Malignant melanoma of left upper limb, including shoulder

This code signifies a primary malignant melanoma originating on the left upper extremity, encompassing any part of the arm, forearm, hand, or the shoulder region itself. It specifies the cancerous growth of melanocytes, the pigment-producing cells, in this particular anatomical location.

Apply this code when documentation clearly states a diagnosis of malignant melanoma located on the patient's left arm, including the shoulder. This includes biopsy-confirmed cases or clinical diagnoses where the primary site is definitively identified as the left upper limb.

• Ensure laterality is explicitly documented as "left" for the upper limb.
• Distinguish from secondary malignant melanoma (metastatic) or melanoma in situ.
• Confirm the lesion is primary to the upper limb and not an extension from a trunk lesion.