,975.47

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.02MS10
Distribution Date: 08/25/2003

Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA1	$24,277,000.00	$10,755,110.11	$0.00	$0.00	$2,674,264.84	0.3328601256	$8,080,845.27
IA2	$6,621,000.00	$2,933,211.86	$0.00	$0.00	$729,344.96	0.3328601269	$2,203,866.90
IA3	$6,621,000.00	$2,933,211.86	$0.00	$0.00	$0.00	0.3328601269	$2,203,866.90
IA4	$14,857,000.00	$14,857,000.00	$0.00	$0.00	$0.00	1.0000000000	$14,857,000.00
IA5	$5,827,000.00	$5,827,000.00	$0.00	$0.00	$0.00	1.0000000000	$5,827,000.00
IA6	$111,493,000.00	$48,629,607.45	$0.00	$0.00	$12,432,682.25	0.3246564825	$36,196,925.20
IA7	$15,573,000.00	$15,573,000.00	$0.00	$0.00	$0.00	1.0000000000	$15,573,000.00
IA8	$2,000,000.00	$2,000,000.00	$0.00	$0.00	$0.00	1.0000000000	$2,000,000.00
IA9	$2,000,000.00	$2,000,000.00	$0.00	$0.00	$0.00	1.0000000000	$2,000,000.00
IA10	$2,000,000.00	$2,000,000.00	$0.00	$0.00	$0.00	1.0000000000	$2,000,000.00
IA11	$2,000,000.00	$2,000,000.00	$0.00	$0.00	$0.00	1.0000000000	$2,000,000.00
IA12	$2,000,000.00	$2,000,000.00	$0.00	$0.00	$0.00	1.0000000000	$2,000,000.00
IA13	$434,782.00	$434,782.61	$0.00	$0.00	$0.00	1.0000014030	$434,782.61
IA14	$4,942,895.00	$4,942,895.00	$0.00	$0.00	$0.00	1.0000000000	$4,942,895.00
IA15	$645,956.00	$645,956.52	$0.00	$0.00	$0.00	1.0000008050	$645,956.52
IIA1	$148,721,845.00	$93,062,869.27	$0.00	$0.00	$10,776,647.72	0.5532894078	$82,286,221.55
IIA2	$20,280,251.00	$12,690,390.89	$0.00	$0.00	$1,469,542.83	0.5532894075	$11,220,848.06
IX	$2,384,712.00	$1,604,005.77	$0.00	$0.00	$0.00	0.6375843792	$1,520,455.12
IIX	$3,890,712.00	$1,904,384.89	$0.00	$0.00	$0.00	0.4245623552	$1,651,849.85
IP	$371,749.74	$353,825.86	$0.00	$0.00	$29,863.34	0.8714532524	$323,962.52
IIP	$220,892.47	$180,177.99	$0.00	$0.00	$11,671.93	0.7628420290	$168,506.06
CB1	$3,897,242.00	$3,837,597.54	$0.00	$0.00	$8,806.23	0.9824361202	$3,828,791.31
CB2	$1,855,828.00	$1,827,425.90	$0.00	$0.00	$4,193.44	0.9824361202	$1,823,232.46
CB3	$742,331.00	$730,970.16	$0.00	$0.00	$1,677.37	0.9824361235	$729,292.79
CB4	$556,748.00	$548,227.38	$0.00	$0.00	$1,258.03	0.9824361291	$546,969.35
CB5	$371,165.00	$365,484.59	$0.00	$0.00	$838.69	0.9824361133	$364,645.90
CB6	$556,751.83	$548,231.14	$0.06	$0.00	$1,257.99	0.9824360883	$546,973.09
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	$371,165,799.04	$227,663,025.14	$0.06	$0.00	$28,142,049.61	0.5375521559	$199,520,975.47

