He said health inequities were due to cultural (on average Maori live eight years less than Pakeha) and deprivation issues.
"It is slightly more subtle than Maori versus Pakeha," he said.
"We need to pick up whole practices. This isn't about the relationship between the HBDHB and the individual, it is about the relationship between the practice and the enrolled population."
He said families may choose switch to different health practices in order to take advantage of the free health care.
It was a "pretty big" pilot programme and if successful would be rolled out to the whole region for the age group.
"It is about early intervention, building a relationship with a general practice and seeing it as the first place you expect to have a relationship with about your health [rather than] waiting until you are desperately ill and turning up at ED because it is free."
The downstream benefit would be both better health and cost savings.
Labour's Tukituki candidate Anna Lorck applauded the proposal.
"Cost and access to a doctor are once again showing the widening inequality gap that is becoming a huge social, health and economic challenge for our youth in our region," she said.
"This $500,000 investment to provide zero fees for 13- to 17-year-olds living in our most impoverished areas across Hawke's Bay, based on an average two visits a year, could well break down a real barrier to encouraging younger people to take better care of their health.
Mr Evans said he knew of no other DHB that had "pushed along this path".
"What's important to me is what is good for Hawke's Bay."