ICD-10-CM > M00-M99 > M86-M90 > M86 > M86.6 > M86.66 M86.66 Other chronic osteomyelitis, tibia and fibula Non-Billable/Non-Specific Codes M86.661Other chronic osteomyelitis, right tibia and fibulaM86.662Other chronic osteomyelitis, left tibia and fibulaM86.669Other chronic osteomyelitis, unspecified tibia and fibula