Melanoma in situ of unspecified part of face

This code describes a non-invasive malignant melanoma confined to the epidermis (in situ) located on an unspecified part of the patient's face. It signifies that the melanoma cells have not invaded beyond the basement membrane.

Use this code when documentation confirms a diagnosis of melanoma in situ on the face, but the specific anatomical subsite (e.g., eyelid, nose, lip) is not specified. Supporting documentation includes pathology reports confirming melanoma in situ and clinical notes indicating the facial location without further specificity.

• Do not use this code if the specific facial subsite is documented; instead, select a more precise code from the D03.3 subcategory.
• Ensure the pathology report explicitly states "in situ" to differentiate from invasive melanoma (C43.- codes).
• If laterality (right/left) is specified for a facial subsite, choose the appropriate laterality code.