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
S66.4 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
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
Related codes at this level
Codes that share S66. If S66.4 is not quite right, the correct code is usually one of these.
- 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
Questions about S66.4
- Is S66.4 a billable ICD-10-CM code?
- No. S66.4 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does S66.4 sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the wrist, hand and fingers (S60-S69).