Perth identity John Kizon is in intensive care after crashing his car outside Sir Charles Gairdner Hospital during an alleged medical episode.

A police spokesman said the 56-year-old smashed his BMW into a parked vehicle before travelling through several bollards and colliding with a tree around 9.30pm Tuesday night.

John Kizon is in hospital following a car accident Credit:Rania Spooner

Radio 6PR reported he was on his way to the hospital's emergency department.

Mr Kizon was admitted to Sir Charles Gairdner Hospital in critical condition.