Warning: This story deals with suicide and may be upsetting.

The family of Nicky Stevens, who took his own life while in mental health care, will take their battle for an apology and compensation to Prime Minister Jacinda Ardern.

Dave Macpherson and Jane Stevens, together with their other son, Tony Stevens, will meet with the Prime Minister on Wednesday to discuss the case.

Nicholas Taiaroa Macpherson Stevens died after he left the Henry Rongomau Bennett Centre at Waikato Hospital on unescorted leave, against the express direction of his parents.

The mother of Nicky Stevens has told members of a health board about the impact of its request to reopen a coroner's inquest into the death of her son.

The 21-year-old musician, who suffered from schizophrenia, disappeared on March