Final answer:
Melanoma is a deadly form of skin cancer that develops from a mole. Wide excision is a common treatment, and the procedure and diagnosis codes for this specific case are 172.6 and 195.4, respectively.
Step-by-step explanation:
Melanoma is a cancer characterized by the uncontrolled growth of melanocytes, the pigment-producing cells in the epidermis. It is the most fatal of all skin cancers and typically develops from a mole. In the case of a wide excision of a 0.65-cm malignant melanoma from the right forearm, the procedure code reported would be 172.6 for malignant melanoma of the skin in the upper limb, including the shoulder, and the diagnosis code would be 195.4 for malignant neoplasm of the upper limb.