California has expanded its oversight of certain health care mergers, acquisitions, and financial arrangements as new regulations from the Office of Health Care Affordability (OHCA) take effect on November 2, 2026.
The regulations implement provisions of AB 1415, which expanded California’s health care transaction oversight framework beginning January 1, 2026. Approved by the Office of Administrative Law on October 2, the new regulations clarify reporting requirements for transactions involving private equity groups, hedge funds, management services organizations (MSOs), and other qualifying entities.
Under the expanded framework, certain transactions involving ownership interests, management arrangements, and health care real estate may require advance notification to OHCA. Whether a transaction must be reported depends on applicable ownership thresholds, control rights, transaction characteristics, and regulatory exemptions.
Covered transactions are generally subject to a 90-day advance notification requirement before closing. OHCA may then determine whether a more detailed Cost and Market Impact Review (CMIR) is warranted.
Why This Matters
California’s expanded oversight is intended to provide greater transparency into changes in health care ownership and financial arrangements that could affect competition, affordability, and access to care.
For hospitals, physician organizations, health care investors, and management services organizations, the regulations establish more detailed filing and disclosure requirements that may need to be considered when planning transactions.
Importantly, the regulations do not automatically prohibit mergers or acquisitions. Instead, they expand the state’s ability to examine qualifying transactions and assess their potential effects on California’s health care market.
The changes represent another component of California’s broader health care affordability strategy, complementing OHCA’s separate work on statewide health care spending targets and cost accountability.
