My 23 Year Old Son Has Been Under A Doctors

My 23 year old son has been under a doctors supervision for prescription pain pill abuse, he has him on suboxone therapy taking (3) 8mg/2mg film strips per day for about a year now. My sons required to submit to weekly drug text which he failed to take in the last 3 weeks. Doctor feels as do I he needs to go to rehab. I want to get him in rehab what's the best type of rehabilitation I should look for?.