CS Mets at DX

Notes

**Note**: With the implementation of AJCC 7 staging, mucinous tumors (morphology codes 8480, 8481, and 8490) with peritoneal involvement confined to the right lower quadrant (RLQ) are classified as T4a. Therefore, such peritoneal metastases are coded in CS Extension.
Code Description AJCC 7 M AJCC 6 M Summary Stage 1977 M Summary Stage 2000 M
00 No distant metastasis M0 Extension Mets AJCC6 NONE NONE
05 For mucinous tumors only:
Intraperitoneal metastasis BEYOND the right lower quadrant, including pseudomyxoma peritonei

Stated as M1a with no other information on distant metastasis		 M1a M1 D D
07 OBSOLETE DATA CONVERTED V0203
See code 23

For non-mucinous tumors:
Any intraperitoneal spread		 ERROR: ERROR: ERROR: ERROR:
08 Superior mesenteric lymph nodes M1b M1 RN D
10 Distant lymph node(s) other than those in code 08
(Includes inferior mesenteric lymph node(s))
Distant lymph node(s), NOS		 M1b M1 D D
20 For mucinous tumors only: (08 and/or 10) + 05 Distant lymph node(s) plus intraperitoneal metastasis BEYOND the right lower quadrant, including pseudomyxoma peritonei M1b M1 D D
23 For non-mucinous tumors only:
Any intraperitoneal spread		 M1b M1 D D
25 For non-mucinous tumors only:
23 + (08 and/or 10)

Intraperitoneal spread plus distant lymph node(s)		 M1b M1 D D
40 OBSOLETE DATA RETAINED V0200
See codes 45 and 60

Distant metastases except distant lymph node(s)
Distant metastasis, NOSCarcinomatosis		 ERROR: M1 D D
45 Distant metastasis except distant lymph node(s) and intraperitoneal spread
Non-peritoneal metastasis
Carcinomatosis		 M1b M1 D D
50 45 + (10 and/or 08

Distant metastasis plus distant lymph node(s)		 M1b M1 D D
55 Stated as M1b with no other information on distant metastasis M1b M1 D D
60 Distant metastasis, NOS

Stated as M1 [NOS] with no other information on distant metastasis		 M1NOS M1 D D
99 Unknown; distant metastasis not stated
Distant metastasis cannot be assessed
Not documented in patient record		 M0 Extension Mets AJCC6 U U
- For CS Mets at DX code 00 and 99, the M category for AJCC 6 staging is determined by the CS Extension code as shown in the Extension Mets AJCC 6 Table for this schema.