I believe by rehab they mean rehabilitation center. Not drug rehab.
He will need some rehabilitation before he can go to drug rehab.
However since he was transported by MEDICAL helicopter, I believe he went to another medical facility.
(Now the real question is, did they have like a specially long medical copter this time?!)
http://www.people.com/article/lamar-odom-transferred-to-la-from-vegas
A source tells PEOPLE that Odom was transferred to the ICU at Cedars-Sinai, L.A., on Monday night. The former NBA star is said to have been airlifted via a medical helicopter.
"Khloé and several nurses are with him. Lamar still can't walk but has left the hospital in a bed," the source reveals.