Collaborative Stage for TNM 7 - Revised 12/28/2009 [ Schema ]
| Code | Description |
| 010 | Clark's level I In situ: noninvasive; intraepidermal Basement membrane of epidermis is intact |
| 020 | Clark's level II Papillary dermis invaded |
| 030 | Clark's level III Papillary-reticular dermal interface invaded |
| 040 | Clark's level IV Reticular dermis invaded |
| 050 | Clark's level V Subcutaneous tissue invaded (through entire dermis) |
| 988 | Not applicable: not collected for this case |
| 998 | No histologic examination of primary site |
| 999 | Unknown Clark's level Cannot be assessed Not documented in patient record |