Subacute osteomyelitis, left femur

This code signifies a bacterial or fungal infection of the left thigh bone (femur) that has progressed beyond the acute phase but has not yet become chronic. It involves inflammation and destruction of bone tissue, often presenting with persistent pain, swelling, and sometimes drainage.

Apply this code when documentation clearly indicates osteomyelitis affecting the left femur, with the physician specifically characterizing the infection as "subacute." This typically follows an acute infection that has not fully resolved but also hasn't reached a chronic, long-standing state. Supporting documentation would include imaging reports (X-ray, MRI), culture results, and physician notes detailing the duration and nature of the infection.

• Ensure the documentation explicitly states "subacute" and specifies the left femur. Do not assume subacute if only "osteomyelitis" is documented.
• Distinguish carefully between acute (M86.1-) and chronic (M86.3-) osteomyelitis of the femur, as these have distinct codes.
• Always code any associated infectious organism (e.g., B95-B97) as an additional diagnosis, if identified.