The 35-year-old basketball player is recovering after collapsing at a brothel in Nevada last week following a drink and drugs binge.
Kardashian, who is making his medical decisions, has decided to move him to LA where she can support him, reported Us magazine.
"Khloe and her mother Kris (Jenner) decided to move Lamar to a rehab center in LA so they can all be closer to him. He's still getting better little by little. The doctors are starting to talk about plans for what happens when he gets out and that's how rehab came up, but he still has a ways to go," a source said.