California-Specific Group Health Insurance Requirements
California has some of the most comprehensive group health insurance requirements in the nation — going significantly beyond federal ACA minimums in several areas. California employers offering group health must understand both federal (ACA) and state (California Insurance Code, Knox-Keene Health Care Service Plan Act) requirements. Working with a California-licensed broker ensures you're getting plans that meet all applicable requirements.
Minimum group size in California: as few as 1 eligible W-2 employee (not counting the owner). California's small group market (1–100 employees) is community-rated — carriers cannot vary premiums based on employees' health status, claims history, or gender. Rating factors allowed: employee age (3:1 maximum ratio between oldest and youngest rates), zip code, and plan design (actuarial value).
Knox-Keene Health Care Service Plan Act
California HMOs are licensed under the Knox-Keene Act, administered by the California Department of Managed Health Care (DMHC). This law mandates: network adequacy standards (maximum geographic distance and travel time to providers), continuity of care (30-day minimum continuation when a provider leaves the network), emergency services coverage at in-network rates regardless of whether the ER is in-network, and an independent medical review (IMR) process for disputed claims. Knox-Keene protections apply to HMO and HMO-like EPO products; PPO products are regulated by the California Department of Insurance (CDI).
California Mental Health Parity
California's mental health parity law (MHPAEA) requires that mental health and substance use disorder (MH/SUD) benefits be covered at parity with medical/surgical benefits — no higher copays, deductibles, or day/visit limits for mental health than for comparable medical conditions. California's parity requirements are stricter than federal MHPAEA in several respects. Fully insured California group plans must comply with DMHC or CDI mental health parity requirements. Self-funded plans comply with federal MHPAEA.
California-Mandated Benefits
California mandates coverage for: dependent coverage to age 26 (same as federal), breast reconstruction after mastectomy (state and federal), infertility diagnosis and treatment (required for large group plans — 100+ employees), clinical trials coverage, pediatric dental and vision (ACA essential health benefit in small group market), and chiropractic and acupuncture care (in many plan types). California also prohibits annual and lifetime dollar limits on essential health benefits (ACA requirement). Some mandates apply only to fully insured plans, not self-funded ERISA plans.