Melanoma in situ of other part of trunk

This code signifies the presence of melanoma that is confined to the epidermis (in situ) and has not invaded the dermis, located on any part of the trunk not otherwise specified. This represents the earliest stage of melanoma, where the malignant cells are restricted to the outermost layer of the skin.

Use this code when the pathology report confirms melanoma in situ and the lesion is documented as being on the trunk, excluding specific sites like the back, chest, or abdomen if a more precise code is available. Documentation should clearly state "melanoma in situ" and specify the trunk as the anatomical location.

• Ensure the pathology report explicitly states "in situ" to differentiate from invasive melanoma.
• Verify the exact anatomical site on the trunk; if a more specific code (e.g., D03.51 for back, D03.52 for chest) is available, use that instead.
• Do not use this code for atypical nevi or dysplastic nevi; those have distinct codes.