Most Narragansett Pier drug addiction treatment centers deal with mental health and co-occurring disorders (dual diagnosis treatment) in addition to their drug rehabilitation and alcohol rehabilitation services. When addiction and mental health related disorders exist together they are known as dual diagnosis. Dual diagnosis is an increasingly popular focus among rehab centers and programs in Narragansett Pier. Today, dual diagnosis treatment is a service offered in most drug rehabilitation centers and alcohol rehab programs. However, there are addiction treatment centers that specialize in dual diagnosis treatment and provide drug rehab and alcohol rehab services as an integrated part of their dual diagnosis rehabilitation programs.