Subacute osteomyelitis, left humerus

This code signifies a subacute infection of the bone marrow and surrounding bone tissue specifically affecting the left upper arm bone (humerus). Subacute indicates an infection that has been present for a longer duration than acute but is not yet chronic, often with less severe or more indolent symptoms. The infection can be bacterial, fungal, or mycobacterial.

Use this code when documentation clearly states subacute osteomyelitis localized to the left humerus. This typically applies to patients presenting with persistent bone pain, swelling, or tenderness in the left upper arm, often following trauma, surgery, or hematogenous spread, where imaging (X-ray, MRI, bone scan) and laboratory findings (elevated ESR, CRP, positive cultures) confirm the diagnosis.

• Ensure the documentation specifies "subacute" and not acute or chronic osteomyelitis, as different codes apply.
• Verify the laterality (left) and the specific bone (humerus) are clearly documented.
• Always look for an underlying cause or infectious agent, if identified, to code additional diagnoses.