A Government-appointed Treaty of Waitangi claims negotiator was paid more than $2.2 million over seven years, figures released to NZ First leader Winston Peters show.
Mr Peters sought details of the payments from Treaty Negotiations Minister Chris Finlayson.
They cover 12 negotiators and show the annual payments made to them between 2008 and this year.
The highest earner was Michael Dreaver, who was paid $2,264,102 over seven years.
Ross Philipson was paid $1,550,389, also over seven years.
Others, including former MPs Rick Barker, Paul Swain, Fran Wilde, Paul East and Sir Douglas Graham, were paid lesser amounts.
Sir Douglas was paid $166,135 over two years and Mr Swain $611,084 over seven years.
Mr Peters says the information given to him is inadequate.
He wants to know why Mr Dreaver was paid more than $2 million over seven years, and in three of those years over $400,000 in each year.
"The public will want to know just what sort of complexity justifies these extraordinary costs," Mr Peters said.
"It is clear that a number of negotiators were reasonable in their charges, and no one is challenging that."