ICD-10 Code D03.8 – Melanoma in situ of other sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D03.8 – Melanoma in situ of other sites
What it is
D03.8 identifies melanoma in situ found in a site other than the specifically listed anatomic categories. It means malignant melanocytic cells are confined to the epidermis and have not invaded deeper tissue.
Clinical signs
Clinical features vary; refer to documentation. You may see an atypical pigmented lesion with asymmetry, irregular borders, color variation, or change over time, but the diagnosis depends on pathology confirming in situ disease.
When to use this code
Use this code when the provider documents melanoma in situ and the lesion location is not captured by a more specific site code. It also fits pathology-confirmed in situ melanoma at an “other site” location. If the record names a more specific anatomic site, code that site instead.
Do not use for
Do not use D03.8 for invasive melanoma, uncertain behavior lesions, or benign nevi. Do not use it when documentation supports a more specific melanoma in situ site code.
Coding tip
Check the pathology report and exact lesion location before assigning D03.8.