Jami-Lee Ross attends opening of building at Middlemore Hospital mental health unit

Ex-National MP Jami-Lee Ross has made his first public appearance since receiving treatment for mental health issues.

The independent MP, who was kicked out of the National Party in spectacular fashion in October, attended the opening of a new building at Middlemore Hospital's Tiaho Mai mental health unit, where he was treated.

He was not expected to speak, telling Stuff earlier he would "just be there quietly applauding the exceptional people that work in mental health, and thank them for what they do supporting patients during some very difficult times".

"I hope to see some of the doctors and nurses that were so kind to me while I was in their care."

Mr Ross was welcomed onto the hospital grounds in a powhiri as part of a large group. So far, he has been seen talking to other guests.

Jami-Lee Ross at Middlemore Hospital. Photo credit: Newshub.

Health Minister David Clark Mr Ross in his opening remarks paid "respect and honour" to Mr Ross.

"It is really good to have you here today Jami. Welcome. I just want to acknowledge and pay my respects to you for being a part of today."

Though at first promising to vacate the Botany seat and re-contest it in a by-election, he has since said he'll stay in Parliament.

While he's on leave, New Zealand First will be placing his vote for him along National Party lines. Mr Ross offered his vote to his former party, which declined.

Mr Ross was taken to hospital by police at the end of a tumultuous week in which he accused National leader Simon Bridges of breaking the law, before numerous bullying accusations were levelled against him.