An overseas trained doctor is under investigation by Queensland authorities after concerns were raised about his registration and performance.

In September, staff in Central Queensland discovered Dr John Chibanda had been convicted of falsifying a death certificate in Zimbabwe.

Dr Chibanda was practising at the Emerald Hospital in central Queensland.

Dr Tony O'Connell from Queensland Health says staff did not pass the information on until this week.

"That's an aspect which the Deputy Premier wants investigated by the Health Quality and Complaints Commission - are there systemic issues here," he said.

Health Minister Paul Lucas says patient files are being reviewed but no deaths have occurred.

Mr Lucas says an earlier internet search did not reveal the conviction.

"The medical board put in 'John Chibanda - discipline' and it didn't show up under that basis, but if one puts in 'John Chibanda' without putting anything else in it does," he said.

Dr Chibanda has declined to comment, but has told health authorities the conviction was quashed.

He is the second doctor to be stood down from the hospital in the past two months.

The Northern Territory Department of Health says Dr Chibanda worked as a medical officer at Katherine District Hospital for almost two years until he resigned in October 2007.

It says his conditions of employment included working under the supervision of senior medical staff.

The Department says during the time Dr Chibanda worked in the Territory no complaints about his work were made to the Northern Territory Medical Board.