Chronic multifocal osteomyelitis, left ankle and foot

This code signifies a persistent, long-standing infection of multiple bone sites within the left ankle and foot. The infection is characterized by its chronic nature, meaning it has been present for an extended period, and its multifocal presentation, indicating involvement of more than one distinct bone area.

Apply this code when documentation clearly indicates a diagnosis of chronic osteomyelitis affecting multiple bones within the left ankle and foot. This diagnosis is typically supported by imaging studies (e.g., X-rays, MRI), bone biopsies, and clinical findings consistent with a long-term bone infection.

• Ensure documentation specifies "chronic" and "multifocal" involvement of the left ankle and foot.
• Distinguish from acute osteomyelitis (M86.1-) or osteomyelitis affecting a single site.
• Code any associated pathogens (e.g., B95-B97) as secondary diagnoses if identified.