S56.21 — Strain of other flexor muscle, fascia and tendon at forearm level
Is S56.21 billable?
No — S56.21 is a non-billable header code. S56.21 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 9 billable codes beneath S56.21.
Billable codes under this header
- S56.211AStrain of other flexor muscle, fascia and tendon at forearm level, right arm, initial encounter
- S56.211DStrain of other flexor muscle, fascia and tendon at forearm level, right arm, subsequent encounter
- S56.211SStrain of other flexor muscle, fascia and tendon at forearm level, right arm, sequela
- S56.212AStrain of other flexor muscle, fascia and tendon at forearm level, left arm, initial encounter
- S56.212DStrain of other flexor muscle, fascia and tendon at forearm level, left arm, subsequent encounter
- S56.212SStrain of other flexor muscle, fascia and tendon at forearm level, left arm, sequela
- S56.219AStrain of other flexor muscle, fascia and tendon at forearm level, unspecified arm, initial encounter
- S56.219DStrain of other flexor muscle, fascia and tendon at forearm level, unspecified arm, subsequent encounter
- S56.219SStrain of other flexor muscle, fascia and tendon at forearm level, unspecified arm, sequela
S56.21 at a glance
| Code | S56.21 |
|---|---|
| Description | Strain of other flexor muscle, fascia and tendon at forearm level |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is S56.21 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to S56.21. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Injury › muscle › forearm › flexor › strain
Use additional code — inherited from Chapter 19
Report an additional code alongside S56.21 to fully describe the condition. S56.21 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 S56.21, but a patient may have both at the same time. When documentation supports it, S56.21 and the excluded code may both be reported.
Excludes2 — not included here — inherited from S50-S59
The conditions below are not part of S56.21, but a patient may have both at the same time. When documentation supports it, S56.21 and the excluded code may both be reported.
Excludes2 — not included here — inherited from S56
The conditions below are not part of S56.21, but a patient may have both at the same time. When documentation supports it, S56.21 and the excluded code may both be reported.
Code also — inherited from S56
Two codes may be needed to describe the condition fully. Whether S56.21 is sequenced first depends on the reason for the encounter.
- any associated open wound (S51.-)
What codes fall under S56.21? (3)
How long has S56.21 existed?
S56.21 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.