The Waitangi Tribunal is to launch an inquiry into health services and health outcomes for Māori.
It said it is working on the scope of the inquiry but 140 claimant groups have already sought to participate in it.
In general, Māori are over represented in poor health outcomes in New Zealand.
The tribunal said the Crown has been told to file any Māori health documentation held by the Ministry of Health.
Over the next three months, work will be done to refine the scope, process and eligibility criteria for claims to be heard.
The inquiry will not consider any health-related grievances that have already been heard by the Tribunal or that have already been settled by the Crown.