ICD-10-CM diagnosis code
M66.249 Spontaneous rupture of extensor tendons, unspecified hand
- Billable
- Yes, a complete code (FY2026)
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Other codes in M66
103 complete codes in this category.
- M66.229Spontaneous rupture of extensor tendons, unspecified upper arm
- M66.231Spontaneous rupture of extensor tendons, right forearm
- M66.232Spontaneous rupture of extensor tendons, left forearm
- M66.239Spontaneous rupture of extensor tendons, unspecified forearm
- M66.241Spontaneous rupture of extensor tendons, right hand
- M66.242Spontaneous rupture of extensor tendons, left hand
- M66.249Spontaneous rupture of extensor tendons, unspecified hand
- M66.251Spontaneous rupture of extensor tendons, right thigh
- M66.252Spontaneous rupture of extensor tendons, left thigh
- M66.259Spontaneous rupture of extensor tendons, unspecified thigh
- M66.261Spontaneous rupture of extensor tendons, right lower leg
- M66.262Spontaneous rupture of extensor tendons, left lower leg
Documentation tips
- Make sure the note supports every element of the title, “Spontaneous rupture of extensor tendons, unspecified hand”: 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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