Subacute osteomyelitis, left radius and ulna

This code signifies a bone infection affecting both the radius and ulna in the left forearm, characterized by a gradual onset and persistent symptoms over weeks or months, but not yet chronic. It involves inflammation of the bone and bone marrow due to bacterial, fungal, or other microbial invasion.

Apply this code when documentation specifies osteomyelitis of the left radius and ulna with a subacute presentation. This typically involves symptoms like localized pain, swelling, and warmth that have been present for an extended period (e.g., 2 weeks to 3 months) but without the severe systemic signs of acute infection or the long-standing bone changes of chronic osteomyelitis. Supporting documentation should include physician notes detailing the location, laterality, and subacute nature of the infection, often confirmed by imaging and/or cultures.

• Ensure documentation clearly specifies "subacute" to differentiate from acute (M86.1-) or chronic (M86.3-) osteomyelitis.
• Verify laterality; this code is specific to the left radius and ulna.
• Code any associated infectious organism (e.g., B95-B97) as an additional diagnosis if identified.