ICD-10 Code C44.1121 – Basal cell carcinoma of skin of right upper eyelid, including canthus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C44.1121 – Basal cell carcinoma of skin of right upper eyelid, including canthus
What it is
This code identifies basal cell carcinoma arising on the skin of the right upper eyelid, including the canthus. It reflects a malignant skin tumor at a specific eyelid location.
Clinical signs
Typical findings include a persistent eyelid lesion that may be pearly, raised, ulcerated, or slowly enlarging. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents basal cell carcinoma of the right upper eyelid, with or without mention of the canthus. It is appropriate when the lesion is confirmed as skin cancer at that exact site. Check documentation if the record only says eyelid cancer without laterality or exact subsite.
Do not use for
Do not use it for lesions of the left eyelid, unspecified eyelid, or non-skin eyelid tumors. Do not assign it when the diagnosis is not basal cell carcinoma or the site is not documented.
Coding tip
Match laterality and eyelid subsite exactly; if the note is vague, query the provider before coding.