ICD-10-CM > M00-M99 > M80-M85 > M85 > M85.0 > M85.05 M85.05 Fibrous dysplasia (monostotic), thigh Non-Billable/Non-Specific Codes M85.051Fibrous dysplasia (monostotic), right thighM85.052Fibrous dysplasia (monostotic), left thighM85.059Fibrous dysplasia (monostotic), unspecified thigh