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.02MS10
Distribution Date: 08/25/2003
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA1	$24,277,000.00	443.01643984	0.00000000	0.00000000	110.15631421	0.3328601256	332.86012563
IA2	$6,621,000.00	443.01644163	0.00000000	0.00000000	110.15631476	0.3328601269	332.86012687
IA3	$6,621,000.00	443.01644163	0.00000000	0.00000000	0.00000000	0.3328601269	332.86012687
IA4	$14,857,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
IA5	$5,827,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
IA6	$111,493,000.00	436.16735983	0.00000000	0.00000000	111.51087736	0.3246564825	324.65648247
IA7	$15,573,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
IA8	$2,000,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
IA9	$2,000,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
IA10	$2,000,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
IA11	$2,000,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
IA12	$2,000,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
IA13	$434,782.00	1,000.00140300	0.00000000	0.00000000	0.00000000	1.0000014030	1,000.00140300
IA14	$4,942,895.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
IA15	$645,956.00	1,000.00080501	0.00000000	0.00000000	0.00000000	1.0000008050	1,000.00080501
IIA1	$148,721,845.00	625.75117509	0.00000000	0.00000000	72.46176727	0.5532894078	553.28940782
IIA2	$20,280,251.00	625.75117487	0.00000000	0.00000000	72.46176736	0.5532894075	553.28940751
IX	$2,384,712.00	672.62032900	0.00000000	0.00000000	0.00000000	0.6375843792	637.58437916
IIX	$3,890,712.00	489.46950841	0.00000000	0.00000000	0.00000000	0.4245623552	424.56235517
IP	$371,749.74	951.78509069	0.00000000	0.00000000	80.33183830	0.8714532524	871.45325240
IIP	$220,892.47	815.68190170	0.00000000	0.00000000	52.83987272	0.7628420290	762.84202897
CB1	$3,897,242.00	984.69572585	0.00000000	0.00000000	2.25960564	0.9824361202	982.43612021
CB2	$1,855,828.00	984.69572611	0.00000000	0.00000000	2.25960595	0.9824361202	982.43612016
CB3	$742,331.00	984.69572199	0.00000000	0.00000000	2.25959848	0.9824361235	982.43612351
CB4	$556,748.00	984.69573308	0.00000000	0.00000000	2.25960399	0.9824361291	982.43612909
CB5	$371,165.00	984.69572831	0.00000000	0.00000000	2.25961500	0.9824361133	982.43611332
CB6	$556,751.83	984.69571263	0.00010777	0.00000000	2.25951660	0.9824360883	982.43608827
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: WAMMS.02MS10
Distribution Date: 08/25/2003

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	$24,277,000.00	5.0000000000%	5.0000000000%	$10,755,110.11	$44,812.96	$0.00	$0.00	$0.00	$44,812.96
IA2	$6,621,000.00	1.6750000000%	1.6750000000%	$2,933,211.86	$4,094.27	$0.00	$0.00	$0.00	$4,094.27
IA3	$6,621,000.00	6.8250000000%	6.8250000000%	$2,933,211.86	$16,682.64	$0.00	$0.00	$0.00	$16,682.64
IA4	$14,857,000.00	5.5000000000%	5.5000000000%	$14,857,000.00	$68,094.58	$0.00	$0.00	$0.00	$68,094.58
IA5	$5,827,000.00	5.7500000000%	5.7500000000%	$5,827,000.00	$27,921.04	$0.00	$0.00	$0.00	$27,921.04
IA6	$111,493,000.00	5.7500000000%	5.7500000000%	$48,629,607.45	$233,016.87	$0.00	$0.00	$0.00	$233,016.87
IA7	$15,573,000.00	5.7500000000%	5.7500000000%	$15,573,000.00	$74,620.63	$0.00	$0.00	$0.00	$74,620.63
IA8	$2,000,000.00	5.5000000000%	5.5000000000%	$2,000,000.00	$9,166.67	$0.00	$0.00	$0.00	$9,166.67
IA9	$2,000,000.00	5.5000000000%	5.5000000000%	$2,000,000.00	$9,166.67	$0.00	$0.00	$0.00	$9,166.67
IA10	$2,000,000.00	5.5000000000%	5.5000000000%	$2,000,000.00	$9,166.67	$0.00	$0.00	$0.00	$9,166.67
IA11	$2,000,000.00	5.5000000000%	5.5000000000%	$2,000,000.00	$9,166.67	$0.00	$0.00	$0.00	$9,166.67
IA12	$2,000,000.00	5.5000000000%	5.5000000000%	$2,000,000.00	$9,166.67	$0.00	$0.00	$0.00	$9,166.67
IA13	$434,782.00	5.7500000000%	5.7500000000%	$434,782.61	$2,083.33	$0.00	$0.00	$0.00	$2,083.33
IA14	$4,942,895.00	5.7500000000%	5.7500000000%	$4,942,895.00	$23,684.71	$0.00	$0.00	$0.00	$23,684.71
IA15	$645,956.00	5.7500000000%	5.7500000000%	$645,956.52	$3,095.21	$0.00	$0.00	$0.00	$3,095.21
IIA1	$148,721,845.00	5.2500000000%	5.2500000000%	$93,062,869.27	$407,150.05	$0.00	$0.00	$0.00	$407,150.05
IIA2	$20,280,251.00	5.5000000000%	5.5000000000%	$12,690,390.89	$58,164.29	$0.00	$0.00	$0.00	$58,164.29
IX	$2,384,712.00	5.7500000000%	5.7500000000%	$1,604,005.77	$7,685.86	$0.00	$0.00	$0.00	$7,685.86
IIX	$3,890,712.00	5.2800000000%	5.2800000000%	$1,904,384.89	$8,379.29	$0.00	$0.00	$0.00	$8,379.29
IP	$371,749.74	0.0000000000%	0.0000000000%	$353,825.86	$0.00	$0.00	$0.00	$0.00	$0.00
IIP	$220,892.47	0.0000000000%	0.0000000000%	$180,177.99	$0.00	$0.00	$0.00	$0.00	$0.00
CB1	$3,897,242.00	5.5331917527%	5.5331917527%	$3,837,597.54	$17,695.14	$0.00	$0.00	$0.00	$17,695.14
CB2	$1,855,828.00	5.5331917527%	5.5331917527%	$1,827,425.90	$8,426.25	$0.00	$0.00	$0.00	$8,426.25
CB3	$742,331.00	5.5331917527%	5.5331917527%	$730,970.16	$3,370.50	$0.00	$0.00	$0.00	$3,370.50
CB4	$556,748.00	5.5331917527%	5.5331917527%	$548,227.38	$2,527.87	$0.00	$0.00	$0.00	$2,527.87
CB5	$371,165.00	5.5331917527%	5.5331917527%	$365,484.59	$1,685.25	$0.00	$0.00	$0.00	$1,685.25
CB6	$556,751.83	5.5331917527%	5.5331917527%	$548,231.14	$2,527.89	$0.00	$0.00	$0.00	$2,527.89
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	$371,165,799.04			$227,663,025.14	$1,061,551.97	$0.00	$0.00	$0.00	$1,061,551.97

