Top 25 ED diagnosis codes (SNOWMED codes) and ED diagnosis codes indicative of mTBI, for the overall mTBI cohort (confirmed mTBI cases, n=351; indeterminate mTBI, n=180)
| Top 25 ED diagnosis codes description | N | % |
| Injury of head (disorder) | 145 | 26.3 |
| Motor vehicle accident victim (finding) | 49 | 8.9 |
| Minor head injury (disorder) | 39 | 7.1 |
| Traumatic injury (disorder) | 37 | 6.7 |
| Falls (finding) | 35 | 6.4 |
| Concussion (disorder) | 26 | 4.7 |
| Headache (finding) | 11 | 2.0 |
| Facial laceration (disorder) | 10 | 1.8 |
| Victim of physical assault (finding) | 9 | 1.6 |
| Alcohol intoxication (disorder) | 8 | 1.5 |
| Falling injury (finding) | 8 | 1.5 |
| Fractured nasal bones (disorder) | 8 | 1.5 |
| Laceration of head (disorder) | 8 | 1.5 |
| Post-concussion syndrome (disorder) | 7 | 1.3 |
| Injury of face (disorder) | 6 | 1.1 |
| Subarachnoid haemorrhage (disorder) | 6 | 1.1 |
| Neck pain (finding) | 5 | 0.9 |
| Backache | 4 | 0.7 |
| Intracranial injury without skull fracture (disorder) | 4 | 0.7 |
| Laceration of forehead (disorder) | 4 | 0.7 |
| Closed fracture of clavicle (disorder) | 3 | 0.5 |
| Dizziness (finding) | 3 | 0.5 |
| Fracture of maxilla (disorder) | 3 | 0.5 |
| Fracture of rib (disorder) | 3 | 0.5 |
| Injury of neck (disorder) | 3 | 0.5 |
| ED diagnosis codes indicative of mTBI | ||
| Concussion (disorder) | 26 | 4.7 |
| Post-concussion syndrome (disorder) | 7 | 1.3 |
| Subarachnoid haemorrhage (disorder) | 6 | 1.1 |
| Intracranial injury without skull fracture (disorder) | 4 | 0.7 |
| Subdural haematoma (disorder) | 3 | 0.5 |
| Brief loss of consciousness (finding) | 2 | 0.4 |
| Cerebral haemorrhage (disorder) | 1 | 0.2 |
| Contusion of cerebrum (disorder) | 1 | 0.2 |
| Crushing injury of skull and intracranial contents (disorder) | 1 | 0.2 |
| Epidural haemorrhage (disorder) | 1 | 0.2 |
| Intracranial haemorrhage (disorder) | 1 | 0.2 |
| Loss of consciousness (finding) | 1 | 0.2 |
| Transient global amnesia (finding) | 1 | 0.2 |
| Traumatic subdural haemorrhage (disorder) | 1 | 0.2 |
ED, emergency department; mTBI, mild traumatic brain injury.