ICD-10-CM diagnosis code
M65.939 Unspecified synovitis and tenosynovitis, unspecified forearm
- 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.
- M65.919Unspecified synovitis and tenosynovitis, unspecified shoulder
- M65.921Unspecified synovitis and tenosynovitis, right upper arm
- M65.922Unspecified synovitis and tenosynovitis, left upper arm
- M65.929Unspecified synovitis and tenosynovitis, unspecified upper arm
- M65.931Unspecified synovitis and tenosynovitis, right forearm
- M65.932Unspecified synovitis and tenosynovitis, left forearm
- M65.939Unspecified synovitis and tenosynovitis, unspecified forearm
- M65.941Unspecified synovitis and tenosynovitis, right hand
- M65.942Unspecified synovitis and tenosynovitis, left hand
- M65.949Unspecified synovitis and tenosynovitis, unspecified hand
- M65.951Unspecified synovitis and tenosynovitis, right thigh
- M65.952Unspecified synovitis and tenosynovitis, left thigh
Documentation tips
- Make sure the note supports every element of the title, “Unspecified synovitis and tenosynovitis, unspecified forearm”: 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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