California SB 855 and What It Means for Your Rehab Coverage
California's Senate Bill 855 (Wiener 2020) took effect January 1, 2021 and was strengthened by enforcement regulations finalized by Insurance Commissioner Ricardo Lara in July 2025. It requires commercial insurers to cover medically necessary treatment for all mental health and substance use disorders at parity with medical and surgical benefits.
What SB 855 actually says
SB 855 expanded California's Mental Health Parity Act to require coverage of all mental health conditions and substance use disorders listed in the current International Classification of Diseases (ICD) or Diagnostic and Statistical Manual (DSM). Previously, California law required parity only for a specified list of 'severe' mental illnesses — a 1999 framework that had become clinically obsolete. SB 855 eliminated that narrow list and extended parity to the full diagnostic range.
The specific protections
SB 855 prohibits commercial insurers from: limiting mental health or substance use disorder benefits to short-term or acute treatment; rescinding prior authorization for services after they've been rendered; using 'discretionary clauses' that give insurers unilateral authority to interpret coverage terms; applying more restrictive utilization review criteria to mental health or SUD care than to medical or surgical care. It also requires insurers to arrange out-of-network care at in-network cost-sharing levels when no in-network provider is available within reasonable geographic or timely access standards.
Medical necessity standards
Under SB 855, medical necessity for substance use disorder treatment must be determined using 'generally accepted standards of care' — specifically, the criteria developed by nonprofit professional associations for the relevant clinical specialty. For addiction, this means the ASAM (American Society of Addiction Medicine) criteria. Insurers must use ASAM-grade decision-making. Reviewers conducting utilization review for substance use determinations must be board-certified addiction specialists, not generalist medical reviewers.
What the 2025 enforcement regulations added
In July 2025, Insurance Commissioner Ricardo Lara finalized regulations implementing SB 855 and integrating it with AB 988 (the 988 crisis line law). The regulations established: a formal complaint process for patients alleging parity violations, specific qualifications for claim reviewers, explicit out-of-network coverage triggers when in-network access is inadequate, and administrative accountability for insurers not complying with the law.
What to do if you believe your insurer is violating SB 855
The California Department of Insurance operates a consumer complaint hotline: 1-800-927-4357. Consumers can file complaints online at insurance.ca.gov. Common parity violations include: denials of medically necessary residential treatment on duration grounds alone, rescission of prior authorization, and arbitrary step-therapy requirements that don't apply to comparable medical benefits. The Department investigates complaints and can impose penalties.
How this interacts with inpatient rehab placement
For callers with commercial insurance, SB 855 means that a medically necessary inpatient stay must be covered at parity — no arbitrary day caps, no harder utilization review than for medical care, and out-of-network placement when in-network programs aren't available on a reasonable timeframe. Placement advisors factor SB 855 into every verification call and help callers understand the protections they're entitled to.
FAQ
Common questions
Does SB 855 apply to Kaiser or HMO plans?
SB 855 applies to commercial health care service plans regulated by the Department of Managed Health Care (which covers HMOs including Kaiser) as well as disability insurance policies regulated by the Department of Insurance. Both regulators enforce the parity requirements.
Which types of insurance does SB 855 cover?
SB 855 applies to commercial health plans and insurance policies regulated by California — including employer-sponsored PPOs, HMOs, and individual-market plans. Our placement advisors verify coverage against PPO and commercial HMO benefits when you call.
What if my employer is self-funded?
Self-funded employer plans are regulated primarily under ERISA at the federal level. Federal parity (MHPAEA) applies, which has similar but not identical protections. Placement advisors can note this distinction during verification.