Collaborative Stage

Note: The term "skip metastasis" is not used with a consistent meaning in the literature. In some cases, it refers to discontinuous metastasis in the same bone as the primary tumor, while in other cases it refers to discontinuous metastasis in an adjacent bone, usually in the same limb. For AJCC staging, discontinuous metastasis in the same bone is classified as T3 (coded in CS Extension), and discontinuous metastasis in an adjacent bone is classified as M1b (coded in CS Mets at DX). If a primary bone tumor is stated as having "skip metastasis" or "skip lesions" with no other information regarding the bone involved, use code 820 in CS Extension.

Code	Description	TNM 7 Map	TNM 6 Map	SS77 Map	SS2000 Map
00	No distant metastasis	M0	M0	NONE	NONE
10	OBSOLETE DATA CONVERTED V0203 See code 35 Distant lymph node(s)	ERROR	ERROR	ERROR	ERROR
30	Distant metastasis to lung only Stated as M1a with no other information on distant metastasis	M1a	M1a	D	D
35	Distant lymph node(s)	M1b	M1b	D	D
40	Distant metastasis except distant lymph node(s) or "lung only" Distant metastasis to lung plus other sites except distant lymph nodes. Carcinomatosis	M1b	M1b	D	D
50	(30 or 40) + 35 Distant metastasis plus distant lymph nodes(s)	M1b	M1b	D	D
53	Stated as M1b with no other information on distant metastasis	M1b	M1b	D	D
55	OBSOLETE DATA CONVERTED V0200 See code 60 Stated as M1 NOS	ERROR	ERROR	ERROR	ERROR
60	Distant metastasis, NOS Stated as M1[NOS] with no other information on distant metastasis	M1NOS	M1NOS	D	D
99	Unknown; distant metastasis not stated Distant metastasis cannot be assessed Not documented in patient record	M0	MX	U	U

CS Mets at DX