Other acute osteomyelitis, left tibia and fibula

This diagnosis code signifies an acute inflammatory process of the bone and bone marrow affecting the left lower leg, specifically the tibia and fibula, that is not due to a hematogenous spread. It indicates a sudden onset infection, often bacterial, within these bones.

Apply this code when documentation clearly states acute osteomyelitis involving the left tibia and fibula, and specifies that the etiology is not hematogenous. This is typically seen following trauma, open fractures, or surgical interventions where direct inoculation of bacteria has occurred. Supporting documentation would include imaging reports (X-ray, MRI, bone scan) confirming osteomyelitis and clinical notes detailing acute symptoms like pain, swelling, and fever localized to the left lower leg.

• Ensure the documentation explicitly states "acute" and specifies "left tibia and fibula" to support this code.
• Distinguish from chronic osteomyelitis (M86.6-) or osteomyelitis due to hematogenous spread (M86.2-).
• Always code the underlying cause of the osteomyelitis (e.g., open fracture, surgical complication) if known and applicable, following sequencing guidelines.