Paramedics were called at about 3 a.m. PST Thursday, said Capt. Scott Brown of the Orange County Fire Authority. Details about the accident weren't disclosed.
Fortensky, 46, was admitted and was listed in critical condition, the Mission Hospital Regional Medical Center said late Thursday.
Taylor was notified that Fortensky was seriously hurt. She was "deeply shocked and her prayers are with Larry Fortensky," her publicist Shirine Ann Coburn said.
Taylor, the Oscar-winning actress, met Fortensky when both were at the Betty Ford Clinic to kick substance abuse problems. They were married in 1991, but five years later Taylor filed for divorce, citing irreconcilable differences.