S66.2 vs S66.3
S66.2 (Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level) compared with S66.3 (Injury of extensor muscle, fascia and tendon of other and unspecified finger 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. S66.3 carries an Excludes2 note covering S66.2: “Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level (S66.2-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| 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 | |
|---|---|---|
| Billing status | Non-billable header Report instead: S66.201A, S66.201D, S66.201S, S66.202A, S66.202D | Non-billable header Report instead: S66.300A, S66.300D, S66.300S, S66.301A, S66.301D |
| 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 extensor muscle, fascia and tendon of thumb at wrist and hand level is a non-billable ICD-10-CM category code (S66.2). | Injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level is a non-billable ICD-10-CM category code (S66.3). |
| 7th character | The appropriate 7th character is to be added to each code from category S66 | 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