ICD-10 Code D04.122 – Carcinoma in situ of skin of left lower eyelid, including canthus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D04.122 – Carcinoma in situ of skin of left lower eyelid, including canthus
What it is
This code identifies a noninvasive skin cancer confined to the epithelium of the left lower eyelid, including the canthus. It means abnormal cells are present in place, without documented invasion into deeper tissue.
Clinical signs
Findings may include a persistent eyelid lesion, scaling, crusting, redness, or a nonhealing patch on the left lower lid. Clinical features vary; refer to documentation for biopsy or pathology confirmation.
When to use this code
Use D04.122 when the record clearly states carcinoma in situ of the skin on the left lower eyelid or left lower canthus. It is appropriate when pathology or clinician documentation confirms a noninvasive malignant lesion at this exact site. If the note is nonspecific about laterality or depth, check documentation.
Do not use for
Do not use this code for invasive eyelid cancer, benign skin lesions, or lesions on the upper eyelid or other facial sites. If the documentation says “suspected,” “rule out,” or is not specific, check documentation.
Coding tip
Verify both laterality and the exact eyelid location, because this code is site-specific and not interchangeable with other eyelid skin codes.