ICD-10 Code D03.112 – Melanoma in situ of right lower eyelid, including canthus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D03.112 – Melanoma in situ of right lower eyelid, including canthus
What it is
D03.112 identifies melanoma in situ limited to the right lower eyelid, including the canthal area. The lesion is confined to the epidermis and has not invaded deeper tissue.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include a suspicious pigmented or changing eyelid lesion, sometimes with irregular borders, color variation, or enlargement noted on exam.
When to use this code
Use this code when the record clearly states melanoma in situ of the right lower eyelid or right lower canthus. It is appropriate when pathology, specialist assessment, or operative documentation confirms the lesion is in situ and the anatomic site is specified.
If the chart only says melanoma of the eyelid without laterality or depth, check documentation before coding. You should also verify whether the canthus is included in the documented site.
Do not use for
Do not use this code for invasive melanoma, uncertain behavior lesions, or melanoma in other eyelid locations. Check documentation if the side or site is not clearly the right lower eyelid.
Coding tip
Always code laterality and exact eyelid location from the pathology or provider note before assigning D03.112.