Merkel cell carcinoma of right upper limb, inc shoulder

This code signifies a rare and aggressive neuroendocrine tumor of the skin, specifically Merkel cell carcinoma, located on the patient's right upper extremity. This includes any involvement of the right arm, forearm, hand, or shoulder region.

Apply this code when documentation clearly states a confirmed diagnosis of Merkel cell carcinoma affecting the right upper limb or shoulder. This diagnosis is typically established through biopsy and histopathological examination.

• Ensure laterality is explicitly documented as "right" upper limb or shoulder.
• Distinguish from other skin malignancies like melanoma or squamous cell carcinoma.
• Confirm the diagnosis is definitively Merkel cell carcinoma, not a suspected or rule-out diagnosis.