ICD-10 Code D04.112 – Carcinoma in situ of skin of right lower eyelid, including canthus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D04.112 – Carcinoma in situ of skin of right lower eyelid, including canthus
What it is
This code identifies carcinoma in situ limited to the skin of the right lower eyelid, including the canthus. The lesion has not invaded deeper tissues, so you should code it as a localized preinvasive skin cancer.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the record describes a suspicious eyelid lesion with abnormal cells confined to the epidermis, confirmed by pathology or specialist assessment.
When to use this code
Use this code when documentation states carcinoma in situ, Bowen disease, or equivalent wording for the right lower eyelid or its canthus. It is appropriate when the provider specifies that the lesion is confined to the skin and not invasive.
If the note identifies the exact eyelid site and laterality, you should code this specific option rather than a nonspecific eyelid skin code. Check documentation when the pathology report or assessment is unclear.
Do not use for
Do not use this code for invasive eyelid cancer, benign eyelid lesions, or lesions on the left or unspecified side. If the site is different or the depth of invasion is not documented, check documentation.
Coding tip
Match laterality and exact eyelid location to the pathology or provider note before assigning D04.112.