ICD-10-CM > M00-M99 > M86-M90 > M88 > M88.8 > M88.87 M88.87 Osteitis deformans of ankle and foot Non-Billable/Non-Specific Codes M88.871Osteitis deformans of right ankle and footM88.872Osteitis deformans of left ankle and footM88.879Osteitis deformans of unspecified ankle and foot