WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.013
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
IA1	939335AP0	$81,100,000.00	$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	$0.00
IA2	939335AQ8	$18,448,684.00	$47,344.38	7.0000000000%	7.0000000000%	$276.18	$47,344.38	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$47,620.56	$0.00
IIA1	939335AR6	$177,300,000.00	$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	$0.00
IIA2	939335AS4	$17,700,000.00	$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	$0.00
IIA3	939335AT2	$2,038,000.00	$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	$0.00
IIA4	939335AU9	$25,461,614.00	$5,181,364.45	6.7500000000%	6.7500000000%	$29,145.18	$5,216.40	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$34,361.57	$5,176,148.05
IIA5	939335AV7	$2,038,000.00	$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	$0.00
IIA6	939335AW5	$2,038,000.00	$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	$0.00
IIA7	939335AX3	$2,038,000.00	$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	$0.00
IIA8	939335AY1	$3,566,000.00	$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	$0.00
IIA9	939335AZ8	$998,112.00	$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
IIA10	939335BA2	$4,076,000.00	$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	$0.00
IIA11	939335BB0	$3,057,000.00	$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	$0.00
IIA12	939335BC8	$3,057,000.00	$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	$0.00
IIA13	939335BD6	$5,041,000.00	$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	$0.00
IIIA1	939335BE4	$100,000,000.00	$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	$0.00
IIIA2	939335BF1	$20,750,000.00	$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	$0.00
IIIA3	939335BG9	$11,086,000.00	$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	$0.00
IIIA4	939335BH7	$15,465,870.00	$5,926,646.73	6.7500000000%	6.7500000000%	$33,337.39	$909,591.50	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$942,928.88	$5,017,055.23
IX	939335BK0	$5,085,471.00	$81,366.81	7.0000000000%	7.0000000000%	$474.64	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$474.64	$81,249.47
IIX	939335BL8	$4,335,989.00	$170,846.75	6.7500000000%	6.7500000000%	$961.01	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$961.01	$170,693.99
IIIX	939335BM6	$529,188.00	$195,572.20	6.7500000000%	6.7500000000%	$1,100.09	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,100.09	$195,361.83
IIP	939335BP9	$184,406.00	$5,695.65	0.0000000000%	0.0000000000%	$0.00	$9.15	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$9.15	$5,686.50
IIIP	939335BQ7	$184,294.00	$16,047.61	0.0000000000%	0.0000000000%	$0.00	$16.56	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$16.56	$16,031.05
CB1	939335BR5	$6,951,665.00	$6,541,545.76	6.7985727756%	6.7985727756%	$37,060.98	$151,561.50	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$188,622.48	$6,389,984.26
CB2	939335BS3	$5,406,853.00	$5,087,871.23	6.7985727756%	6.7985727756%	$28,825.22	$117,881.22	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$146,706.44	$4,969,990.01
CB3	939335BT1	$2,832,161.00	$2,665,075.32	6.7985727756%	6.7985727756%	$15,098.92	$61,747.30	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$76,846.23	$2,603,328.02
CB4	939335CS2	$1,287,345.00	$1,211,397.02	6.7985727756%	6.7985727756%	$6,863.14	$28,066.94	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$34,930.08	$1,183,330.08
CB5	939335CT0	$1,544,815.00	$1,453,677.35	6.7985727756%	6.7985727756%	$8,235.78	$33,680.35	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$41,916.12	$1,419,997.00
CB6	939335CU7	$1,287,347.00	$638,296.26	6.7985727756%	6.7985727756%	$3,616.25	$14,788.73	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$18,404.98	$623,507.53
R1	939335BU8	$50.00	$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

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.013
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
R2	939335BV6	$50.00	$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
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		$514,938,266.00	$28,774,961.76			$164,994.78	$1,369,904.02	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,534,898.80	$27,405,057.74

