Category: Global regulation · Reviewed by Jake Leat, Associate Director · Last reviewed 2026-06-05
The California Department of Insurance (CDI) is the insurance regulator of the State of California, headed by an Insurance Commissioner elected by the people of the State for a four-year term. It is the largest US state insurance regulator by gross premium volume and is notable for its mandatory prior-approval rate regulation under Proposition 103 of 1988.
Category: Global insurance regulation Also known as: CDI, California DOI Jurisdiction: State of California Founding statute: California Insurance Code (originally consolidated 1872; substantially amended by Proposition 103, 1988) Related concepts: US state-based insurance regulation, NAIC
CDI regulates licensing, prudential standards, market conduct, and rates for insurers transacting insurance business in California. It is headquartered in Sacramento with offices in Los Angeles and San Francisco. The Department is unique in the United States in that its Commissioner is directly elected, providing democratic accountability but also producing distinctly politicised rate-regulation outcomes.
The principal statute is the California Insurance Code, especially Chapters 9 and 10 added by Proposition 103 in 1988, which requires prior approval of rates for property and casualty insurance (with limited exceptions). Proposition 103 also opened intervenor participation in rate proceedings, with statutory provision for intervenor fee awards. The Insurance Code is supplemented by Title 10 of the California Code of Regulations (CCR), promulgated by the Commissioner.
The prior-approval rate regulation regime requires insurers to file proposed rates, justify them with actuarial analysis, and obtain CDI approval before implementation. Intervenors — typically consumer advocacy organisations — may participate in rate proceedings and challenge proposed increases. The process can be lengthy and adversarial, particularly in classes such as homeowners’ insurance where wildfire and earthquake exposure has produced significant pricing pressure. The California FAIR Plan provides residual-market access for property risks unable to obtain admitted-market cover.
CDI also licenses insurance agents, brokers, and surplus lines brokers; conducts financial examinations of California-domiciled insurers; oversees workers’ compensation insurance pricing; and operates the California Insurance Guarantee Association for insolvent insurers.
The UK has no direct equivalent of mandatory prior-approval rate regulation; FCA Consumer Duty and ICOBS impose fair-value and product-governance requirements rather than rate approval. The California regime is closer in spirit to the historical Building Societies Commission price controls than to contemporary UK conduct supervision.
This entry is part of the Apex Insurance Wiki. Last reviewed by Matt Bartlett on 2026-06-05. Next review: 2026-12-05.
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