On May 13, 2026, Vice President JD Vance and CMS Administrator Dr. Mehmet Oz announced the largest Medicaid payment deferral in history. The Trump administration is withholding $1.3 billion in federal Medicaid funds from California, citing fraud concerns in the state’s Medi-Cal program. The same announcement included a six-month nationwide moratorium on new Medicare enrollment for hospice and home health agencies, plus a fresh audit of every state’s Medicaid Fraud Control Unit.
This guide unpacks what actually happened, how a federal deferral works, why CMS singled out California, and what Medi-Cal providers, hospitals, and patients should do over the next 90 days. The story is moving fast, so the numbers and dates below reflect the May 13 announcement and the follow-up reporting on May 14, 2026.
What happened on May 13, 2026
Vance, who leads the administration’s federal healthcare fraud task force, used a White House news conference to announce three actions at once. First, CMS is deferring $1.3 billion in federal Medicaid matching funds owed to California. Second, CMS is placing a six-month moratorium on new Medicare enrollment for hospice providers and home health agencies nationwide. Third, every Medicaid Fraud Control Unit in the country is now under federal review.
Dr. Oz called the California deferral “the largest deferral we’ve ever made.” He told reporters CMS wants California to explain billing patterns that the agency describes as outliers, “numbers so big you can’t imagine anyone billing for these numbers of patients and that much for each patient.”
California Governor Gavin Newsom’s office pushed back, and Attorney General Rob Bonta said the state appears “to be targeted solely for political reasons.” The California Department of Health Care Services (DHCS), which runs Medi-Cal, has not yet released a detailed response to the specific outlier claims.
How a federal Medicaid payment deferral actually works
Medicaid is funded jointly by states and the federal government. Every dollar a state pays out under Medicaid triggers a federal match. In California’s case, the federal match covers a large share of total Medi-Cal spending each year.
A federal deferral is a temporary withholding of the federal share. The state still owes its providers under state law. But until CMS releases the funds, the state does not receive the federal portion it would normally claim. That gap puts pressure on state cash flow. The longer the deferral runs, the more pressure builds. CMS uses deferrals as leverage while it investigates the underlying spending patterns.
Deferrals are not the same as a full denial of federal funds. If CMS later determines that the state’s spending was proper, the federal money is released. If CMS finds improper spending, the state may have to pay back the federal share or absorb the cost permanently.
2026 CMS Medicaid Fraud Actions Timeline
From the Minnesota deferral to the largest deferral in history
Why CMS targeted California specifically
CMS officials pointed to three specific concerns when explaining the size of the California deferral. Each one is worth unpacking because each affects different parts of the Medi-Cal provider community.
The hospice concentration in Los Angeles
Dr. Oz said that about one-third of all U.S. hospice providers are based in a single city, Los Angeles. CMS treats that concentration as a fraud risk signal. Hospice has been a national fraud watch area for years, with the Office of Inspector General repeatedly flagging billing for patients who do not meet hospice eligibility criteria. The May 13 nationwide hospice enrollment moratorium ties directly to this concern.
Personal care and home services growth
CMS said California’s spending on personal care and home services is growing at roughly twice the national average. The state has expanded home and community-based services as a deliberate policy to reduce institutional care. CMS is questioning whether the growth reflects real demand or billing irregularities. Either way, providers in this category should expect more pre-payment review and documentation requests.
Expenditures tied to undocumented immigrants
CMS is also reviewing Medi-Cal spending tied to undocumented immigrants. California is one of the few states that expanded Medi-Cal access to low-income undocumented adults. DHCS estimates more than 700,000 undocumented immigrants were enrolled before the January 1, 2026 enrollment freeze for new undocumented adult applicants. Federal H.R. 1 legislation is also pushing California to move some immigrant groups from full-scope to restricted-scope coverage starting October 1, 2026.
