Koinonia Foster Homes Koinonia Treatment Clinic is an outpatient drug rehab located in Loomis that offers substance abuse treatment and other drug rehab services. Koinonia Foster Homes Koinonia Treatment Clinic in Oakland has a special program for teens struggling with addiction, in addition to general drug and alcohol rehab. Koinonia Foster Homes Koinonia Treatment Clinic accepts self payment and Medicaid as payment for drug and alcohol rehab services.