S04.812 (Injury of olfactory [1st ] nerve, left side) compared with S04.819 (Injury of olfactory [1st ] nerve, unspecified side), from the official CMS tabular data. S04.812 and S04.819 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. S04.812 and S04.819 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.
| S04.812Injury of olfactory [1st ] nerve, left side | S04.819Injury of olfactory [1st ] nerve, unspecified side | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Injury of olfactory [1st ] nerve, left side is a non-billable ICD-10-CM category code (S04.812). | Injury of olfactory [1st ] nerve, unspecified side is a non-billable ICD-10-CM category code (S04.819). |
| 7th character | The appropriate 7th character is to be added to each code from category S04 | The appropriate 7th character is to be added to each code from category S04 |
| Includes | injuries of ear injuries of eye injuries of face [any part] injuries of gum | injuries of ear injuries of eye injuries of face [any part] injuries of gum |
| Code first | any associated intracranial injury (S06.-) | any associated intracranial injury (S06.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources