M20.20 (Hallux rigidus, unspecified foot) compared with M20.22 (Hallux rigidus, left foot), from the official CMS tabular data. M20.20 and M20.22 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. M20.20 and M20.22 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.
| M20.20Hallux rigidus, unspecified foot | M20.22Hallux rigidus, left foot | |
|---|---|---|
| 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 | Hallux rigidus, unspecified foot is a billable ICD-10-CM diagnosis code (M20.20). | Hallux rigidus, left foot is a billable ICD-10-CM diagnosis code (M20.22). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources