ICD-10-CM > M00-M99 > M80-M85 > M85 > M85.0 > M85.04 M85.04 Fibrous dysplasia (monostotic), hand Non-Billable/Non-Specific Codes M85.041Fibrous dysplasia (monostotic), right handM85.042Fibrous dysplasia (monostotic), left handM85.049Fibrous dysplasia (monostotic), unspecified hand