ICD-10 Code D03.0 – Melanoma in situ of lip (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D03.0 – Melanoma in situ of lip
What it is
D03.0 identifies melanoma in situ of the lip, meaning malignant melanocytes are confined to the epidermis and have not invaded deeper tissue. Use this code for a pathology-confirmed in situ lesion on the lip.
Clinical signs
Lesions may appear as a changing pigmented macule, patch, or irregularly bordered lesion on the lip. Clinical features vary; refer to documentation, and rely on histology when available.
When to use this code
Use D03.0 when the provider documents melanoma in situ specifically on the lip, including vermilion lip involvement. It is appropriate after biopsy or excision confirms in situ disease. If the note says only “melanoma” without depth, check documentation before assigning this code.
Do not use for
Do not use this code for invasive melanoma, dysplastic nevus, or benign pigmented lip lesions. If the site is another part of the mouth or skin, choose the more specific documented code.
Coding tip
Match the anatomic site and histology exactly; if the record does not clearly say “in situ,” check documentation.