S66.4
S66.4: Injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level
Non-billable headerICD-10-CM
S66.4 is a non-billable header ICD-10-CM code for injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.
This code requires a 7th character
The appropriate 7th character is to be added to each code from category S66
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead S66.4
4 child codes. Green means billable.
- S66.40Unspecified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level
- S66.41Strain of intrinsic muscle, fascia and tendon of thumb at wrist and hand level
- S66.42Laceration of intrinsic muscle, fascia and tendon of thumb at wrist and hand level
- S66.49Other specified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level
Other codes under S66
- S66.0Injury of long flexor muscle, fascia and tendon of thumb at wrist and hand level
- S66.1Injury of flexor muscle, fascia and tendon of other and unspecified finger at wrist and hand level
- S66.2Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level
- S66.3Injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level
- S66.5Injury of intrinsic muscle, fascia and tendon of other and unspecified finger at wrist and hand level
- S66.8Injury of other specified muscles, fascia and tendons at wrist and hand level
- S66.9Injury of unspecified muscle, fascia and tendon at wrist and hand level