Chronic osteomyelitis w draining sinus, left radius and ulna

This code signifies a persistent infection of the bone in the left forearm (radius and ulna) that has progressed to a chronic state and is characterized by a draining sinus tract. This sinus is a pathological channel connecting the infected bone to the skin surface, allowing pus and debris to discharge.

Apply this code when documentation confirms chronic osteomyelitis affecting both the left radius and ulna, specifically noting the presence of a draining sinus. This typically follows an acute infection that failed to resolve, leading to persistent inflammation and bone destruction.

• Ensure documentation explicitly states "chronic" and identifies the "left radius and ulna" as the affected sites.
• The presence of a "draining sinus" is a key component for accurate code assignment.
• Distinguish from acute osteomyelitis (M86.0-) or osteomyelitis without a draining sinus (M86.6-).