D03.51

Billable

Melanoma in situ of anal skin

HCC Category Mapping

V28HCC 23 — Melanoma and Other Skin Cancers

0.251

V24HCC 12 — Breast, Prostate, and Other Cancers and Tumors

0.150

ESRDHCC 12 — Breast, Prostate, and Other Cancers and Tumors

0.000

RxHCCHCC 22 — Cancer, Other Specified Sites

0.000

What This Code Means

Early-stage melanoma confined to the skin surface in the anal area, before it has invaded deeper layers of tissue.

Coding Tips

•Anal melanomas are rare but have significant clinical implications; ensure documentation clearly identifies this location
•This specific site requires careful staging and treatment planning due to anatomical considerations

Clinical Significance

Melanoma in situ of the anal skin is a rare non-invasive melanocytic neoplasm confined to the epidermis of the perianal region. Anal melanoma is uncommon but clinically significant because the anal region is not typically associated with melanoma, leading to potential diagnostic delays. Early detection at the in situ stage offers excellent prognosis, but the anatomical location requires specialized surgical approaches.

Documentation Requirements

✓Biopsy confirmation with pathology documenting atypical melanocytes confined to the epidermis of the anal skin.
✓The exact location relative to the anal verge (perianal skin vs.
✓anal margin vs.
✓anal canal) must be documented, as anal canal melanoma is classified differently.
✓Include margin status and surveillance plan.

Commonly Confused Codes

D03.59 (melanoma in situ of other part of trunk) should not be used for anal skin C21.0 (malignant neoplasm of anus, unspecified) or C43.51 may apply if invasive melanoma is present D01.3 (carcinoma in situ of anus) represents non-melanocytic in situ carcinoma of the anus.

Code Hierarchy

└D03Melanoma in situ └D03.5Melanoma in situ of trunk └D03.51Melanoma in situ of anal skin

└D03.51Melanoma in situ of anal skin