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2025 ICD-10-CM code C43.5

Malignant melanoma of the trunk.

Use C43.5 for primary malignant melanoma originating on the trunk, excluding the anus and scrotum.If the melanoma overlaps contiguous sites on the trunk, use code C43.8.Do not use C43.5 for in situ melanoma (D03.-) or melanoma of the skin of the genital organs (C51-C52, C60.-, C63.-). Use additional codes to specify any associated functional activity (Chapter 4) or any contributing factors.

Medical necessity for services related to C43.5 is established by the diagnosis of malignant melanoma.Treatment is necessary to remove the cancerous lesion, prevent its spread, and improve the patient's prognosis.

Diagnosis of malignant melanoma of the trunk involves a thorough physical examination, including a full-body skin check and assessment of any moles or lesions.Doctors look for asymmetry, irregular borders, color variation, a diameter greater than 6 mm, and any evolution or changes in existing moles.Diagnostic tests include a complete blood count, serum chemistry tests (including ALT and AST), lactate dehydrogenase level, and a biopsy of the suspicious lesion.Imaging studies such as CT and PET scans might be used to determine the extent of the disease.

In simple words: Malignant melanoma of the trunk is a type of skin cancer that develops from the cells that produce melanin (the pigment that gives skin its color).It occurs on the torso (chest, back, abdomen), excluding specific areas like the anus and scrotum.It's crucial to detect melanoma early because it can spread to other parts of the body if left untreated.

Malignant melanoma of the trunk (excluding the anus and scrotum).

Example 1: A 55-year-old man presents with a changing mole on his back.The mole is asymmetrical, has irregular borders, and varies in color. A biopsy confirms malignant melanoma., A 30-year-old woman with a family history of melanoma notices a new, rapidly growing mole on her abdomen. It is dark black and has a diameter of 8 mm.Diagnosis confirms malignant melanoma of the trunk., A 70-year-old man with a history of multiple sunburns develops a scaly, red patch on his chest.The lesion is biopsied, and the pathology report reveals malignant melanoma.

Documentation for C43.5 should include detailed information about the lesion's location on the trunk, size, color, shape, borders, and any changes observed.The biopsy report confirming the diagnosis of malignant melanoma should be included, along with any imaging reports, laboratory test results, and details about the patient's history, including sun exposure, family history of melanoma, and any previous skin cancers.

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