ICD-10-CM > M00-M99 > M80-M85 > M85 > M85.0 > M85.07 M85.07 Fibrous dysplasia (monostotic), ankle and foot Non-Billable/Non-Specific Codes M85.071Fibrous dysplasia (monostotic), right ankle and footM85.072Fibrous dysplasia (monostotic), left ankle and footM85.079Fibrous dysplasia (monostotic), unspecified ankle and foot