Billy Joel is "not dying", amid his rare brain condition diagnosis.

Radio DJ Howard Stern has told how he recently had dinner with the 76-year-old music icon, who has been diagnosed with Normal Pressure Hydrocephalus (NPH), a rare condition caused by a build-up of fluid in the brain, and Billy urged Howard to tell people he won't be meeting his maker anytime soon.

Speaking on 'The Howard Stern Show' on Sirius XM, Howard said: "He does have issues, but he said, 'Yeah, you can tell people, I'm not dying.'

"He wants people to know that. He's got to deal with some medical stuff, but he was delightful."

Howard and Billy had dinner to celebrate the 'Piano Man' hitmaker turning 76 last month, and the broadcaster admitted they had a "great conversation".

However, Howard joked Billy "threw up" after he played 'Happy Birthday' to the legend.

The 71-year-old star said: "He didn't seem real impressed."

Last month, Billy cancelled his upcoming tour because of the brain disorder, which has caused problems with his hearing, vision and balance.

A statement posted on his Instagram said: "Billy Joel has announced that he will be cancelling all scheduled concerts following a recent diagnosis of Normal Pressure Hydrocephalus (NPH). This condition has been exacerbated by recent concert performances, leading to problems with hearing, vision and balance.

"Under his doctor's instructions, Billy is undergoing physical therapy and has been advised to refrain from performing during this recovery period. Billy is thankful for the excellent care he is receiving and is fully committed to prioritising his health. He is grateful for the support from fans during this time and looks forward to the day when he can once again take the stage."

Billy added his own message to fans, saying: "I'm sincerely sorry to disappoint our audience, and thank you for understanding."

The star's cancelled tour includes 17 dates in North America and England.

Last week, it was reported he has no plans to retire following his diagnosis.