Rose Lightfoot, chief executive of Te Tai Tokerau PHO, said it was "really important" that Northlanders would not have to wait until next year for the policy to take effect.
"The people in need in the Northland community actually have it now, and that will result in improved health and well-being for our children," Ms Lightfoot said.
Around 62,000 people were enrolled in Te Tai Tokerau PHO, which covers the area from Kawakawa north, 47 per cent of whom were classified as living in the highest level of deprivation.
The policy was not officially announced until Tuesday, as the three organisations wanted to make sure there were no teething problems.
"It's all very well to go to a doctor, but then you have to go and pay for the scripts as well," Ms Lightfoot added, which was why it was important that the $5 fee for prescription medicines was also covered.
But while cost could be a serious barrier to healthcare, it was also important to address other barriers such as transport and making doctors' offices welcoming and accessible to everyone.
The community response that she was aware of was very positive, however.
"People have been really pleased about it," she said, adding that it was hoped that the new regime would reduce hospital admission rates as parents found it easier to seek treatment for their children before their health problems reached a serious stage.