Other chronic osteomyelitis, left tibia and fibula

This code signifies a persistent, long-standing infection of the bone and bone marrow affecting both the tibia and fibula in the patient's left lower leg. It indicates an osteomyelitis that has not resolved with acute treatment and has progressed to a chronic state, often characterized by recurrent symptoms or persistent inflammatory processes.

Use this code for patients diagnosed with chronic osteomyelitis specifically involving the left tibia and fibula. Documentation should clearly state the chronicity of the infection and specify the affected bones as the left tibia and fibula, often following an acute episode or trauma.

• Ensure documentation explicitly states "chronic" osteomyelitis and specifies both the left tibia and fibula.
• Distinguish from acute osteomyelitis (M86.1x) or osteomyelitis of other sites.
• Code any associated complications, such as sequestrum or involucrum, with additional appropriate codes.