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.013
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
IA1	$81,100,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA2	$18,448,684.00	$47,344.38	$0.00	$0.00	$0.00	$0.00	$47,344.38	0.0000000000	$0.00
IIA1	$177,300,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIA2	$17,700,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIA3	$2,038,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIA4	$25,461,614.00	$5,181,364.45	$0.00	$0.00	$0.00	$0.00	$5,216.40	0.2032922206	$5,176,148.05
IIA5	$2,038,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIA6	$2,038,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIA7	$2,038,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIA8	$3,566,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIA9	$998,112.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIA10	$4,076,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIA11	$3,057,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIA12	$3,057,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIA13	$5,041,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA1	$100,000,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA2	$20,750,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA3	$11,086,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA4	$15,465,870.00	$5,926,646.73	$0.00	$0.00	$0.00	$0.00	$909,591.50	0.3243952801	$5,017,055.23
IX	$5,085,471.00	$81,366.81	$0.00	$0.00	$0.00	$0.00	$0.00	0.0159767837	$81,249.47
IIX	$4,335,989.00	$170,846.75	$0.00	$0.00	$0.00	$0.00	$0.00	0.0393667950	$170,693.99
IIIX	$529,188.00	$195,572.20	$0.00	$0.00	$0.00	$0.00	$0.00	0.3691728270	$195,361.83
IIP	$184,406.00	$5,695.65	$0.00	$0.00	$0.00	$0.00	$9.15	0.0308368491	$5,686.50
IIIP	$184,294.00	$16,047.61	$0.00	$0.00	$0.00	$0.00	$16.56	0.0869862828	$16,031.05
CB1	$6,951,665.00	$6,541,545.76	$0.00	$0.00	$0.00	$0.00	$151,561.50	0.9192019840	$6,389,984.26
CB2	$5,406,853.00	$5,087,871.23	$0.00	$0.00	$0.00	$0.00	$117,881.22	0.9192019850	$4,969,990.01
CB3	$2,832,161.00	$2,665,075.32	$0.00	$0.00	$0.00	$0.00	$61,747.30	0.9192019875	$2,603,328.02
CB4	$1,287,345.00	$1,211,397.02	$0.00	$0.00	$0.00	$0.00	$28,066.94	0.9192019855	$1,183,330.08
CB5	$1,544,815.00	$1,453,677.35	$0.00	$0.00	$0.00	$0.00	$33,680.35	0.9192019756	$1,419,997.00
CB6	$1,287,347.00	$638,296.26	$0.00	$0.00	$0.00	$0.00	$14,788.73	0.4843352492	$623,507.53
R1	$50.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.013
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
R2	$50.00	$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	$514,938,266.00	$28,774,961.76	$0.00	$0.00	$0.00	$0.00	$1,369,904.02	0.0532200839	$27,405,057.74

