Chronic osteomyelitis w draining sinus, right ankle and foot

This code signifies a persistent, long-standing infection of the bone in the right ankle and/or foot, characterized by the presence of a draining sinus tract. The sinus indicates a chronic inflammatory process where pus and debris are continuously discharged from the infected bone to the skin surface. This condition often results from inadequately treated acute osteomyelitis or open fractures.

Apply this code when documentation clearly indicates chronic osteomyelitis affecting the right ankle or foot, and specifically mentions the presence of a draining sinus. This typically arises in patients with recurrent infections, non-healing wounds, or persistent purulent discharge from the affected area. Supporting documentation should include physician notes detailing the chronicity, location, and the presence of a draining sinus.

• Ensure the documentation specifies "chronic" osteomyelitis and the presence of a "draining sinus" for accurate code assignment.
• Verify the laterality (right ankle/foot) is explicitly stated; do not assume.
• Differentiate from acute osteomyelitis (M86.1-) or osteomyelitis without a draining sinus (M86.6-).