T79.A12A (Traumatic compartment syndrome of left upper extremity, initial encounter) compared with T79.A19A (Traumatic compartment syndrome of unspecified upper extremity, initial encounter), from the official CMS tabular data. T79.A12A and T79.A19A 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.A12A and T79.A19A 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.A12ATraumatic compartment syndrome of left upper extremity, initial encounter | T79.A19ATraumatic compartment syndrome of unspecified upper extremity, initial encounter | |
|---|---|---|
| Billing status | Billable | Billable |
| 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 left upper extremity, initial encounter is a billable ICD-10-CM diagnosis code (T79.A12A). | Traumatic compartment syndrome of unspecified upper extremity, initial encounter is a billable ICD-10-CM diagnosis code (T79.A19A). |
| 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