The six-month hospice and home health enrollment moratorium
The moratorium is separate from the California deferral but landed on the same day. Starting May 13, 2026, CMS has paused new Medicare enrollment for hospice and home health agencies for six months. Existing hospice and home health providers can continue to bill Medicare and Medicaid. New entrants cannot get a Medicare provider number during the moratorium window.
CMS framed the pause as a way to “shut the door on fraud” while it identifies and removes bad actors already in the system. The moratorium applies nationwide, not just to California.
If you operate a hospice or home health agency in any state, the practical effect is straightforward. Any new applications already in the queue will sit. New corporate entities, mergers, or branch expansions that need new Medicare provider numbers are paused. Plan accordingly.
CMS Focus Areas in the California Investigation
The three categories driving the $1.3 billion deferral
CMS is now auditing every state’s Medicaid Fraud Control Unit
Vance also said CMS sent letters on May 13 to every state’s Medicaid Fraud Control Unit (MFCU), asking each to prove it is “effectively and aggressively” combating Medicaid fraud. The federal government funds MFCUs in all 50 states. Vance warned that federal funding for any MFCU could be frozen if the unit fails to deliver.
“We are going to turn off the money that goes to these anti-fraud units,” Vance said, “if they fail to do their job. And if we continue to find problems, we can turn off other resources within their state Medicaid programs as well.”
This is the broader signal in the story. The California deferral is the headline, but the MFCU audit applies pressure to every state. Expect more aggressive fraud investigations at the state level, more provider revalidation requests, and more attention to Medicaid provider screening across the country.
What the suspension means for Medi-Cal providers and California hospitals
In the short term, Medi-Cal claims continue. The state is responsible for paying providers under state law regardless of when federal matching funds arrive. DHCS has not announced any provider payment slowdown tied to the deferral.
In the medium term, three things change. First, prepayment review will tighten. Expect more documentation requests on hospice, home health, personal care, and high-volume outpatient services. Second, revalidation will speed up. CMS has already asked all 50 states to share how they plan to revalidate Medicaid providers. Third, denial pressure will rise on outlier billing patterns, especially for high-volume specialties.
These shifts come on top of major Medi-Cal changes already in motion. The state restored asset limits on January 1, 2026 ($130,000 for one person, $195,000 for a couple). Medi-Cal raised provider rates to at least 87.5 percent of Medicare for primary care, maternity, and mental health services on January 1, 2026, funded by Proposition 35 and the MCO tax. The new H.R. 1 federal law is also phasing in lower state-directed payments toward Medicare levels, capping provider taxes, and reducing retroactive coverage starting in 2027.
The combination of fraud pressure, rate changes, and federal cuts is the most significant Medi-Cal environment shift in a decade. For deeper context on the rate side, the California Health Care Foundation’s H.R. 1 analysis is a useful read.
What Medi-Cal billing teams should do this week
Five concrete moves protect your revenue cycle while this story plays out.
First, tighten documentation on every Medi-Cal hospice, home health, personal care, and high-volume outpatient claim. Pre-bill validation pays for itself many times over when audit risk is rising.
Second, confirm credentialing and revalidation paperwork is current for every Medi-Cal provider in your group. Expired or stale revalidation is the easiest reason for CMS to escalate.
Third, monitor DHCS guidance daily. Bulletins, provider letters, and policy updates will come fast over the next 90 days.
Fourth, model a 60 to 90 day cash flow scenario assuming Medi-Cal payments could slow. Even a one-week delay in state cash can put a small clinic or rural hospital under pressure. The RCMGen aging AR recovery service covers the playbook for stabilizing AR during a payer slowdown.
Fifth, review your top denial categories now. If hospice, home health, or personal care services are in your top five denial reasons, build a targeted appeal workflow before the audit pressure intensifies. The RCMGen payer-specific denial management service is built for exactly this type of payer-specific pressure.
