| Billable | No — use a more specific child code |
| Chapter | Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99) |
| Section | Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46) |
| Parent code | R40.2 — Coma |
| 0 | unspecified time |
| 1 | in the field [EMT or ambulance] |
| 2 | at arrival to emergency department |
| 3 | at hospital admission |
| 4 | 24 hours or more after hospital admission |