ICD-10 Code C44.1091 – Unspecified malignant neoplasm of skin of left upper eyelid, including canthus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C44.1091 – Unspecified malignant neoplasm of skin of left upper eyelid, including canthus
What it is
This code identifies a malignant skin tumor on the left upper eyelid, including the canthus, when the specific skin cancer type is not documented. Use it for a confirmed malignancy limited to the eyelid skin.
Clinical signs
Clinical features vary; refer to documentation. Commonly, eyelid skin cancers present as a persistent lesion, nonhealing area, ulceration, bleeding, crusting, or a changing nodule on the left upper lid.
When to use this code
Use this code when the provider documents a malignant neoplasm of the skin of the left upper eyelid, including the canthus, but does not specify the histology. It is appropriate when pathology or the note confirms malignancy and the site is clearly the left upper eyelid skin.
If the record later identifies a specific skin cancer type, code that documented diagnosis instead. Check documentation when the lesion involves deeper eyelid structures or another anatomic site.
Do not use for
Do not use this code for benign eyelid lesions, premalignant changes, or cancers of the conjunctiva or other non-skin eyelid structures. Check documentation if the laterality or exact eyelid location is unclear.
Coding tip
Confirm both the left side and the upper eyelid skin location before assigning C44.1091.