Chronic multifocal osteomyelitis, left radius and ulna

This code signifies a persistent, long-term infection of multiple bone sites within the left radius and ulna. This chronic condition often involves recurrent inflammation, bone destruction, and the potential for sequestra (dead bone fragments) or involucrum (new bone formation around infected bone).

Apply this code when documentation clearly indicates a chronic, multifocal osteomyelitis affecting both the radius and ulna of the left arm. This diagnosis is typically supported by imaging studies (e.g., X-rays, MRI), laboratory findings (e.g., elevated inflammatory markers), and clinical signs of persistent infection.

• Ensure documentation specifies "chronic" and "multifocal" involvement of both the radius and ulna.
• Distinguish from acute osteomyelitis (M86.1-) or subacute osteomyelitis (M86.2-).
• Verify laterality; this code is specific to the left arm.