ICD-10-CM > M00-M99 > M80-M85 > M85 > M85.5 > M85.55 M85.55 Aneurysmal bone cyst, thigh Non-Billable/Non-Specific Codes M85.551Aneurysmal bone cyst, right thighM85.552Aneurysmal bone cyst, left thighM85.559Aneurysmal bone cyst, unspecified thigh