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2025 ICD-10-CM code M86.662

Chronic osteomyelitis of the left tibia and fibula.This code specifies a type of chronic osteomyelitis not otherwise classified.

If applicable, use an external cause code following M86.662 to identify the cause of the osteomyelitis. Code any major osseous defects (M89.7-) if present.

Medical necessity for treatment is established by the confirmed diagnosis of chronic osteomyelitis, posing a threat to the patient's health and requiring intervention to prevent further complications.

Diagnosis involves patient history, physical exam, imaging (X-ray, MRI, bone scan), lab tests (CRP, ESR, WBC), and possibly bone biopsy. Treatment includes antibiotics, pain medication, and surgery (debridement, removal of infected hardware).

In simple words: This code represents a long-lasting bone infection in your left lower leg (the tibia and fibula bones).It's a type of bone infection that isn't described by other, more specific codes.

Other chronic osteomyelitis of the left tibia and fibula refers to a long-standing inflammation of the bone caused by an infection.The infection can be bacterial, fungal, or due to other infectious organisms. The infection may have spread to the bone from an open wound (such as a contaminated fracture), during surgery (such as a joint replacement), or from a blood infection.

Example 1: A patient with a history of open fracture of the left tibia and fibula now presents with persistent pain, swelling, and redness at the fracture site. Imaging reveals chronic osteomyelitis., A patient who underwent a previous left knee replacement now experiences pain, fever, and swelling in the left lower leg.Tests confirm chronic osteomyelitis, likely from a post-surgical infection., An immunocompromised patient presents with fever and left lower leg pain. Blood cultures and bone biopsy confirm chronic osteomyelitis in the left tibia and fibula.

Documentation should include evidence of chronic infection (e.g., duration, imaging results), location (left tibia and fibula), any associated symptoms, and treatment provided.

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