Collaborative Stage

Collaborative Stage for TNM 7 - Revised 10/27/2009 [ Schema ]

MerkelCellSkin

CS Extension

Note 1: In the case of multiple simultaneous tumors, code the tumor with greatest extension.
Note 2: Skin ulceration does not alter the Collaborative Stage classification.
Note 3: In-transit metastasis is coded in the CS Lymph Nodes field.
Note 4: If the ONLY information regarding the tumor extension is the physician's statement of the T category, assign code 600, 610, or 620. (Refer to CS Tumor Size table for instructions on coding tumor size).

Code	Description	TNM 7 Map	TNM 6 Map	SS77 Map	SS2000 Map
000	In situ: noninvasive	Tis	Tis	IS	IS
100	Lesion(s) confined to dermis	^	*	L	L
400	Localized, NOS	^	*	L	L
500	Subcutaneous tissue (through entire dermis)	^	*	L	L
600	Stated as T1 with no other information on extension	^	*	L	L
610	Stated as T2 with no other information on extension	^	*	L	L
620	Stated as T3 with no other information on extension	^	*	L	L
700	Underlying cartilage, bone, skeletal muscle	T4	T4	D	RE
800	Further contiguous extension	T4	T4	D	D
950	No evidence of primary tumor	T0	T0	U	U
999	Unknown extension Primary tumor cannot be assessed Not documented in patient record	TX	TX	U	U

^ For Extension codes 100, 400, 500, 600, 610 and 620 ONLY, the T category is assigned based on the value of CS Tumor Size as shown in the Extension Size Table for this site.
* For Extension codes 100, 400, 500, 600, 610 and 620 ONLY, the T category is assigned based on the value of CS Tumor Size as shown in the Extension Size Table for this site.