T79.A21 (Traumatic compartment syndrome of right lower extremity) compared with T79.A29 (Traumatic compartment syndrome of unspecified lower extremity), from the official CMS tabular data. T79.A21 and T79.A29 code the same condition on opposite sides.
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. T79.A21 and T79.A29 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| T79.A21Traumatic compartment syndrome of right lower extremity | T79.A29Traumatic compartment syndrome of unspecified lower extremity | |
|---|---|---|
| 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 | Traumatic compartment syndrome of right lower extremity is a non-billable ICD-10-CM category code (T79.A21). | Traumatic compartment syndrome of unspecified lower extremity is a non-billable ICD-10-CM category code (T79.A29). |
| 7th character | The appropriate 7th character is to be added to each code from category T79 | The appropriate 7th character is to be added to each code from category T79 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources