Chronic osteomyelitis with draining sinus, unspecified femur

This code signifies a long-standing, persistent infection of the bone in an unspecified femur, characterized by the presence of a draining tract or fistula that allows pus or other inflammatory exudates to escape. This chronic inflammatory process indicates a failure of acute infection to resolve, leading to ongoing bone destruction and drainage.

Apply this code when documentation explicitly states chronic osteomyelitis affecting the femur, along with evidence of a draining sinus. This typically follows an acute osteomyelitis episode or trauma, and is supported by imaging (e.g., X-ray, MRI) showing bone changes consistent with chronic infection and clinical notes describing persistent drainage from the affected area.

• Ensure documentation specifies "chronic" osteomyelitis and the presence of a "draining sinus" for accurate code assignment.
• Avoid using this code for acute osteomyelitis or chronic osteomyelitis without a draining sinus; separate codes exist for those conditions.
• If the specific femur (left or right) is documented, use the more specific code (M86.451 or M86.452) instead of this unspecified option.