ICD-10-CM diagnosis code
M65.99 Unspecified synovitis and tenosynovitis, multiple sites
- Billable
- Yes, a complete code (FY2026)
- Category
- M65 Synovitis and tenosynovitis
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Other codes in M65
133 complete codes in this category.
- M65.949Unspecified synovitis and tenosynovitis, unspecified hand
- M65.951Unspecified synovitis and tenosynovitis, right thigh
- M65.952Unspecified synovitis and tenosynovitis, left thigh
- M65.959Unspecified synovitis and tenosynovitis, unspecified thigh
- M65.961Unspecified synovitis and tenosynovitis, right lower leg
- M65.962Unspecified synovitis and tenosynovitis, left lower leg
- M65.969Unspecified synovitis and tenosynovitis, unspecified lower leg
- M65.971Unspecified synovitis and tenosynovitis, right ankle and foot
- M65.972Unspecified synovitis and tenosynovitis, left ankle and foot
- M65.979Unspecified synovitis and tenosynovitis, unspecified ankle and foot
- M65.98Unspecified synovitis and tenosynovitis, other site
- M65.99Unspecified synovitis and tenosynovitis, multiple sites
Documentation tips
- Make sure the note supports every element of the title, “Unspecified synovitis and tenosynovitis, multiple sites”: 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 M65.
The international WHO ICD-10 also has M65, 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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