EOD Primary Tumor

Notes

**Note 1:** If there is a discrepancy between the Clark level and the pathological description of extent (invasion into the layers of the dermis), use the higher (more extensive) code. **Note 2:** Code the greatest extent of invasion from any procedure performed on the lesion, whether it is described as a biopsy or an excision. For example, if a punch biopsy with involvement of Clark level IV is followed by a re-excision with residual tumor involving Clark level II, code 300 (Clark level IV). **Note 3:** Satellite lesions/nodules or in-transit metastases are coded in EOD Regional Nodes. **Note 4:** In addition to EOD Primary Tumor, the following data items are also collected to determine the extent of the primary tumor: - *Breslow’s Thickness* [NAACCR Data Item #3817] and - *Ulceration* [NAACCR Data Item #3936]
Code Description SS2018 T
000 In situ, intraepidermal, intraepithelial, noninvasive (Basement membrane of the epidermis is intact) Clark level I IS
100 Papillary dermis invaded Clark level II L
200 Papillary-reticular dermal interface invaded Clark level III L
300 Reticular dermis invaded Clark level IV L
400 Skin/dermis, NOS Localized, NOS L
500 Subcutaneous tissue (through entire dermis) Clark level V RE
700 Bone Skeletal muscle Underlying cartilage Further contiguous extension D
800 No evidence of primary tumor Regressed melanoma (complete) U
999 Unknown; extension not stated Primary tumor cannot be assessed Not documented in patient record Death Certificate Only U
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