ICD-10 Code C43.11 – Malignant melanoma of right eyelid, including canthus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C43.11 – Malignant melanoma of right eyelid, including canthus
What it is
C43.11 identifies a malignant melanoma located on the right eyelid, including the canthal area. Use this code for a primary skin cancer diagnosis documented on the right upper or lower eyelid or at the inner or outer canthus.
Clinical signs
Clinical features vary; refer to documentation. Melanoma may appear as a changing pigmented lesion, an asymmetric growth, irregular borders, or color variation on the eyelid or canthus.
When to use this code
Use C43.11 when the provider documents malignant melanoma of the right eyelid, with or without canthal involvement. It is appropriate when pathology, exam findings, or specialist assessment confirms the lesion site on the right side.
If the record only says “eyelid melanoma” without laterality, check documentation before coding. Use the specific site code when the right eyelid is clearly identified in the diagnosis or procedure note.
Do not use for
Do not use this code for benign eyelid lesions, nonmelanoma skin cancers, or melanoma on the left eyelid. If the site is unspecified or documentation is unclear, check documentation.
Coding tip
Verify laterality and anatomic site in the pathology or assessment note before assigning C43.11.