Documents show people in the electorate of Whanau Ora Minister Tariana Turia are receiving the most money from a Whanau Ora fund.
Between 2010 and 2012, $12.6 million was paid out under the Whanau Integration, Innovation and Engagement Fund.
Families can apply to the fund for up to $20,000 for help in achieving goals such as a healthier lifestyle or giving up gambling.
A review by an outside consultancy and released under the Official Information Act says the distribution of money is quite uneven.
It notes nearly a quarter of all individuals who received funding applied for money in the Te Tai Hauauru region, which is represented in Parliament by Tariana Turia and has 8% of the Maori population.
By comparison, the Tamaki Makaurau region, home to a quarter of all Maori, has the lowest number of individuals getting funding.
The report says there is no single reason to explain the regional difference and suggests it could be down to the strength of the regional offices.