S66
ICD-10Non-billable categoryInjury of muscle, fascia and tendon at wrist and hand level
Official ICD-10-CM descriptor (FY2026)
Injury of muscle, fascia and tendon at wrist and hand level
S66 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- sprain of joints and ligaments of wrist and hand (S63.-)
Code also
Two codes may be needed; sequencing depends on the reason for the encounter.
- any associated open wound (S61.-)
7th character
- The appropriate 7th character is to be added to each code from category S66
Permitted 7th characters
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |
More specific codes under S66
- S66.0Injury of long flexor musc/fasc/tend thumb at wrs/hnd lvcategory
- S66.1Inj flexor musc/fasc/tend and unsp finger at wrs/hnd lvcategory
- S66.2Injury of extensor musc/fasc/tend thumb at wrs/hnd lvcategory
- S66.3Inj extensor musc/fasc/tend and unsp finger at wrs/hnd lvcategory
- S66.4Injury of intrinsic musc/fasc/tend thumb at wrs/hnd lvcategory
- S66.5Inj intrinsic musc/fasc/tend and unsp finger at wrs/hnd lvcategory
- S66.8Injury of musc/fasc/tend at wrist and hand levelcategory
- S66.9Injury of unsp musc/fasc/tend at wrist and hand levelcategory
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.