Medi-Cal Provider Action Checklist
Five steps to protect cash flow during the deferral
The bigger Medi-Cal picture in 2026
The May 13 deferral is the most dramatic event of the year for Medi-Cal, but it sits inside a larger wave of changes. New asset checks for Non-MAGI Medi-Cal applicants started January 1, 2026. Full-scope dental coverage ends for adults with unsatisfactory immigration status on July 1, 2026. Retroactive Medi-Cal coverage drops from three months to two months for most enrollees starting January 1, 2027, and to one month for Medicaid expansion enrollees. New monthly premiums for some enrollees begin July 1, 2027. Copayments up to $35 begin October 1, 2028 for Medicaid expansion enrollees outside of primary, prenatal, pediatric, mental health, and substance use services.
Hospitals and clinics that serve Medi-Cal patients should treat 2026 as a planning year. The deferral story will get the headlines. The slower-moving structural changes will reshape Medi-Cal cash flow for the next decade.
For broader patient billing context, the RCMGen Medicare two-year lookback rule guide covers the federal Medicare side, and the RCMGen community hospital billing guide covers institutional billing fundamentals.
Frequently asked questions
What is the California Medicaid payments suspension?
On May 13, 2026, Vice President JD Vance and CMS Administrator Dr. Mehmet Oz announced that the Trump administration is deferring $1.3 billion in federal Medicaid payments to California. CMS cited fraud concerns in California’s Medi-Cal program, particularly in hospice, home health, and personal care services. The deferral is the largest CMS has ever made.
Why did CMS suspend Medicaid payments to California?
CMS pointed to three main concerns. First, about one-third of all U.S. hospice providers are concentrated in Los Angeles, which CMS views as a fraud risk. Second, California’s spending on personal care and home services has grown at roughly twice the national average. Third, CMS is reviewing expenditures tied to undocumented immigrants. California disputes the methodology and says the action is politically motivated.
How does a federal Medicaid payment deferral work?
A federal deferral is a temporary withholding of federal Medicaid matching funds owed to a state. The state still has to pay its providers under state law, but it does not receive the federal share until CMS releases the funds. This creates short-term cash flow pressure for the state. CMS uses deferrals as leverage while investigating fraud or improper payments.
What is the hospice and home health enrollment moratorium?
On May 13, 2026, CMS imposed a six-month nationwide moratorium on new Medicare enrollment for hospice providers and home health agencies. Existing providers can continue to bill. No new hospices or home health agencies can be added to Medicare during the moratorium.
What is a Medicaid Fraud Control Unit?
A Medicaid Fraud Control Unit, or MFCU, is a state-level investigative agency that detects and prosecutes fraud by Medicaid providers and abuse or neglect of Medicaid patients. Every state has one. CMS is now auditing every MFCU and has warned that federal funding for any MFCU could be frozen if the unit is not aggressively prosecuting fraud.
How does the California deferral affect Medi-Cal providers?
Direct provider payments under Medi-Cal continue for now, since the deferral targets the federal share owed to the state, not provider claims. However, prolonged deferrals can pressure the state to slow or restructure payments. Providers should expect more documentation requests, more pre-payment audits, and tighter scrutiny of high-volume billing.
What should hospitals and clinics do right now?
Tighten documentation on Medi-Cal claims, especially for hospice, home health, personal care, and high-volume outpatient services. Confirm credentialing and revalidation is current. Track DHCS guidance daily. Build a 60 to 90 day cash flow scenario. Review your top denial categories now.
Has CMS deferred Medicaid payments before?
Yes. Earlier in 2026, CMS deferred between $243 million and $350 million in Medicaid payments to Minnesota over similar fraud concerns. The California deferral at $1.3 billion is the largest CMS has ever made. CMS has also approached at least five states with active fraud investigations.
Where to go from here
The next 90 days will tell you whether the California deferral is a one-time pressure tactic or the start of a longer fraud-driven push across multiple states. Either way, the operational moves are the same. Strong documentation, current credentialing, tight pre-bill validation, and a real denial management framework are the things that protect Medi-Cal cash flow.
For hospitals, physician groups, and clinics that bill Medi-Cal heavily, RCMGen’s hospital revenue cycle management service and clinic and physician group revenue cycle management page walk through the operational playbook in detail.