ICD-10 Code D04.10 – Carcinoma in situ of skin of unspecified eyelid, including canthus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D04.10 – Carcinoma in situ of skin of unspecified eyelid, including canthus
What it is
This code identifies a noninvasive skin cancer confined to the eyelid area, including the canthus, when the site is not further specified. The abnormal cells are limited to the epidermis and have not invaded deeper tissue.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the lesion is described as a persistent eyelid skin change such as a scaly, crusted, or irregular plaque that prompts biopsy and pathology confirmation of carcinoma in situ.
When to use this code
Use D04.10 when the record states carcinoma in situ of the skin on an eyelid, but does not identify upper, lower, or other specific eyelid laterality details. It also fits pathology-confirmed in situ disease of the eyelid skin, including canthal involvement, when documentation remains nonspecific.
Do not use for
Do not use this code for invasive eyelid malignancy, benign eyelid lesions, or lesions documented as a different skin site. If the chart specifies a more exact eyelid location, code that instead.
Coding tip
Check the pathology and operative note for exact eyelid location before assigning the unspecified code.