The claimant applied for a CAT determination based on GCS. The insurer denied the determination based on a paper review of a neurologist. Adjudicator Bickley reviewed the medical evidence, which included two ambulance call reports both showing GCS scores of 15. However, during the course of hospitalization, the claimant scored GCS scores of 7, 8, and 9 at various hours. The insurer argued the sub-9 scores were due to medication and intubation and not a reflection of a brain injury. Adjudicator Bickley concluded the claimant’s diagnosed concussion constituted a brain impairment, which resulted in a subsequent intubation, which caused a sub-9 GCS. Relying on the Ontario Court of Appeal decision in Liu v 1226071 Ontario Inc., it was concluded the claimant sustained a catastrophic impairment, since scores of 9 or less were recorded in a reasonable time following the accident.