A plan to ask NSW GPs to work out of hospitals, enabling patients to dodge the federal government's proposed co-payment scheme, has been labelled "extraordinary" by opposition treasury spokesman Chris Bowen.

NSW Health Minister Jillian Skinner raised the idea during an interview on the ABC's 7.30 program on Friday.

Jillian Skinner. Credit:Chris Lane

"I'm going to be looking at options which invite a GP, for example, into the hospital to treat that patient," Ms Skinner told the ABC.

"Now they're funded through Medicare by the commonwealth. So that's a cost shift to the commonwealth and that's exactly who should be paying for it. That's their obligation."