California's Office of Health Care Affordability has put its expanded health care transaction review rules into final form, and the version now heading to state administrative approval is meaningfully different from the draft investors read in May. The ownership threshold that triggers a filing moved from 5 percent to 10 percent. The governance-rights trigger stayed. The rules for management services organizations were rebuilt around a statutory definition. And real estate sale-leasebacks now stand alone as their own filing event. The regulations implement AB 1415, California's attempt to watch private equity, hedge funds, and management services organizations before they complete health care deals rather than after.
The 10 percent threshold is the change with the widest effect. Under the May draft, acquiring 5 percent of a health care entity's assets, equity, debt, or liabilities triggered a notice obligation. The September version aligns the trigger with the federal Hart-Scott-Rodino passive investment exemption, at 10 percent, and applies whether the stake is held by a single fund or assembled collectively. The shift pulls ordinary minority positions out of the reporting regime, and it was the most criticized feature of the earlier draft. The alignment is deliberate: California is trying to track federal antitrust thresholds rather than run a parallel and lower one.
The governance trigger that survives any threshold
The ownership percentage was never the whole story, and the final rules make that explicit. Regardless of the size of a stake, a filing is required if a private equity group or hedge fund acquires governance rights: appointing or replacing leadership, vetoing material decisions, managing or operating the entity, charging fees, or controlling capital or net income. That trigger catches the transaction structures that matter most in health care, where influence is often exercised through control provisions rather than majority ownership. An investor can be under 10 percent and still owe the state 90 days of notice if the deal documents give it a veto.
The 90-day requirement is the operational heart of the law. Parties must give the agency 90 days' prior written notice before closing, and a cost and market impact review can push the closing more than eight months out. The dollar thresholds sit at $25 million in primary revenue or California assets, with a $10 million secondary threshold, and a ten-year lookback captures serial and related transactions. The regime is designed so that the deals it covers cannot be quietly completed while the agency reads the filing.
The MSO rules that got rebuilt from scratch
The management services organization provisions changed more than any other part of the draft. The detailed regulatory definition of an MSO was deleted and replaced with a cross-reference to the statutory definition, with the qualifying criteria moved into the filing-threshold provisions. A hospital-owned MSO now qualifies with one physician organization as a client, down from two in the May draft. And the May draft's express trigger for a 25 percent change in MSO ownership is gone, with the focus shifted to transfers of control, responsibility, or governance. The pattern across all three changes is the same: fewer bright-line numbers, more functional tests about who actually runs the entity.
The MSO question is where California's healthcare consolidation debate is most acute, because the MSO structure is the standard vehicle for private equity influence over physician practices. Investors do not own the medical practice, which state law often restricts to licensed physicians. They own the management company that holds the practice's revenue, leases, and decisions. The final rules try to capture that arrangement by what it does rather than what it is called, which is why the definitional rewrite matters more than the threshold changes.
The sale-leaseback trigger that stands alone
Real estate sale-leasebacks got their own filing trigger, and the final version is broader than the draft's critics expected. The trigger applies regardless of whether the provider is currently operating, providing services, or holding a pending or suspended license, which closes the obvious escape of structuring the transaction through a dormant entity. Sale-leasebacks have been the quiet channel of health care monetization for a decade: the practice sells its real estate to an investor and leases it back, converting a building into a financial obligation. California has now put that transaction on the same notice track as an acquisition.
The disclosure requirements extend through the whole ownership chain. Organizational charts must reach the ultimate parent. Private equity groups and hedge funds must identify the entities they own, control, or finance. MSOs must disclose every health care entity they serve. Compensation arrangements contingent on closing must be documented. The disclosures are the teeth of the regime: the agency's review depends on seeing the structure, and the rules are drafted to make the structure visible.
Where the rules sit in the approval process
The regulations are emergency rules, and that status shapes their timeline. The agency released the revised proposal on September 11, ran a five-day public comment period, and intended to submit the package to the Office of Administrative Law around September 18. OAL has ten days to review, and it can still make material changes. Emergency rules also expire on a fixed clock, which means the permanent rulemaking will follow, and the thresholds could move again. Law firms are already telling clients to redo their transaction analyses under the September version, because analyses done under the May draft no longer describe the regime.
The clearest measure of the rules' significance is the advice the deal bar is giving. Multiple firms have warned that prior analyses may no longer be sufficient and that pending transactions need to be re-evaluated against the new thresholds, the new MSO tests, and the new sale-leaseback trigger. When the people who structure health care deals are telling each other to stop and recompute, the regime has already changed behavior before its first review is complete. That is what California wanted: not to ban private equity from health care, but to make its entry visible, slow, and subject to state scrutiny.
Primary sources
- Simpson Thacher: California OHCA Issues Final Regulations Implementing Expanded Health Care Transaction Review Requirements
- Mondaq: OHCA Releases Revised Emergency Regulations Implementing AB 1415 Reporting Requirements
- Hooper Lundy & Bookman: California OHCA Updates Proposed AB 1415 Pre-Transaction Notice Regulations