ICD-10 Code C44.1991 – Other specified malignant neoplasm of skin of left upper eyelid, including canthus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C44.1991 – Other specified 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 lesion does not fit a more specific skin cancer category. Use it for documented skin malignancy at this exact eyelid location.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include a persistent eyelid lesion, ulceration, crusting, bleeding, or a nonhealing mass on the left upper lid or canthal area.
When to use this code
Use this code when the provider documents a malignant neoplasm of the skin on the left upper eyelid, including the canthus, and specifies it as “other specified” rather than basal cell, squamous cell, or melanoma. It is appropriate for pathology-confirmed or clinically documented skin cancer at this site when no more specific code applies.
Do not use for
Do not use this code for benign eyelid lesions, inflammatory conditions, or tumors arising from the eyelid margin structures without skin involvement. If the documentation names a different skin cancer type, code that specific diagnosis instead.
Coding tip
Verify both the anatomic site and the exact tumor description in the note before assigning C44.1991.