| Full description | Asphyxiation due to systemic oxygen deficiency due to low oxygen content in ambient air due to unspecified cause, initial encounter |
| Billable | Yes |
| Chapter | Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T88) |
| Section | Other and unspecified effects of external causes (T66-T78) |
| Parent code | T71.20 — Asphyx due to sys oxy defic due to low oxy in air unsp cause |