Melanoma in situ of right ear and external auricular canal

This code signifies the presence of a non-invasive malignant melanoma confined to the epidermis (in situ) located specifically on the patient's right ear, including the external auditory canal. It indicates that the cancerous cells have not yet invaded deeper tissues.

Apply this code when documentation confirms a diagnosis of melanoma in situ affecting the right ear or its external canal, typically identified through biopsy and histopathological examination. This diagnosis often follows the excision of a suspicious lesion.

• Ensure the documentation explicitly states "in situ" and specifies the right ear or external auricular canal.
• Do not use this code for invasive melanoma; refer to codes in the C43 series for invasive forms.
• Verify laterality (right vs. left) is clearly documented to avoid coding errors.