ICD-10 Code C43.111 – Malignant melanoma of right upper eyelid, including canthus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C43.111 – Malignant melanoma of right upper eyelid, including canthus
What it is
This code identifies a malignant melanoma arising on the right upper eyelid, including the canthus. Use it when documentation specifies that exact site and confirms melanoma.
Clinical signs
Clinical features may include a pigmented or changing eyelid lesion, irregular borders, or ulceration. Diagnosis is confirmed by pathology; if details are unclear, check documentation.
When to use this code
Use C43.111 when the record states malignant melanoma of the right upper eyelid, including the medial or lateral canthus. Apply it for confirmed primary melanoma at this exact anatomic site, not for suspected lesions or nonspecific eyelid skin cancers.
Do not use for
Do not use this code for melanoma of the left eyelid, lower eyelid, or other facial sites. It is also wrong for benign eyelid lesions, carcinoma in situ, or unspecified eyelid malignancy.
Coding tip
Verify laterality and eyelid subsite in the pathology or operative note before assigning the code.