ICD-10-CM > M00-M99 > M86-M90 > M90 > M90.5 > M90.55 M90.55 Osteonecrosis in diseases classified elsewhere, thigh Non-Billable/Non-Specific Codes M90.551Osteonecrosis in diseases classified elsewhere, right thighM90.552Osteonecrosis in diseases classified elsewhere, left thighM90.559Osteonecrosis in diseases classified elsewhere, unspecified thigh