ICD-10 Code D03.10 – Melanoma in situ of unspecified eyelid, including canthus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D03.10 – Melanoma in situ of unspecified eyelid, including canthus
What it is
D03.10 identifies melanoma in situ on an unspecified eyelid, including the inner or outer canthus. It means malignant melanocytes are confined to the epidermis and have 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 plaque noted on exam or pathology.
When to use this code
Use this code when the provider documents melanoma in situ of the eyelid but does not specify upper or lower eyelid. It also applies when the lesion involves the canthus and laterality is not recorded. Confirm the diagnosis is in situ, not invasive, and that the site is the eyelid.
Do not use for
Do not use D03.10 for invasive melanoma, benign eyelid lesions, or melanoma in situ at a different skin site. Check documentation if the eyelid location or laterality is specified elsewhere.
Coding tip
Code only after confirming both the in situ diagnosis and the unspecified eyelid site in the record.