| Full description | Toxic effect of carbon monoxide from unspecified source, accidental (unintentional) |
| Billable | No — use a more specific child code |
| Chapter | Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T88) |
| Section | Toxic effects of substances chiefly nonmedicinal as to source (T51-T65) |
| Parent code | T58.9 — Toxic effect of carbon monoxide from unspecified source |
| Requires 7th character | Yes |