Yes. For most plans, addiction and mental health treatment is covered, because federal parity law requires insurers to treat these conditions like any other medical care. That means your plan cannot slap harsher limits on rehab than it would on, say, surgery or diabetes care. The real questions are narrower. Which levels of care does your plan cover (detox, inpatient, partial hospitalization, outpatient), and what will you actually pay out of pocket? Those answers depend on your specific policy, your deductible, and whether the provider is in network.