Bali: An Australian man who faced up to 15 years jail in an Indonesian prison for bringing drugs into the country will instead spend less than a year in a Bali rehab centre.

Joshua James Baker was caught arriving at Ngurah Rai airport carrying a mixture of 28 grams of marijuana, tobacco and 37 pills of the prescription-only drug Diazepam in October last year.

The 32-year-old, who was born in Mt Isa, Queensland, would have faced a lengthy sentence if he had been found guilty of either importing drugs or the possession of drugs.

But on Tuesday head judge I Wayan Kawisada told the court the panel of three judges had decided the defendant was guilty of the lesser charge of illegal use of a category one narcotic for personal consumption and possession of psychotropic drugs.

"The panel of judges disagree with the prosecutor on the sentence because the defendant is a victim of narcotics and that he needed to be rehabilitated," Mr Kawisada said.