ICD-10-CM > M00-M99 > M86-M90 > M86 > M86.4 > M86.46 M86.46 Chronic osteomyelitis with draining sinus, tibia and fibula Non-Billable/Non-Specific Codes M86.461Chronic osteomyelitis with draining sinus, right tibia and fibulaM86.462Chronic osteomyelitis with draining sinus, left tibia and fibulaM86.469Chronic osteomyelitis with draining sinus, unspecified tibia and fibula