ICD-10 Code D03.59 – Melanoma in situ of other part of trunk (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D03.59 – Melanoma in situ of other part of trunk
What it is
D03.59 identifies melanoma in situ located on another specified area of the trunk. The lesion is confined to the epidermis and has not invaded deeper tissue.
Clinical signs
Presentation often includes a changing pigmented patch or plaque with asymmetry, irregular borders, color variation, or enlargement. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents melanoma in situ on a trunk site other than the chest, back, or abdomen, and the record supports the exact location. It is appropriate for pathology-confirmed or clinically diagnosed in situ disease when no invasion is documented.
Do not use for
Do not use this code if the melanoma is invasive, metastatic, or described as uncertain behavior. Check documentation if the anatomic site is unspecified or belongs to a different skin region.
Coding tip
Verify the exact trunk subsite in the pathology or operative note before assigning D03.59.