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.013
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
IA1	$81,100,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA2	$18,448,684.00	2.56627410	0.00000000	0.00000000	0.00000000	0.00000000	2.56627410	0.0000000000	0.00000000
IIA1	$177,300,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIA2	$17,700,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIA3	$2,038,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIA4	$25,461,614.00	203.49709370	0.00000000	0.00000000	0.00000000	0.00000000	0.20487311	0.2032922206	203.29222060
IIA5	$2,038,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIA6	$2,038,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIA7	$2,038,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIA8	$3,566,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIA9	$998,112.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIA10	$4,076,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIA11	$3,057,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIA12	$3,057,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIA13	$5,041,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA1	$100,000,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA2	$20,750,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA3	$11,086,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA4	$15,465,870.00	383.20810468	0.00000000	0.00000000	0.00000000	0.00000000	58.81282463	0.3243952801	324.39528006
IX	$5,085,471.00	15.99985724	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0159767837	15.97678366
IIX	$4,335,989.00	39.40202570	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0393667950	39.36679498
IIIX	$529,188.00	369.57036063	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.3691728270	369.17282705
IIP	$184,406.00	30.88646790	0.00000000	0.00000000	0.00000000	0.00000000	0.04961878	0.0308368491	30.83684913
IIIP	$184,294.00	87.07613921	0.00000000	0.00000000	0.00000000	0.00000000	0.08985643	0.0869862828	86.98628279
CB1	$6,951,665.00	941.00417094	0.00000000	0.00000000	0.00000000	0.00000000	21.80218696	0.9192019840	919.20198399
CB2	$5,406,853.00	941.00417193	0.00000000	0.00000000	0.00000000	0.00000000	21.80218697	0.9192019850	919.20198496
CB3	$2,832,161.00	941.00417314	0.00000000	0.00000000	0.00000000	0.00000000	21.80218568	0.9192019875	919.20198746
CB4	$1,287,345.00	941.00417526	0.00000000	0.00000000	0.00000000	0.00000000	21.80218978	0.9192019855	919.20198548
CB5	$1,544,815.00	941.00416555	0.00000000	0.00000000	0.00000000	0.00000000	21.80218991	0.9192019756	919.20197564
CB6	$1,287,347.00	495.82300654	0.00000000	0.00000000	0.00000000	0.00000000	11.48775738	0.4843352492	484.33524916
R1	$50.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.013
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
R2	$50.00	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: WMMSC.013
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
IA1	$81,100,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA2	$18,448,684.00	7.0000000000%	7.0000000000%	$47,344.38	$276.18	$0.00	$0.00	$0.00	$276.18
IIA1	$177,300,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA2	$17,700,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA3	$2,038,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA4	$25,461,614.00	6.7500000000%	6.7500000000%	$5,181,364.45	$29,145.18	$0.00	$0.00	$0.00	$29,145.18
IIA5	$2,038,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA6	$2,038,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA7	$2,038,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA8	$3,566,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA9	$998,112.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA10	$4,076,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA11	$3,057,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA12	$3,057,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIA13	$5,041,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA1	$100,000,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA2	$20,750,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA3	$11,086,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA4	$15,465,870.00	6.7500000000%	6.7500000000%	$5,926,646.73	$33,337.39	$0.00	$0.00	$0.00	$33,337.39
IX	$5,085,471.00	7.0000000000%	7.0000000000%	$81,366.81	$474.64	$0.00	$0.00	$0.00	$474.64
IIX	$4,335,989.00	6.7500000000%	6.7500000000%	$170,846.75	$961.01	$0.00	$0.00	$0.00	$961.01
IIIX	$529,188.00	6.7500000000%	6.7500000000%	$195,572.20	$1,100.09	$0.00	$0.00	$0.00	$1,100.09
IIP	$184,406.00	0.0000000000%	0.0000000000%	$5,695.65	$0.00	$0.00	$0.00	$0.00	$0.00
IIIP	$184,294.00	0.0000000000%	0.0000000000%	$16,047.61	$0.00	$0.00	$0.00	$0.00	$0.00
CB1	$6,951,665.00	6.7985727756%	6.7985727756%	$6,541,545.76	$37,060.98	$0.00	$0.00	$0.00	$37,060.98
CB2	$5,406,853.00	6.7985727756%	6.7985727756%	$5,087,871.23	$28,825.22	$0.00	$0.00	$0.00	$28,825.22
CB3	$2,832,161.00	6.7985727756%	6.7985727756%	$2,665,075.32	$15,098.92	$0.00	$0.00	$0.00	$15,098.92
CB4	$1,287,345.00	6.7985727756%	6.7985727756%	$1,211,397.02	$6,863.14	$0.00	$0.00	$0.00	$6,863.14
CB5	$1,544,815.00	6.7985727756%	6.7985727756%	$1,453,677.35	$8,235.78	$0.00	$0.00	$0.00	$8,235.78
CB6	$1,287,347.00	6.7985727756%	6.7985727756%	$638,296.26	$3,616.25	$0.00	$0.00	$0.00	$3,616.25
R1	$50.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.013
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
R2	$50.00	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	$514,938,266.00			$28,774,961.76	$164,994.78	$0.00	$0.00	$0.00	$164,994.78

