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2025 ICD-10-CM code C43.8

Malignant melanoma of overlapping sites of skin. This refers to a primary malignant neoplasm that overlaps two or more contiguous sites of the skin.

Use C43.8 when melanoma involves overlapping skin sites. Do not use for non-contiguous lesions; code each site separately. For melanomas of the skin of genital organs, use C51-C52, C60.-, C63.-.

Medical necessity is established by the diagnosis of malignant melanoma. The size, location, and potential for spread justify treatment intervention.

Diagnosis involves physical examination, biopsy, and possibly imaging studies (CT, PET). Treatment may include surgical excision, lymph node dissection, and chemotherapy. Patient education on UV exposure and genetic risk factors is crucial.

In simple words: This code describes a type of skin cancer called melanoma that affects multiple areas of skin right next to each other.

Malignant melanoma of overlapping sites of the skin is a type of skin cancer that originates in melanocytes, the cells responsible for producing melanin (skin pigment).It is characterized by the uncontrolled growth of these cells, which can invade surrounding tissues and potentially metastasize to other parts of the body. This code (C43.8) specifically denotes that the melanoma involves two or more adjacent sites of the skin.

Example 1: A patient presents with a changing mole spanning two adjacent areas on their back, diagnosed as malignant melanoma., Melanoma originating on the shoulder extends to the upper arm and chest, requiring C43.8., A large irregular lesion on the scalp crosses from the forehead to the temple region, confirmed as malignant melanoma.

Documentation should include site, size, morphology, ulceration status, and involvement of adjacent sites. Biopsy results and imaging reports are essential.

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