ICD-10 Code D03.1 – Melanoma in situ of eyelid, including canthus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D03.1 – Melanoma in situ of eyelid, including canthus
What it is
D03.1 identifies melanoma in situ on the eyelid, including the canthus. The lesion is confined to the epidermis and has not invaded deeper tissue.
Clinical signs
Clinical features vary; refer to documentation. You may see a changing pigmented eyelid lesion, irregular borders, color variation, or a flat or slightly raised patch noted on exam.
When to use this code
Use this code when the provider documents melanoma in situ of the eyelid or canthus, including laterality if present elsewhere in the record. It fits pathology-confirmed in situ disease limited to the eyelid region. Check documentation if the note only says suspicious lesion, atypia, or melanoma without site detail.
Do not use for
Do not use D03.1 for invasive melanoma, benign eyelid nevi, or non-melanoma skin cancers. If the site is another part of the face or the exact diagnosis is unclear, check documentation.
Coding tip
Capture the exact anatomic site and confirm the pathology wording says “in situ” before assigning D03.1.