ICD-10-CM diagnosis code
M66.10 Rupture of synovium, unspecified joint
- Billable
- Yes, a complete code (FY2026)
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Other codes in M66
103 complete codes in this category.
- M66.0Rupture of popliteal cyst
- M66.10Rupture of synovium, unspecified joint
- M66.111Rupture of synovium, right shoulder
- M66.112Rupture of synovium, left shoulder
- M66.119Rupture of synovium, unspecified shoulder
- M66.121Rupture of synovium, right elbow
- M66.122Rupture of synovium, left elbow
- M66.129Rupture of synovium, unspecified elbow
- M66.131Rupture of synovium, right wrist
- M66.132Rupture of synovium, left wrist
- M66.139Rupture of synovium, unspecified wrist
- M66.141Rupture of synovium, right hand
Documentation tips
- Make sure the note supports every element of the title, “Rupture of synovium, unspecified joint”: 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 M66.
The international WHO ICD-10 also has M66, 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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