Medicaid Block Grants vs. Per Capita Caps: The Funding Cuts Hidden in Fiscal Year Language

Congress is debating two restructuring mechanisms that would permanently cut Medicaid. Neither is a minor adjustment. Block grants would freeze federal funding at a fixed dollar amount per state, eliminating the federal-state cost-sharing partnership that has defined Medicaid since 1965. Per capita caps would limit federal spending to a fixed dollar amount per enrollee, adjusted only for inflation (measured by CPI-medical, the slowest-growing price index available). The Congressional Budget Office projects the block grant scenario would cut $600 billion or more over ten years; per capita caps, perhaps $400-$500 billion. But the real story is neither the dollar figure nor the mechanism. It's the outcome: states face budget crises they cannot solve without cutting enrollment or slashing benefits.

How Block Grants Work—And Why They Eliminate the Federal Guarantee

Currently, Medicaid is an entitlement. Federal law requires the federal government to match state spending at a legislated rate (FMAP—Federal Medical Assistance Percentage). That rate varies by state (richer states get 50% federal match; poorer states get up to 77%). But the structure is automatic: if enrollment grows, federal spending grows. If medical costs rise, federal spending rises. The partnership adjusts.

Block grants eliminate that partnership. Congress would allocate each state a fixed lump sum annually. The block grant might grow 1% or 2% yearly—slower than enrollment growth or medical inflation. Once the block is spent, the state pays all additional costs. A state with growing enrollment faces a choice: raise taxes to cover overages, cut other programs, or restrict Medicaid eligibility and benefits. Most states choose option three. If California's block grant doesn't keep pace with growth in its Medicaid population, California cuts income eligibility limits, drops optional services like dental, reduces provider payments, or imposes work requirements.

Per Capita Caps: The Softer-Looking Cut With the Same Outcome

Per capita caps sound more stable. The federal government would pay a fixed amount per enrolled Medicaid beneficiary, adjusted annually by CPI-medical (the medical portion of the Consumer Price Index, which grows roughly 2-3% annually). That's slower than enrollment-driven growth but faster than a frozen block grant. Yet the mathematics are identical in outcome: when medical costs exceed the cap growth, states absorb the difference. When enrollment among disabled or elderly beneficiaries (whose costs are highest) expands, the cap doesn't expand enough to cover them. States respond by restricting enrollment or limiting benefits.

The difference between block grants and per capita caps is subtle but real. Per capita caps theoretically adjust for enrollment changes (more enrollees = slightly higher federal payout). Block grants ignore enrollment entirely. But both create the same state-level problem: fixed federal dollars meeting unlimited cost growth. The result: enrollment restrictions.

Which States Face the Deepest Cuts?

States that expanded Medicaid under the ACA are hit hardest. These states—California, New York, Illinois, Florida, Texas, Ohio, Pennsylvania, North Carolina—added millions of adult enrollees at 138% of federal poverty level. They benefited from the 90% federal match (the ACA's most generous match). Under block grants or per capita caps, that 90% match disappears. States revert to standard matching rates (50-77%). Simultaneously, their federal allocation doesn't grow with enrollment. The result: California and New York lose tens of billions over ten years. Smaller states lose proportionally less in dollars but face similar percentage cuts.

Non-expansion states (Texas, Florida, Georgia, South Carolina, Mississippi, Wyoming) lose less because they covered fewer people to begin with. But the per capita cap still creates pressure on their existing Medicaid populations.

The CHIP Problem: Children's Coverage Caught in the Restructuring

The Children's Health Insurance Program (CHIP) funds coverage for children in families earning above Medicaid limits but below 200-250% of poverty (by state). Block grants or per capita caps to CHIP create the same problem: fixed federal dollars, growing enrollment and costs. If Congress applies the same restructuring to CHIP that it applies to Medicaid, 2.3 million children would be at risk. States would likely tighten income eligibility or impose premiums and cost-sharing. CHIP serves as a safety net for working families; restructuring CHIP would destabilize that net.

Behavioral Health Carve-Out: Mental Health and Substance Use Separate From the Cap

Some proposals would carve behavioral health (mental health and addiction treatment) out of the per capita cap, placing it under a separate payment mechanism or allowing states greater flexibility. This sounds like a win for mental health funding. In practice, carve-outs create their own problems. Carved-out services get managed separately, creating coordination gaps and incentivizing states to move costs between the carved and non-carved systems. A state might restrict medical Medicaid benefits while expanding behavioral health coverage on paper, then fail to pay for the behavioral health services, creating paper coverage that doesn't translate to real access.

How This Differs From ACA Expansion Baseline

The ACA Medicaid expansion (2014 onwards) offered 90% federal matching for newly eligible adults. That created an incentive for states to expand. Block grants and per capita caps would eliminate that incentive by using lower, standard matching rates. States that expanded regret it financially under the new structure. Newly eligible adults lose coverage disproportionately because the federal commitment that funded them disappears. The baseline shifts downward: instead of 138% of federal poverty level as the eligibility floor, states revert to lower pre-ACA levels (60-75% of poverty in many states).

Historical Context: Why 2017 Block Grant Proposal Failed

The American Health Care Act of 2017 (AHCA), championed by the Trump administration, proposed block grants and per capita caps. CBO projected it would reduce Medicaid enrollment by 14 million by 2026. That estimate, combined with public outcry from patient advocates and hospitals, sank it. The House passed AHCA; the Senate did not. Key Senate Republicans cited coverage losses as the reason. Yet the 2026 proposal is structurally similar. The difference: Congress may not produce a CBO score that quantifies coverage loss as explicitly as 2017. Or it may ignore the score. Either way, the outcome would be identical.

What Advocacy Groups and the CBO Actually Say

The Congressional Budget Office projects $600 billion in savings from block grants over ten years. That figure means $600 billion less federal spending. States must fill the gap through tax increases, cuts to other programs, or Medicaid cuts. CBO also projects this would reduce Medicaid enrollment by approximately 5-8%, depending on the variant (block grants produce larger enrollment reductions than per capita caps).

Advocacy groups—the Center on Budget and Policy Priorities, the Kaiser Family Foundation, the American Hospital Association, the American Medical Association—all argue that block grants and per capita caps would reduce coverage and destabilize provider networks. Hospitals say they'll be forced to cut emergency services in rural areas; doctors say reimbursement cuts will drive them away. These aren't partisan claims. They're observations about structural incentives: when federal funding is capped and costs continue rising, states have only three options, all of which harm coverage or access.

The Practical Timeline: When These Changes Would Hit

If included in reconciliation legislation, block grants or per capita caps would likely take effect in 2027 or 2028, with a transition period. States would immediately begin planning eligibility and benefit changes. By 2027, beneficiary notices would be mailed. By 2028, coverage would begin narrowing. The first wave of disenrollment would occur among adults earning above the new income thresholds—roughly those earning above 100-110% of federal poverty.

Key Takeaway: Both Mechanisms Produce the Same Result

Whether Congress chooses block grants or per capita caps, the outcome is predictable. Federal funding becomes fixed or grows slowly. State costs continue rising. States choose between raising taxes, cutting other programs, or restricting Medicaid. Most choose option three. Block grants compress the timeline (faster coverage loss); per capita caps slow it slightly (enrollment loss spreads over more years). But both produce a two-tier system: federal baseline coverage that's narrower, more limited, and tilted toward the disabled and elderly; and optional coverage that states drop during budget constraints. If you earn above poverty but below 138% FPL, if you depend on dental or vision coverage, if you live in a high-expansion state, you're in the zone of vulnerability.