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.02MS10
Distribution Date: 08/25/2003
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	$24,277,000.00	5.0000000000%	5.0000000000%	443.01643984	1.84590188	0.00000000	0.00000000	0.00000000	1.84590188
IA2	$6,621,000.00	1.6750000000%	1.6750000000%	443.01644163	0.61837638	0.00000000	0.00000000	0.00000000	0.61837638
IA3	$6,621,000.00	6.8250000000%	6.8250000000%	443.01644163	2.51965564	0.00000000	0.00000000	0.00000000	2.51965564
IA4	$14,857,000.00	5.5000000000%	5.5000000000%	1,000.00000000	4.58333311	0.00000000	0.00000000	0.00000000	4.58333311
IA5	$5,827,000.00	5.7500000000%	5.7500000000%	1,000.00000000	4.79166638	0.00000000	0.00000000	0.00000000	4.79166638
IA6	$111,493,000.00	5.7500000000%	5.7500000000%	436.16735983	2.08996861	0.00000000	0.00000000	0.00000000	2.08996861
IA7	$15,573,000.00	5.7500000000%	5.7500000000%	1,000.00000000	4.79166699	0.00000000	0.00000000	0.00000000	4.79166699
IA8	$2,000,000.00	5.5000000000%	5.5000000000%	1,000.00000000	4.58333500	0.00000000	0.00000000	0.00000000	4.58333500
IA9	$2,000,000.00	5.5000000000%	5.5000000000%	1,000.00000000	4.58333500	0.00000000	0.00000000	0.00000000	4.58333500
IA10	$2,000,000.00	5.5000000000%	5.5000000000%	1,000.00000000	4.58333500	0.00000000	0.00000000	0.00000000	4.58333500
IA11	$2,000,000.00	5.5000000000%	5.5000000000%	1,000.00000000	4.58333500	0.00000000	0.00000000	0.00000000	4.58333500
IA12	$2,000,000.00	5.5000000000%	5.5000000000%	1,000.00000000	4.58333500	0.00000000	0.00000000	0.00000000	4.58333500
IA13	$434,782.00	5.7500000000%	5.7500000000%	1,000.00140300	4.79166571	0.00000000	0.00000000	0.00000000	4.79166571
IA14	$4,942,895.00	5.7500000000%	5.7500000000%	1,000.00000000	4.79166764	0.00000000	0.00000000	0.00000000	4.79166764
IA15	$645,956.00	5.7500000000%	5.7500000000%	1,000.00080501	4.79167312	0.00000000	0.00000000	0.00000000	4.79167312
IIA1	$148,721,845.00	5.2500000000%	5.2500000000%	625.75117509	2.73766137	0.00000000	0.00000000	0.00000000	2.73766137
IIA2	$20,280,251.00	5.5000000000%	5.5000000000%	625.75117487	2.86802614	0.00000000	0.00000000	0.00000000	2.86802614
IX	$2,384,712.00	5.7500000000%	5.7500000000%	672.62032900	3.22297200	0.00000000	0.00000000	0.00000000	3.22297200
IIX	$3,890,712.00	5.2800000000%	5.2800000000%	489.46950841	2.15366493	0.00000000	0.00000000	0.00000000	2.15366493
IP	$371,749.74	0.0000000000%	0.0000000000%	951.78509069	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIP	$220,892.47	0.0000000000%	0.0000000000%	815.68190170	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
CB1	$3,897,242.00	5.5331917527%	5.5331917527%	984.69572585	4.54042628	0.00000000	0.00000000	0.00000000	4.54042628
CB2	$1,855,828.00	5.5331917527%	5.5331917527%	984.69572611	4.54042616	0.00000000	0.00000000	0.00000000	4.54042616
CB3	$742,331.00	5.5331917527%	5.5331917527%	984.69572199	4.54042738	0.00000000	0.00000000	0.00000000	4.54042738
CB4	$556,748.00	5.5331917527%	5.5331917527%	984.69573308	4.54042044	0.00000000	0.00000000	0.00000000	4.54042044
CB5	$371,165.00	5.5331917527%	5.5331917527%	984.69572831	4.54043350	0.00000000	0.00000000	0.00000000	4.54043350
CB6	$556,751.83	5.5331917527%	5.5331917527%	984.69571263	4.54042513	0.00000000	0.00000000	0.00000000	4.54042513
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
08/2003 DISTRIBUTION REPORT
SERIES: WAMMS 02MS10 WEIGHTED AVERAGE PC RATE: 5.59539%
POOL NUMBER: Group 1(2003,2004)
ISSUE DATE: 12/30/2002
CERTIFICATE BALANCE AT ISSUE: $371,165,799.04
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	499		$227,663,025.13
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$535,224.16
Unscheduled Principal Collection/Reversals		$380,269.97
Liquidations-in-full	58	$27,226,555.53
Net principal Distributed		$28,142,049.66	-$28,142,049.66

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	441		$199,520,975.47

SCHEDULED INTEREST AT MORTGAGE RATE:		$1,164,703.66

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
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$103,151.74

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:		$29,203,601.58

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WAMMS 02MS10 WEIGHTED AVERAGE PC RATE: 5.81087%
POOL NUMBER: 2003
ISSUE DATE: 12/30/2002
CERTIFICATE BALANCE AT ISSUE: $198,224,471.41
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	262		$118,104,766.80
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$118,205.61
Unscheduled Principal Collection/Reversals		$91,677.27
Liquidations-in-full	33	$15,660,507.97
Net principal Distributed		$15,870,390.85	-$15,870,390.85

