Chronic multifocal osteomyelitis, unspecified ankle and foot

This code represents a persistent, widespread infection of the bone marrow and surrounding bone tissue within an unspecified ankle or foot. "Multifocal" indicates involvement in multiple, non-contiguous areas, while "chronic" signifies a long-standing or recurrent nature of the infection. This condition often results in bone destruction and can be challenging to treat.

Use this code when documentation clearly indicates chronic osteomyelitis affecting multiple sites within the ankle and/or foot, and the specific ankle/foot laterality (right or left) is not specified. This diagnosis is typically supported by imaging studies (e.g., X-ray, MRI, bone scan) showing multifocal bone involvement, along with clinical signs and symptoms of chronic infection.

• Ensure documentation specifies "chronic" and "multifocal" involvement; otherwise, consider acute or other specified forms of osteomyelitis.
• If the laterality (right or left ankle/foot) is documented, a more specific code should be used.
• Always sequence this code after any underlying cause or associated conditions, such as diabetes with osteomyelitis, if applicable.