ICD-10-CM diagnosis code
M60.9 Myositis, unspecified
- Billable
- Yes, a complete code (FY2026)
- Category
- M60 Myositis
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Other codes in M60
111 complete codes in this category.
- M60.851Other myositis, right thigh
- M60.852Other myositis, left thigh
- M60.859Other myositis, unspecified thigh
- M60.861Other myositis, right lower leg
- M60.862Other myositis, left lower leg
- M60.869Other myositis, unspecified lower leg
- M60.871Other myositis, right ankle and foot
- M60.872Other myositis, left ankle and foot
- M60.879Other myositis, unspecified ankle and foot
- M60.88Other myositis, other site
- M60.89Other myositis, multiple sites
- M60.9Myositis, unspecified
Documentation tips
- Make sure the note supports every element of the title, “Myositis, unspecified”: 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 M60.
The international WHO ICD-10 also has M60.9, 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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