ICD-10-CM > M00-M99 > M80-M85 > M85 > M85.0 > M85.06 M85.06 Fibrous dysplasia (monostotic), lower leg Non-Billable/Non-Specific Codes M85.061Fibrous dysplasia (monostotic), right lower legM85.062Fibrous dysplasia (monostotic), left lower legM85.069Fibrous dysplasia (monostotic), unspecified lower leg