Osteolysis, left upper arm

This code signifies the pathological destruction or dissolution of bone tissue specifically located in the patient's left upper arm (humerus). This process can lead to bone weakening, pain, and increased fracture risk, often resulting from various underlying conditions.

Apply this code when documentation explicitly states osteolysis affecting the left upper arm. This diagnosis is typically supported by imaging studies (e.g., X-rays, MRI) demonstrating bone resorption or lytic lesions, often in conjunction with clinical findings such as localized pain or swelling.

• Ensure laterality is clearly documented as "left upper arm" to support this specific code.
• Investigate the underlying cause of the osteolysis, if known, and code it as a primary diagnosis if applicable, with osteolysis as a secondary condition.
• Do not confuse with osteonecrosis, which involves bone death due to insufficient blood supply, rather than active bone resorption.