In a written statement to the House of Commons last week, Ms Keen said the NHS Next Stage Review was core business for the NHS and involved no additional cost to the taxpayer.
But, she added: 'The total departmental spend so far on staff, patients and public engagement in direct connection with the review is £1.2 million.'
The Darzi review proposed that more than half of GP practices open extended hours. It is also likely further to threaten the future of the MPIG.
A 10-strong advisory board will take on the work of the Darzi report, published earlier this month. The final review will be published in June 2008.