M79.A21 (Nontraumatic compartment syndrome of right lower extremity) compared with M79.A29 (Nontraumatic compartment syndrome of unspecified lower extremity), from the official CMS tabular data. M79.A21 and M79.A29 code the same condition on opposite sides. MedCoder-derived
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. M79.A21 and M79.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.
| M79.A21Nontraumatic compartment syndrome of right lower extremity | M79.A29Nontraumatic compartment syndrome of unspecified lower extremity | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Nontraumatic compartment syndrome of right lower extremity is a billable ICD-10-CM diagnosis code (M79.A21). | Nontraumatic compartment syndrome of unspecified lower extremity is a billable ICD-10-CM diagnosis code (M79.A29). |
| Code first | , if applicable, associated postprocedural complication | , if applicable, associated postprocedural complication |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources