CS Extension: Melanoma

Note 1: If there is a discrepancy between the Clark level and the pathologic description of extent, use the higher (more extensive) code.

Note 2: Satellite or in-transit metastasis are coded under CS Lymph Nodes.

Note 3: If there is no documentation of ulceration in the pathology report, assume ulceration is not present.

Note 4: Ulceration is determined by histopathological examination and not on clinical evaluation.

Code	Description	TNM	SS77	SS2000
00	In situ: Noninvasive; intraepidermal Clark level I Basement membrane of the epidermis is intact	Tis	IS	IS
10	Papillary dermis invaded Clark level II	*	L	L
20	Papillary-reticular dermal interface invaded Clark level III	*	L	L
30	Reticular dermis invaded Clark level IV	*	L	L
40	Skin/dermis, NOS Localized, NOS	*	L	L
50	Subcutaneous tissue invaded (through entire dermis) Clark level V	*	L	RE
80	Further contiguous extension: Underlying cartilage, bone, skeletal muscle	*	D	D
95	No evidence of primary tumor	T0	U	U
99	Unknown extension Primary tumor cannot be assessed (e.g., shave biopsy or regressed melanoma) Not documented in patient record	*	U	U

* For Extension codes 10 - 80, and 99 ONLY, the T category is assigned based on value the of Site-Specific Factor 1, Measured Thickness and Site-Specific Factor 2, Ulceration, as well as Extra Table 1, Thickness and Ulceration and Extra Table 2, Extension and Ulceration.