An Australian man is in an induced coma in a Bali hospital after a road accident while his family scrambles to raise funds for his medical evacuation.

Nicho White, 43, was riding a motorbike in the Kerobokan area in the early hours of Friday when he was hit by a car.

He remains in intensive care in a Denpasar hospital, which is costing his family, originally from Melbourne, up to $5000 a day.

Stepfather Ian McGill says attempts to bring Mr White out of the coma have so far been unsuccessful.

The once-fit surfer has serious head, chest and leg injuries and doctors say it will be best to medically evacuate him to Australia, at a cost of about $100,000.

“In the scheme if seriousness, I think the doctor said it’s the worst he’s seen in terms of possible brain injury,” Mr McGill told AAP on Tuesday.

“We really don’t know what the outcome will be.”

Mr White did not have medical insurance, and the other motorist who was involved is unable to contribute.

A fundraising page on the website youcaring.com has so far raised more than $42,000.

Mr McGill says support has come from Melbourne, where he and wife Lyn lived until two years ago, and Bali, a second home for years before that.

In Bali, Mr White designs jewellery and his sister Jessie is the founder of fashion label Shakuhachi, with stores in Bali and Australia.

There are reports the accident was a hit-and-run, however, Bali police have not confirmed they are treating it as such.