In this case, a treatment center (some instances also referred to as a rehab facility) would refer to a licensed addiction treatment facility, which specializes in the treatment of drug addiction, alcoholism and associated disorders. Some are licensed to treat substance abuse and chemical dependency along with co-occurring disorders. The services a facility offers vary depending on the specific rehab, and could include all or some of the following levels of substance abuse treatment: residential treatment, partial hospitalization treatment, intensive outpatient treatment services, detoxification, individual counseling or therapy.