S56 vs S66
S56 (Injury of muscle, fascia and tendon at forearm level) compared with S66 (Injury of muscle, fascia and tendon at wrist and hand level), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. S56 carries an Excludes2 note covering S66: “injury of muscle, fascia and tendon at or below wrist (S66.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| S56Injury of muscle, fascia and tendon at forearm level | S66Injury of muscle, fascia and tendon at wrist and hand level | |
|---|---|---|
| Billing status | Non-billable header Report instead: S56.001A, S56.001D, S56.001S, S56.002A, S56.002D | Non-billable header Report instead: S66.001A, S66.001D, S66.001S, S66.002A, S66.002D |
| Classification | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Injury of muscle, fascia and tendon at forearm level is a non-billable ICD-10-CM category code (S56). | Injury of muscle, fascia and tendon at wrist and hand level is a non-billable ICD-10-CM category code (S66). |
| 7th character | The appropriate 7th character is to be added to each code from category S56 | The appropriate 7th character is to be added to each code from category S66 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources