Chronic osteomyelitis with draining sinus, left humerus

This code signifies a persistent, long-standing infection of the bone in the left upper arm, specifically the humerus, which has progressed to form a chronic opening or tract that continuously discharges pus or fluid to the skin surface. This indicates a severe and often difficult-to-treat bone infection.

Apply this code when documentation clearly states chronic osteomyelitis affecting the left humerus, accompanied by evidence of a draining sinus. This is typically seen in patients with recurrent or refractory bone infections where surgical intervention or prolonged antibiotic therapy has been necessary.

• Ensure documentation specifies "chronic" osteomyelitis and the presence of a "draining sinus" for accurate code assignment.
• Laterality is crucial; verify the affected side (left humerus).
• Do not confuse with acute osteomyelitis (M86.0-) or osteomyelitis without a draining sinus (M86.6-).