ACA health insurance plans may cover the costs of rehab in California.  The ACA (Affordable Care Act) was passed in 2010. By 2014, all new individual and group health insurance plans were mandated to provide coverage for essential health benefits, including both substance use disorder services and mental health disorder substances.  In the first instance, you should contact your healthcare provider concerning the specifics of your policy. Next, assemble a shortlist of suitable treatment providers who will accept insurance as payment, such as California Detox.