S66.21 (Strain of extensor muscle, fascia and tendon of thumb at wrist and hand level) compared with T32 (Corrosions classified according to extent of body surface involved), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Distinct conditions — both may be reported.
“burns and corrosions (T20-T32)”
An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.
Source: CMS ICD-10-CM tabular instructional notes
Yes, when both are documented. S66.21 carries an Excludes2 note covering T32: “burns and corrosions (T20-T32)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
| S66.21Strain of extensor muscle, fascia and tendon of thumb at wrist and hand level | T32Corrosions classified according to extent of body surface involved | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| 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 | Strain of extensor muscle, fascia and tendon of thumb at wrist and hand level is a non-billable ICD-10-CM category code (S66.21). | Corrosions classified according to extent of body surface involved is a non-billable ICD-10-CM category code (T32). |
| 7th character | 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