A few more details from Randy West on his Facebook page a few minutes ago:
Bob Barker update...
Less than two months from his 95th birthday, Bob was taken to Cedars Sinai Hospital at approximately 1:00pm today. At present he is reported to be alert and resting more comfortably than he felt earlier.
Bob was hospitalized last week for a serious back injury. According to his spokesman William Prappas, Bob woke up this morning with a major flare-up in back pain from the previous injury, which prompted a call to paramedics.
The Los Angeles Fire Department arrived at Barker's Hollywood Hills home and carried him out on a stretcher for transport to Cedars. Prappas explained the only reason an ambulance was called was because it would have been hard for Bob to get into a car with the injury, and assistance was needed.