Health Minister Sussan Ley is under pressure after departmental documents revealed she charged taxpayers more than $10,000 per day during a trip to the United States last February.

Ms Ley tweeted photos during the trip which cost more than $40,000 in flights, $21,000 in ground transport and $11,000 in accommodation and meals - $76,133 in total over seven days.

In comparison, cabinet colleague Darren Chester, who stood alongside world leaders in Belgium for the last post ceremony at the Menin Gate charged a total of $10,700 for the entire six-day trip.

The report comes after it was revealed Ms Ley purchased a $795,000 apartment from a Liberal National Party donor on a taxpayer-funded trip to the Gold Coast last year.

The minister did not respond today, although her office says among the meetings during the US trip were talks with pharmaceutical companies that could see new medicines introduced here in Australia. They insist all travel adhered to parliamentary guidelines.