Collaborative Stage

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: Skin of genital sites is not included in this schema. These sites are skin of vulva (C51.0-C51.2, C51.8-C51.9), skin of penis (C60.0-C60.1, C60.8, C60.9) and skin of scrotum (C63.2).
Note 4: ONLY assign code 400 (localized, NOS) when no further information is available to assign code 100, 500, 510, or 520.
Note 5: If the ONLY information regarding tumor extension is the physician's statement of the T category, assign code 510, 520, 600 or 810. (Refer to CS Tumor Size table for instructions on coding tumor size if assigning code 510).
Note 6: AJCC 7th Edition T1 and T2 categories are based on size and high risk features and not depth of invasion/extension. AJCC 7th Edition only includes a T3 category for head and neck skin primaries.

^ For Extension codes 100, 400, 500, 510 and 550 ONLY, the T category for AJCC 7th Edition is assigned based on the value of CS Tumor Size and Site-Specific Factor 12, High Risk Features as shown in the Extension Size High Risk Table for this site.
* For Extension codes 100, 400, 500 and 510 ONLY, the T category for AJCC 6th Edition is assigned based on value of CS Tumor Size as shown in the Extension Size Table AJCC 6 for this site.

Code	Description	TNM 7 Map	TNM 6 Map	SS77 Map	SS2000 Map
000	In situ: noninvasive; intraepidermal; Bowen disease	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
510	Stated as T1 with no other information on extension	^	*	L	L
520	Stated as T2 with no other information on extension	T2	T2	L	L
550	Underlying cartilage and/or skeletal muscle	^	T4	D	RE
600	For skin of head and neck primaries only: Maxilla Mandible Orbital bone Temporal bone Stated as T3 with no other information on extension	T3	T4	D	RE
700	OBSOLETE DATA RETAINED V0200 Invasion of cartilage, bone, skeletal muscle reclassified in 7th Edition, see codes 550, 600, 710 and 750. Underlying cartilage, bone, skeletal muscle	ERROR	T4	D	RE
710	For skin of head and neck primaries only: Direct or perineural invasion of skull base	T4	T4	D	RE
750	Bone (other than in code 600 or 710)	T4	T4	D	RE
800	Further contiguous extension	T4	T4	D	D
810	Stated as T4 with no other information on extension	T4	T4	D	RE
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

CS Extension