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	229		$102,234,375.95

SCHEDULED INTEREST AT MORTGAGE RATE:		$625,801.58

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
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$53,892.50

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:		$16,442,299.93

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WAMMS 02MS10 WEIGHTED AVERAGE PC RATE: 5.36310%
POOL NUMBER: 2004
ISSUE DATE: 12/30/2002
CERTIFICATE BALANCE AT ISSUE: $172,941,327.63
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	237		$109,558,258.33
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$417,018.55
Unscheduled Principal Collection/Reversals		$288,592.70
Liquidations-in-full	25	$11,566,047.56
Net principal Distributed		$12,271,658.81	-$12,271,658.81

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	212		$97,286,599.52

SCHEDULED INTEREST AT MORTGAGE RATE:		$538,902.08

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
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$49,259.24

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:		$12,761,301.65

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WAMMS 02MS10 WEIGHTED AVERAGE PC RATE: 5.59539%
POOL NUMBER: ALL
ISSUE DATE: 12/30/2002
CERTIFICATE BALANCE AT ISSUE: $371,165,799.04
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	499		$227,663,025.13
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$535,224.16
Unscheduled Principal Collection/Reversals		$380,269.97
Liquidations-in-full	58	$27,226,555.53
Net principal Distributed		$28,142,049.66	-$28,142,049.66

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	441		$199,520,975.47

SCHEDULED INTEREST AT MORTGAGE RATE:		$1,164,703.66

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
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$103,151.74

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:		$29,203,601.58

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.02MS10
Distribution Date: 08/25/2003

Distribution by Group
Pool ID		Principal		Interest		Total
Group 1(2003,2004)		$28,142,049.66		$1,061,551.92		$29,203,601.58
Pool - 2003		$15,870,390.85		$571,909.08		$16,442,299.93
Pool - 2004		$12,271,658.81		$489,642.84		$12,761,301.65
Aggregate		$28,142,049.66		$1,061,551.92		$29,203,601.58

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(2003,2004)	$227,663,025.13	499	58	441	$199,520,975.47	$535,224.16	$27,226,555.53	$380,269.97	$28,142,049.66
Pool - 2003	$118,104,766.80	262	33	229	$102,234,375.95	$118,205.61	$15,660,507.97	$91,677.27	$15,870,390.85
Pool - 2004	$109,558,258.33	237	25	212	$97,286,599.52	$417,018.55	$11,566,047.56	$288,592.70	$12,271,658.81
Aggregate	$227,663,025.13	499	58	441	$199,520,975.47	$535,224.16	$27,226,555.53	$380,269.97	$28,142,049.66

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(2003,2004)	9	$3,859,422.20	0	$0.00	0	$0.00	0	$0.00
Pool - 2003	4	$1,853,299.46	0	$0.00	0	$0.00	0	$0.00
Pool - 2004	5	$2,006,122.74	0	$0.00	0	$0.00	0	$0.00
Aggregate	9	$3,859,422.20	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(2003,2004)		0		$0.00		0		$0.00
Pool - 2003		0		$0.00		0		$0.00
Pool - 2004		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(2003,2004)			0			$0.00
Aggregate			0			$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.02MS10
Distribution Date: 08/25/2003

INSURANCE RESERVES - Group 1(2003,2004)
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	$0.00	$0.00	$0.00	$0.00	$0.00
Bankruptcy Bond
Single-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$0.00	$0.00	$0.00	$0.00	$0.00

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	$0.00	$0.00	$0.00	$0.00	$0.00
Bankruptcy Bond
Single-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$0.00	$0.00	$0.00	$0.00	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMMS.02MS10
Distribution Date: 08/25/2003

The Group C-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 December 20, 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 C-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 CB1,CB2,CB3,CB4,CB5,CB6 Certificatesimmediately after the principal and interest distribution on 200308 are as follows:

Class			Class Principal Balance
CB1			$3,828,791.31
CB2			$1,823,232.46
CB3			$729,292.79
CB4			$546,969.35
CB5			$364,645.90
CB6			$546,973.09
Total			$7,839,904.90
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 $0.00, $0.00, $0.00 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 MSC MORT PASS THRU CERT SER 2002-MS10 8-K