C43.8

Billable

Malignant melanoma of overlapping sites of 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

A type of skin cancer (melanoma) that involves multiple overlapping areas of the skin rather than being confined to one specific location. This serious cancer requires prompt treatment.

Coding Tips

•Use this code when melanoma involves two or more contiguous or overlapping skin sites
•Document all involved anatomical sites in the medical record for comprehensive treatment planning

Clinical Significance

Malignant melanoma of overlapping sites of skin. This code is used when a single melanoma extends across two or more contiguous skin anatomic sites and the primary site cannot be determined, or when the melanoma equally involves multiple sites. This is uncommon and most melanomas can be assigned to a single primary site.

Documentation Requirements

✓Documentation that the melanoma crosses anatomic site boundaries
✓Description of which overlapping sites are involved
✓Breslow depth and ulceration status
✓Sentinel lymph node biopsy results
✓AJCC staging
✓Reason a single primary site cannot be identified

Commonly Confused Codes

C43.9 — Melanoma of skin, unspecified; for when the site is unknown, not overlapping C43.59 — Melanoma of other parts of trunk; if the melanoma is primarily on the trunk with extension to an adjacent site C79.2 — Secondary malignant neoplasm of skin; for melanoma metastases to skin (satellite lesions or in-transit metastases)Site-specific melanoma codes (C43.0-C43.72) — always preferred when a primary site can be identified

Code Hierarchy

└C43Malignant melanoma of skin └C43.8Malignant melanoma of overlapping sites of skin

└C43.8Malignant melanoma of overlapping sites of skin