The outcome received a withering response from Colin Milne, who wrote a letter of complaint to the commissioner on behalf of his deceased son and the Milne family.
"We've had a letter back saying their legal team are going to review the whole thing, so we'll see," he told the Bay of Plenty Times Weekend.
Colin and Marianne Milne and their son Lance with a picture of son/brother Brad Milne and his son Cole
Within his letter, Mr Milne challenged the level of care Brad had received and wrote "we do not accept that the care given was "appropriate" and for you to suggest otherwise is a gross misrepresentation of the facts. If it was appropriate then our son would not be dead!"
The issue of support was one seemingly backed by Bay of Plenty regional coroner Wallace Bain, in his submission to the HDC's investigation.
The report said Dr Bain had outlined his concerns that Brad may have been left without appropriate medication in the week prior to his death. He further queried whether there were appropriate services available to Brad.
Mr Milne also wrote of his disgust at the lack of family involvement in the report's compilation.
"We are amazed and angry that in reviewing our complaint you have not sought the input of Brad's family and friends" and had instead "relied solely on the statements of the medical practitioners involved in Brad's treatment".
Mr Milne said only by speaking to those closest to him could a true assessment of Brad's health be made.
He wrote "this glaring anomaly is consistent with Brad's care for 12 years" and "that you have not sought to interview Brad's partner Sarah is a shocking indictment on the professionalism of this report".
Mr Milne went on to criticise what he called "professionally weak and ineffectual" language used in a report which "fails to ask the questions that still remain unanswered".
He said, rather than using the report to avoid blame, one of the biggest disappointments for him was the failure of anything constructive to emerge.
"We were hoping they were going to say they could've done things better, lessons they had learned from Brad's death, or what could be done to prevent a similar tragedy happening in the future, but there was none of that, it was just a whitewash."
The Bay of Plenty Times Weekend is at present unable to reveal the details of Brad Milne's death for legal reasons.
When contacted, the office of the Health and Disability Commissioner, said it did not comment on individual cases other than to confirm if a complaint had been lodged.
Referring to the Milnes' case, the commissioner's executive assistant, Kerry Norman, said: "I can confirm that the Health and Disability Commissioner's office has this complaint."
The inquest into Brad Milne's death is yet to be held.
A memorial concert will be staged by Mr Milne's family between the family-run restaurants Crown & Badger and Steakout, in Wharf Street, on July 29.
"You can't bring Brad back but if you can help someone else, so another family doesn't have to go through what we've been through, that's what we're looking for," said Mr Milne.
The Brad Milne Memorial Concert will feature local musicians including Ian Taylor & Keel, Chris Gunn, Andy Craw and One One One.