The amount of money being spent on health care for Auckland is dropping as the population grows and the problem is getting worse.
Auckland District Health Board chief executive Ailsa Claire made the revelation in a blog post telling staff they needed to "challenge the way we've 'always done things'."
"We continue to face a challenge as the gap between our funding and projected population widens. It means we have to do things differently, we have to be brave, get quicker at decision making and give each other permission to try some things out."
Health board member Doug Armstrong confirmed the problem, saying "ADHB is progressively falling behind".
He said the widening gap was believed to be a consequence of Auckland's rapidly growing population causing issues with the population-based funding formula used by the Government to work out how much money each health board should get.