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.013
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
IA1	$81,100,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA2	$18,448,684.00	7.0000000000%	7.0000000000%	2.56627410	0.01497017	0.00000000	0.00000000	0.00000000	0.01497017
IIA1	$177,300,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIA2	$17,700,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIA3	$2,038,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIA4	$25,461,614.00	6.7500000000%	6.7500000000%	203.49709370	1.14467135	0.00000000	0.00000000	0.00000000	1.14467135
IIA5	$2,038,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIA6	$2,038,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIA7	$2,038,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIA8	$3,566,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIA9	$998,112.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIA10	$4,076,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIA11	$3,057,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIA12	$3,057,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIA13	$5,041,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA1	$100,000,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA2	$20,750,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA3	$11,086,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA4	$15,465,870.00	6.7500000000%	6.7500000000%	383.20810468	2.15554573	0.00000000	0.00000000	0.00000000	2.15554573
IX	$5,085,471.00	7.0000000000%	7.0000000000%	15.99985724	0.09333255	0.00000000	0.00000000	0.00000000	0.09333255
IIX	$4,335,989.00	6.7500000000%	6.7500000000%	39.40202570	0.22163571	0.00000000	0.00000000	0.00000000	0.22163571
IIIX	$529,188.00	6.7500000000%	6.7500000000%	369.57036063	2.07882643	0.00000000	0.00000000	0.00000000	2.07882643
IIP	$184,406.00	0.0000000000%	0.0000000000%	30.88646790	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIP	$184,294.00	0.0000000000%	0.0000000000%	87.07613921	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
CB1	$6,951,665.00	6.7985727756%	6.7985727756%	941.00417094	5.33123791	0.00000000	0.00000000	0.00000000	5.33123791
CB2	$5,406,853.00	6.7985727756%	6.7985727756%	941.00417193	5.33123797	0.00000000	0.00000000	0.00000000	5.33123797
CB3	$2,832,161.00	6.7985727756%	6.7985727756%	941.00417314	5.33123647	0.00000000	0.00000000	0.00000000	5.33123647
CB4	$1,287,345.00	6.7985727756%	6.7985727756%	941.00417526	5.33123599	0.00000000	0.00000000	0.00000000	5.33123599
CB5	$1,544,815.00	6.7985727756%	6.7985727756%	941.00416555	5.33124031	0.00000000	0.00000000	0.00000000	5.33124031
CB6	$1,287,347.00	6.7985727756%	6.7985727756%	495.82300654	2.80907168	0.00000000	0.00000000	0.00000000	2.80907168
R1	$50.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.013
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
R2	$50.00	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
12/2003 DISTRIBUTION REPORT
SERIES: WMMSC 013
WEIGHTED AVERAGE PC RATE: 6.88076%
WEIGHTED AVERAGE MATURITY: 319.57930
WEIGHTED AVERAGE LOAN AGE: 35.35879
POOL NUMBER: Group 1(1727,1728,1731)
ISSUE DATE: 04/30/2001
CERTIFICATE BALANCE AT ISSUE: $514,938,237.14
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	71		$28,774,962.96
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$30,734.44
Unscheduled Principal Collection/Reversals		$2,488.59
Liquidations-in-full	3	$1,336,680.99
Subsequent Recoveries		$0.00
Net principal Distributed		$1,369,904.02	-$1,369,904.02

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	68		$27,405,058.94

SCHEDULED INTEREST AT MORTGAGE RATE:		$182,197.92

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:		$17,203.14

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:		$1,534,898.80

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WMMSC 013
WEIGHTED AVERAGE PC RATE: 7.16431%
WEIGHTED AVERAGE MATURITY: 303.43715
WEIGHTED AVERAGE LOAN AGE: 35.86679
POOL NUMBER: 1727
ISSUE DATE: 04/30/2001
CERTIFICATE BALANCE AT ISSUE: $103,427,308.89
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	10		$3,466,452.65
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$3,750.81
Unscheduled Principal Collection/Reversals		$1,113.54
Liquidations-in-full	1	$435,357.08
Subsequent Recoveries		$0.00
Net principal Distributed		$440,221.43	-$440,221.43

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	9		$3,026,231.22

SCHEDULED INTEREST AT MORTGAGE RATE:		$22,648.81

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
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:		$1,953.17

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:		$460,917.07

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WMMSC 013
WEIGHTED AVERAGE PC RATE: 6.82844%
WEIGHTED AVERAGE MATURITY: 322.40224
WEIGHTED AVERAGE LOAN AGE: 36.61832
POOL NUMBER: 1728
ISSUE DATE: 04/30/2001
CERTIFICATE BALANCE AT ISSUE: $258,278,549.48
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	35		$14,212,372.25
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$13,586.85
Unscheduled Principal Collection/Reversals		$264.43
Liquidations-in-full	0	$0.00
Subsequent Recoveries		$0.00
Net principal Distributed		$13,851.28	-$13,851.28

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	35		$14,198,520.97

SCHEDULED INTEREST AT MORTGAGE RATE:		$90,067.48

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:		$9,193.94

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:		$94,724.82

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WMMSC 013
WEIGHTED AVERAGE PC RATE: 6.85921%
WEIGHTED AVERAGE MATURITY: 320.44060
WEIGHTED AVERAGE LOAN AGE: 33.45110
POOL NUMBER: 1731
ISSUE DATE: 04/30/2001
CERTIFICATE BALANCE AT ISSUE: $153,232,378.77
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	26		$11,096,138.06
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$13,396.78
Unscheduled Principal Collection/Reversals		$1,110.62
Liquidations-in-full	2	$901,323.91
Subsequent Recoveries		$0.00
Net principal Distributed		$915,831.31	-$915,831.31

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	24		$10,180,306.75

SCHEDULED INTEREST AT MORTGAGE RATE:		$69,481.63

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
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:		$6,056.03

