ICD-10-CM > M00-M99 > M86-M90 > M90 > M90.5 > M90.57 M90.57 Osteonecrosis in diseases classified elsewhere, ankle and foot Non-Billable/Non-Specific Codes M90.571Osteonecrosis in diseases classified elsewhere, right ankle and footM90.572Osteonecrosis in diseases classified elsewhere, left ankle and footM90.579Osteonecrosis in diseases classified elsewhere, unspecified ankle and foot