United Kingdom, June 4 -- 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 adm...