If someone is in need of help for alcohol and drug addiction and is lucky enough to be covered under health insurance, most drug and alcohol treatment facilities in Brentwood, CA. accept health insurance and will cooperate with clients to find out which rehab services are insured. The majority of private health insurance entities will cover outpatient and inpatient alcohol and drug treatment, but the time which is included can vary. Private health insurance will typically cover the first 4 weeks of drug rehabilitation, although there are individuals whose coverage is more extensive and could also extend to a longer residence in a drug and alcohol rehabilitation facility. It is recommended that individuals seek advice of their insurance company directly in liaison with the rehab facility to determine what is approved by your private health insurance.