S99.921 (Unspecified injury of right foot) compared with S99.922 (Unspecified injury of left foot), from the official CMS tabular data. S99.921 and S99.922 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. S99.921 and S99.922 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.
| S99.921Unspecified injury of right foot | S99.922Unspecified injury of left foot | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | S00-T88 — Injury, poisoning and certain other consequences of external causes | S00-T88 — Injury, poisoning and certain other consequences of external causes |
| Definition | Unspecified injury of right foot is a non-billable ICD-10-CM category code (S99.921). | Unspecified injury of left foot is a non-billable ICD-10-CM category code (S99.922). |
| 7th character | The appropriate 7th character is to be added to each code from subcategory S99.9 | The appropriate 7th character is to be added to each code from subcategory S99.9 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources