Medicaid director Dr Carl Grace said his bulk-billing clinics in Ballarat and Geelong would be closed for one day while he attended a Doctors Action Group meeting in Sydney.

About 200 GPs from around the nation are expected to attend the meeting, organised by Penrith GP Dr Adrian Sheen.

The GP Super Clinics, one of which is in Ballan, combine GPs and allied health professionals in a one-stop health-care shop.

"We are concerned at the public not being informed about changes in the health care system," Dr Grace said.

"The government is spending $300 million on bulk-billing clinics that will detract from single GP practices that have been there for 100 years.

"It will send some small practices to the wall."

Dr Grace said a Federal Government proposal to set up nurses as practitioners able to prescribe medicine and order tests was also concerning GPs.

"It's time everyone knew what (Health Minister) Nicola Roxon is doing.

"For centuries, GPs have been giving the best health care to people."

Dr Sheen said he was concerned the 36 GP Super Clinics would affect privacy and the doctor-patient relationship.

"The main issue is whether or not people will have a family doctor," Dr Sheen said.

The Ballarat and District Division of General Practice said no other Ballarat GPs are thought to be attending the meeting.