ICD-10-CM diagnosis code
M85.00 Fibrous dysplasia (monostotic), unspecified site
- Billable
- Yes, a complete code (FY2026)
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Other codes in M85
169 complete codes in this category.
- M85.00Fibrous dysplasia (monostotic), unspecified site
- M85.011Fibrous dysplasia (monostotic), right shoulder
- M85.012Fibrous dysplasia (monostotic), left shoulder
- M85.019Fibrous dysplasia (monostotic), unspecified shoulder
- M85.021Fibrous dysplasia (monostotic), right upper arm
- M85.022Fibrous dysplasia (monostotic), left upper arm
- M85.029Fibrous dysplasia (monostotic), unspecified upper arm
- M85.031Fibrous dysplasia (monostotic), right forearm
- M85.032Fibrous dysplasia (monostotic), left forearm
- M85.039Fibrous dysplasia (monostotic), unspecified forearm
- M85.041Fibrous dysplasia (monostotic), right hand
- M85.042Fibrous dysplasia (monostotic), left hand
Documentation tips
- Make sure the note supports every element of the title, “Fibrous dysplasia (monostotic), unspecified site”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to M85.
The international WHO ICD-10 also has M85, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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