S66.999 — Other injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand
Is S66.999 billable?
No — S66.999 is a non-billable header code. S66.999 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 3 billable codes beneath S66.999.
Billable codes under this header
- S66.999AOther injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, initial encounter
- S66.999DOther injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, subsequent encounter
- S66.999SOther injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, sequela
S66.999 at a glance
| Code | S66.999 |
|---|---|
| Description | Other injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is S66.999 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under S66.99, the nearest indexed parent of S66.999. Use them to find the family, then select the specific code.
- Injury › muscle › hand › specified › type NEC
Use additional code — inherited from Chapter 19
Report an additional code alongside S66.999 to fully describe the condition. S66.999 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 S66.999, but a patient may have both at the same time. When documentation supports it, S66.999 and the excluded code may both be reported.
Excludes2 — not included here — inherited from S60-S69
The conditions below are not part of S66.999, but a patient may have both at the same time. When documentation supports it, S66.999 and the excluded code may both be reported.
Excludes2 — not included here — inherited from S66
The conditions below are not part of S66.999, but a patient may have both at the same time. When documentation supports it, S66.999 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 S66.999 is sequenced first depends on the reason for the encounter.
- any associated open wound (S61.-)
What codes fall under S66.999? (3)
- S66.999AOther injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, initial encounter
- S66.999DOther injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, subsequent encounter
- S66.999SOther injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand, sequela
How long has S66.999 existed?
S66.999 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.