ICD-10-CM > M00-M99 > M86-M90 > M86 > M86.4 > M86.47 M86.47 Chronic osteomyelitis with draining sinus, ankle and foot Non-Billable/Non-Specific Codes M86.471Chronic osteomyelitis with draining sinus, right ankle and footM86.472Chronic osteomyelitis with draining sinus, left ankle and footM86.479Chronic osteomyelitis with draining sinus, unspecified ankle and foot