S66.4 — Injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level
Not billable
Is S66.4 billable?
No — S66.4 is a non-billable header code. S66.4 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 36 billable codes beneath S66.4.
Billable codes under this header
- S66.401AUnspecified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter
- S66.401DUnspecified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter
- S66.401SUnspecified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, sequela
- S66.402AUnspecified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level, initial encounter
- S66.402DUnspecified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level, subsequent encounter
- S66.402SUnspecified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level, sequela
- S66.409AUnspecified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounter
- S66.409DUnspecified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter
- S66.409SUnspecified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, sequela
- S66.411AStrain of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter
- S66.411DStrain of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter
- S66.411SStrain of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, sequela
- S66.412AStrain of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level, initial encounter
- S66.412DStrain of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level, subsequent encounter
- S66.412SStrain of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level, sequela
- S66.419AStrain of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounter
- S66.419DStrain of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter
- S66.419SStrain of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, sequela
- S66.421ALaceration of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter
- S66.421DLaceration of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter
- S66.421SLaceration of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, sequela
- S66.422ALaceration of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level, initial encounter
- S66.422DLaceration of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level, subsequent encounter
- S66.422SLaceration of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level, sequela
- S66.429ALaceration of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounter
- S66.429DLaceration of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter
- S66.429SLaceration of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, sequela
- S66.491AOther specified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter
- S66.491DOther specified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter
- S66.491SOther specified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level, sequela
- S66.492AOther specified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level, initial encounter
- S66.492DOther specified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level, subsequent encounter
- S66.492SOther specified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level, sequela
- S66.499AOther specified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounter
- S66.499DOther specified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter
- S66.499SOther specified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level, sequela
S66.4 at a glance
| Code | S66.4 |
|---|---|
| Description | Injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Use additional code — inherited from Chapter 19
Report an additional code alongside S66.4 to fully describe the condition. S66.4 is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of S66.4, but a patient may have both at the same time. When documentation supports it, S66.4 and the excluded code may both be reported.
Excludes2 — not included here — inherited from S60-S69
The conditions below are not part of S66.4, but a patient may have both at the same time. When documentation supports it, S66.4 and the excluded code may both be reported.
Excludes2 — not included here — inherited from S66
The conditions below are not part of S66.4, but a patient may have both at the same time. When documentation supports it, S66.4 and the excluded code may both be reported.
- sprain of joints and ligaments of wrist and hand (S63.-)
Code also — inherited from S66
Two codes may be needed to describe the condition fully. Whether S66.4 is sequenced first depends on the reason for the encounter.
- any associated open wound (S61.-)
What codes fall under S66.4? (4)
- S66.40Unspecified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand levelnot billable
- S66.41Strain of intrinsic muscle, fascia and tendon of thumb at wrist and hand levelnot billable
- S66.42Laceration of intrinsic muscle, fascia and tendon of thumb at wrist and hand levelnot billable
- S66.49Other specified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand levelnot billable
How long has S66.4 existed?
S66.4 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
What other codes are in the S66 family? (7)
- S66.0Injury of long flexor muscle, fascia and tendon of thumb at wrist and hand levelnot billable
- S66.1Injury of flexor muscle, fascia and tendon of other and unspecified finger at wrist and hand levelnot billable
- S66.2Injury of extensor muscle, fascia and tendon of thumb at wrist and hand levelnot billable
- S66.3Injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand levelnot billable
- S66.5Injury of intrinsic muscle, fascia and tendon of other and unspecified finger at wrist and hand levelnot billable
- S66.8Injury of other specified muscles, fascia and tendons at wrist and hand levelnot billable
- S66.9Injury of unspecified muscle, fascia and tendon at wrist and hand levelnot billable