M21.721 (Unequal limb length (acquired), right humerus) compared with M21.722 (Unequal limb length (acquired), left humerus), from the official CMS tabular data. M21.721 and M21.722 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. M21.721 and M21.722 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.
| M21.721Unequal limb length (acquired), right humerus | M21.722Unequal limb length (acquired), left humerus | |
|---|---|---|
| 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 humerus is a billable ICD-10-CM diagnosis code (M21.721). | Unequal limb length (acquired), left humerus is a billable ICD-10-CM diagnosis code (M21.722). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources