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's level I
Basement membrane of the epidermis is intact
Tis IS IS
10 Papillary dermis invaded
Clark's level II
* L L
20 Papillary-reticular dermal interface invaded
Clark's level III
* L L
30 Reticular dermis invaded
Clark's level IV
* L L
40 Skin/dermis, NOS
Localized, NOS
* L L
50 Subcutaneous tissue invaded (through entire dermis)
Clark's 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.

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