ICD-10 Code C44.109 – Unspecified malignant neoplasm of skin of left eyelid, including canthus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C44.109 – Unspecified malignant neoplasm of skin of left eyelid, including canthus
What it is
This code identifies a malignant skin tumor on the left eyelid or canthus when the record does not specify the exact histology. Use it for a cancerous lesion limited to the skin in that location.
Clinical signs
Findings may include a persistent eyelid or canthal skin lesion, nonhealing ulceration, crusting, bleeding, or a changing pigmented or raised area. Clinical features vary; refer to documentation.
When to use this code
Use C44.109 when the provider documents a malignant neoplasm of the skin of the left eyelid, including the canthus, but does not name a more specific skin cancer type. It also fits when laterality and site are clear, yet pathology details are absent. Check documentation if the lesion is described as eyelid margin, skin, or canthal skin.
Do not use for
Do not use this code for benign eyelid lesions, conjunctival tumors, or malignancies arising from deeper eyelid structures. If the pathology identifies a specific skin cancer subtype, code that diagnosis instead.
Coding tip
Verify that the note specifies the left side and skin of the eyelid or canthus before assigning this code.