| Full description | Toxic effect of hydrogen cyanide, undetermined, initial encounter |
| Billable | Yes |
| 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 | T57.3X4 — Toxic effect of hydrogen cyanide, undetermined |