Does Insurance Cover Rehab in California?
California's SB 855, effective January 1, 2021, requires commercial insurers to cover medically necessary treatment for all mental health and substance use disorders under the same terms as other medical conditions. New enforcement regulations enacted in July 2025 further strengthen these protections.
Source: CA Insurance Code §10144.5; CA Dept. of Insurance, July 2025What Does California Law Require Insurers to Cover?
Senate Bill 855 requires commercial health plans to cover medically necessary treatment for all substance use disorders. The key word is 'all' — not just certain substances, and not just certain levels of care. This includes medical detox, residential inpatient treatment, partial hospitalization (PHP), intensive outpatient (IOP), and medication-assisted treatment (MAT).
The law requires equal treatment compared to other medical conditions. If your insurance covers hospitalization for a cardiac condition without burdensome prior authorization, it cannot apply more stringent requirements to inpatient addiction treatment.
Does My PPO Cover Residential Treatment?
For most PPO plans, yes — though coverage specifics vary. Two California court decisions (Harlick v. Blue Shield, 9th Cir. 2011; Rea v. Blue Shield, 2014) established that California's parity law requires coverage of medically necessary residential treatment.
The most reliable way to know what your plan covers is to call (213) 436-1435 and let a placement advisor verify your benefits directly with your insurer. This is free and takes about 30 minutes.
What Are Common Insurance Denials — and How to Fight Them?
The most common denial reasons include: 'not medically necessary,' 'lower level of care is appropriate,' 'concurrent review not approved,' and 'out-of-network benefit maximum reached.'
All of these can be appealed. Under SB 855, denials based on criteria more restrictive than those applied to other medical conditions may constitute a parity violation. If your insurer denies coverage, you have the right to:
- Request a written explanation of the denial
- File an internal appeal with your insurer
- Request an Independent Medical Review (IMR) through the CA Dept. of Managed Health Care
- File a complaint with the CA Dept. of Insurance
How Much Is Rehab in California Without Insurance?
The average cost of residential rehab in California is $56,654 for a 30+ day stay, according to the National Center for Drug Abuse Statistics. In Los Angeles specifically, 30-day inpatient programs range from $20,000 to $75,000 without insurance, with luxury programs exceeding $100,000 per month (ClearCost Recovery, 2025).
With PPO insurance coverage, patients typically pay a fraction of these costs — deductible plus co-insurance, which varies by plan. Placement advisors will give you a clear cost estimate before you commit to anything.
How Do I Verify My Coverage?
Call (213) 436-1435. A placement advisor will verify your benefits with your insurer, give you a clear picture of what's covered, and walk you through your options. The call is free, confidential, and carries no obligation. Most verifications are completed within 30 minutes.
Frequently Asked Questions
What is a Benefit Verification, and is it free?
A benefit verification is when a placement advisor calls your insurance company on your behalf to determine exactly what your plan covers for addiction treatment — including deductibles, co-insurance rates, in/out-of-network status, and prior authorization requirements. Yes, it is free at Cornerstone of Wellness.
Can my insurance company be forced to pay for rehab if they deny?
Under California law and federal parity law, insurers who deny medically necessary addiction treatment based on criteria more stringent than those applied to other medical conditions may be subject to enforcement action. The California Dept. of Managed Health Care (dmhc.ca.gov) handles complaints against HMO-type plans; the CA Dept. of Insurance (insurance.ca.gov) handles PPO complaints.