Some 13 hospital staff in South Australia have been sanctioned after being caught accessing the medical records of the man accused of killing Adelaide Crows coach Phil Walsh in 2015.

His 27-year-old son Cy Walsh is awaiting trial after pleading not guilty by reason of mental incompetence to murdering Mr Walsh at his Somerton Park home in July.

A spokesperson for SA Health Minister Jack Snelling said an audit discovered the unauthorised privacy breaches by staff across the state hospital system.

SA Health chief executive David Swan said formal warnings had been issued to 13 staff members about inappropriately accessing patient records.

He would not confirm if those records belonged to Walsh.

“We are very disappointed in the unprofessional and inappropriate, and completely unacceptable behaviour of those 13 individual clinicians,” Mr Swan said.

He said the audit was conducted to check that only clinicians offering direct care of a patient were accessing records.

Phil Walsh, 55, was in his first year coaching the Adelaide Crows AFL side when he died from multiple stab wounds at his home.

His wife, Meredith, was taken to hospital and treated for a leg injury.

Their son remains detained at the secure psychiatric facility James Nash House near Yatala Labour Prison in northern Adelaide.

The case is expected to return to court on April 1 for a directions hearing.