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:		$979,256.91

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
12/2003 DISTRIBUTION REPORT
SERIES: WMMSC 013
WEIGHTED AVERAGE PC RATE: 6.88076%
WEIGHTED AVERAGE MATURITY: 319.57930
WEIGHTED AVERAGE LOAN AGE: 35.35879
POOL NUMBER: ALL
ISSUE DATE: 04/30/2001
CERTIFICATE BALANCE AT ISSUE: $514,938,237.14
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	71		$28,774,962.96
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$30,734.44
Unscheduled Principal Collection/Reversals		$2,488.59
Liquidations-in-full	3	$1,336,680.99
Subsequent Recoveries		$0.00
Net principal Distributed		$1,369,904.02	-$1,369,904.02

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	68		$27,405,058.94

SCHEDULED INTEREST AT MORTGAGE RATE:		$182,197.92

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:		$17,203.14

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:		$1,534,898.80

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.013
Distribution Date: 12/26/2003

Distribution by Group
Pool ID		Principal		Interest		Total
Group 1(1727,1728,1731)		$1,369,904.02		$164,994.78		$1,534,898.80
Pool - 1727		$440,221.43		$20,695.64		$460,917.07
Pool - 1728		$13,851.28		$80,873.54		$94,724.82
Pool - 1731		$915,831.31		$63,425.60		$979,256.91
Aggregate		$1,369,904.02		$164,994.78		$1,534,898.80

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(1727,1728,1731)	$28,774,962.96	71	3	68	$27,405,058.94	$30,734.44	$1,336,680.99	$2,488.59	$1,369,904.02
Pool - 1727	$3,466,452.65	10	1	9	$3,026,231.22	$3,750.81	$435,357.08	$1,113.54	$440,221.43
Pool - 1728	$14,212,372.25	35	0	35	$14,198,520.97	$13,586.85	$0.00	$264.43	$13,851.28
Pool - 1731	$11,096,138.06	26	2	24	$10,180,306.75	$13,396.78	$901,323.91	$1,110.62	$915,831.31
Aggregate	$28,774,962.96	71	3	68	$27,405,058.94	$30,734.44	$1,336,680.99	$2,488.59	$1,369,904.02

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
Group 1(1727,1728,1731)	3	$972,604.18	1	$333,676.11	0	$0.00	0	$0.00
Pool - 1727	1	$164,370.72	0	$0.00	0	$0.00	0	$0.00
Pool - 1728	1	$471,270.64	0	$0.00	0	$0.00	0	$0.00
Pool - 1731	1	$336,962.82	1	$333,676.11	0	$0.00	0	$0.00
Aggregate	3	$972,604.18	1	$333,676.11	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(1727,1728,1731)		2		$675,863.10		2		$382,895.36
Pool - 1727		0		$0.00		0		$0.00
Pool - 1728		1		$375,289.18		1		$354,370.16
Pool - 1731		1		$300,573.92		1		$28,525.20
Aggregate		2		$675,863.10		2		$382,895.36

Aggregate Loss Amounts by Group
Pool ID			Count			Loss Amount
Group 1(1727,1728,1731)			2			$593,047.56
Aggregate			2			$593,047.56

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.013
Distribution Date: 12/26/2003

INSURANCE RESERVES - Group 1(1727,1728,1731)
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	$5,402,793.00	$0.00	$0.00	$0.00	$5,402,793.00
Bankruptcy Bond
Single-Units	$167,430.00	$0.00	$0.00	$0.00	$167,430.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$3,064,647.56	$0.00	$0.00	$0.00	$3,064,647.56

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	$5,402,793.00	$0.00	$0.00	$0.00	$5,402,793.00
Bankruptcy Bond
Single-Units	$167,430.00	$0.00	$0.00	$0.00	$167,430.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$3,432,921.77	$0.00	$0.00	$0.00	$3,432,921.77

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.013
Distribution Date: 12/26/2003

The Class Principal Balances of each Class of the Class CB1,CB2,CB3,CB4,CB5,CB6 Certificatesimmediately after the principal and interest distribution on 200312 are as follows:

Class			Class Principal Balance
CB1			$6,389,984.26
CB2			$4,969,990.01
CB3			$2,603,328.02
CB4			$1,183,330.08
CB5			$1,419,997.00
CB6			$623,507.53
Total			$17,190,136.91
Capitalized items used but not defined herein have the meanings ascribed to them in the Prospectus Supplement.

WASHINGTON MUTUAL MOR SEC CORP MOR PASS THRU CERT SER 2001-3 8-K