Labor has continued to call for Federal Health Minister Sussan Ley's resignation amid unanswered questions about more than a dozen taxpayer-funded flights to the Gold Coast, including trips around New Year's Eve in 2013 and 2014.

Key points: Over three years Sussan Ley travelled to the Gold Coast 20 times

Over three years Sussan Ley travelled to the Gold Coast 20 times Questions were put to Ms Ley's office about trips totalling $53,877

Questions were put to Ms Ley's office about trips totalling $53,877 Ms Ley says apartment purchase was not the original intention of a 2015 trip

Ms Ley charged taxpayers $655 for her flight to the tourist strip at the end of 2013, and a year later, after another Gold Coast New Year's Eve, she charged for her and her partner's flights back to Sydney.

ABC News has analysed three years' worth of the minister's travel reports and found she travelled to the Gold Coast — where she and her partner own two properties — 20 times.

Questions were put to Ms Ley's office about 18 trips, worth $53,877.

The most expensive flight was a $12,365 charter flight taken in March 2015.

The minister purchased an almost-$800,000 apartment on another $3,125 taxpayer-funded trip later that year.

Ms Ley has agreed to partly pay back the cost of four trips, as well as two other accommodation claims on the Gold Coast and a flight.

During one trip to the Gold Coast in 2015, Ms Ley purchased an apartment in this building. ( AAP: Scott Bailey )

She declined an interview, but issued a statement apologising for the "error of judgement" and said it did "not meet the high standards" set by the Prime Minister.

"While attending an auction was not the reason for my visit to Queensland or the Gold Coast, I completely understand this changed the context of the travel undertaken," she said.

"The distinction between public and private business should be as clear as possible when dealing with taxpayers' money."

She said she had asked the Department of Finance to review all of her ministerial travel to the Gold Coast.

Her office said in the statement: "In her portfolio, she is required to undertake extensive meetings with doctors, patients and other organisations that are not media or public events."

Education Minister Simon Birmingham has defended his colleague, saying that "extensive travel is of course a clear part of her responsibilities".

Senator Birmingham told the ABC he did not believe that Ms Ley had breached the Ministerial Code of Conduct.

"I appreciate nobody, nobody likes to have discussions about politicians' entitlements, pay, travel," he said.

"All of us have a very serious responsibility to make sure that what we do is within the rules.

"Of course we are working with the Government to implement a comprehensive review of the rules that was undertaken last year to make sure that they actually have far better arrangements in place in the future."

But Ms Ley's Opposition counterpart Catherine King has continued to question the flights, saying it would be unusual to have official business over New Year's Eve.

"This minister seems to really like the Gold Coast. For official business, that does seem a very high number of trips," she said.

Ms King told the ABC that this was a test for Prime Minister Malcolm Turnbull, who she called on to enforce ministerial standards.

"Frankly, I don't think she's got any choice in that circumstance but to resign," she said.

"She hasn't provided an explanation of how this came about... If she's not willing to resign, I don't think Malcolm Turnbull has any choice but to step her down from the frontbench."

How much did your local MP spend?

Explore how much your local politician spent from January 1 to July 30 in 2015 with our interactive chart, ordered from the politician with the most expenses claimed to the least.

Some past politicians will also appear, having lodged prior expenses with the Department of Finance during the six-month period.