"I am satisfied there are issues surrounding the death that meant the duty coroner should have been notified promptly," he said.
Northland DHB CEO Nick Chamberlain said he has had the opportunity to review its position on the matter.
"We had no knowledge that the patient's cause of death could have been contributed to by the 'Ice Challenge' game he had apparently participated in," Dr Chamberlain said.
"We were unaware that the patient had participated in the 'Ice Challenge' which, had we known, would have triggered notification immediately to the coroners' office. There are absolutely no issues with our clinical care.
"This matter is now in the hands of the coroner and Northland DHB will co-operate fully with the coroners' office."
The ice challenge has become a viral phenomenon in New Zealand and around the world. It involves a participant submerging themselves in ice cold water or having a bucket of ice water poured over them. They then nominate others to take the challenge and make a donation to charity.
But in countless online videos, the exercise is conducted hand-in-hand with the consumption of a lot of alcohol.