D03.10

HCC Category Mapping

What This Code Means

Abnormal melanoma cells on the eyelid or corner of the eye (canthus) that have not yet invaded deeper tissue, affecting an unspecified eye.

Coding Tips

• •When the specific eyelid (upper or lower) and eye (right or left) are documented, use more specific codes D03.111, D03.112, D03.121, or D03.122
• •Eyelid melanomas require careful monitoring due to proximity to the eye and potential vision impact

Clinical Significance

Melanoma in situ of the eyelid is a non-invasive melanocytic neoplasm confined to the epidermis of the eyelid or canthus, with no dermal invasion. This location carries particular clinical importance due to proximity to the eye and the challenges of achieving clear surgical margins without functional or cosmetic compromise. Mohs micrographic surgery or staged excision is often preferred to preserve periorbital structures.

Documentation Requirements

• ✓Biopsy-confirmed melanoma in situ diagnosis with documented absence of invasion.
• ✓The provider should specify laterality (right vs.
• ✓left) and which eyelid (upper vs.
• ✓lower) is affected to allow assignment of a more specific code.
• ✓When laterality and specific eyelid location are documented, use D03.111, D03.112, D03.121, or D03.122 instead.

Commonly Confused Codes