ICD-10-CM > M00-M99 > M86-M90 > M86 > M86.6 > M86.67 M86.67 Other chronic osteomyelitis, ankle and foot Non-Billable/Non-Specific Codes M86.671Other chronic osteomyelitis, right ankle and footM86.672Other chronic osteomyelitis, left ankle and footM86.679Other chronic osteomyelitis, unspecified ankle and foot