ICD-10-CM diagnosis code
S66.902D Unspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand, subsequent encounter
- Billable
- Yes, a complete code (FY2026)
Encounter (7th character)
This code is for a subsequent encounter: active treatment is complete and the patient is being seen during healing or recovery (for example a cast change, medication adjustment or follow-up visit).
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Other codes in S66
540 complete codes in this category.
- S66.899DOther injury of other specified muscles, fascia and tendons at wrist and hand level, unspecified hand, subsequent encounter
- S66.899SOther injury of other specified muscles, fascia and tendons at wrist and hand level, unspecified hand, sequela
- S66.901AUnspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, right hand, initial encounter
- S66.901DUnspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, right hand, subsequent encounter
- S66.901SUnspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, right hand, sequela
- S66.902AUnspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand, initial encounter
- S66.902DUnspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand, subsequent encounter
- S66.902SUnspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand, sequela
- S66.909AUnspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, initial encounter
- S66.909DUnspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, subsequent encounter
- S66.909SUnspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, sequela
- S66.911AStrain of unspecified muscle, fascia and tendon at wrist and hand level, right hand, initial encounter
Documentation tips
- Make sure the note supports every element of the title, “Unspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand, subsequent encounter”: 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 S66.
The international WHO ICD-10 also has S66, 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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