Site-Specific Factor 2

Clark Level


**Note 1:** Code the Clark level as documented in the pathology report. **Note 2:** Record only for squamous cell carcinoma of skin of eyelid. * For other histologies, use code 987, not applicable




NAACCR #2890
Code Description
010 Clark level I
In situ, intraepidermal, intraepithelial, noninvasive
Basement membrane of epidermis is intact
020 Clark level II
Papillary dermis invaded
030 Clark level III
Papillary-reticular dermal interface invaded
040 Clark level IV
Reticular dermis invaded
050 Clark level V
Subcutaneous tissue invaded (through entire dermis)
987 Not applicable, not squamous cell carcinoma of skin of eyelid
988 Not applicable: Information not collected for this case
998 No histologic examination of primary site
999 Unknown or no information
Not documented in patient record