Instagram/Billy Joel & Alexa Ray Jo Celebrity Billy Joel's daughter shares an update on his NPH recovery. Learn about his progress, physical therapy, and resilient spirit after tour cancellation. March 16, 2026 AceShowbiz - Billy Joel was diagnosed with Normal Pressure Hydrocephalus (NPH), a neurological disorder, in May last year. Nearly a year after this diagnosis, his daughter, singer Alexa Ray Joel, has provided an update on her father's recovery and current health status. Alexa Ray Joel told The Hollywood Reporter that her dad is making significant progress.