Most plans do cover rehab, and here is why. Federal parity law requires insurers to treat addiction and mental health care the same way they treat any other medical condition, so coverage for treatment is the baseline, not the exception. What varies is the detail. We help you sort out which levels of care your plan includes (detox, residential, outpatient) and what your share of the cost will look like. Those are the real questions, and we walk through them with you before you commit to anything.