M21.751 (Unequal limb length (acquired), right femur) compared with M21.752 (Unequal limb length (acquired), left femur), from the official CMS tabular data. M21.751 and M21.752 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. M21.751 and M21.752 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.
| M21.751Unequal limb length (acquired), right femur | M21.752Unequal limb length (acquired), left femur | |
|---|---|---|
| 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 | Unequal limb length (acquired), right femur is a billable ICD-10-CM diagnosis code (M21.751). | Unequal limb length (acquired), left femur is a billable ICD-10-CM diagnosis code (M21.752). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources