The evidence this hub documents does not resolve into a single policy conclusion. The $84 billion annual overpayment, the prior authorization denial record, the network adequacy gaps, the disenrollment pattern at the end of life — each of these is a documented problem. What to do about them is a question on which serious people hold different positions, and this article presents those positions as honestly as the evidence allows.
The reform proposals span a wide range. At one end are administrative and regulatory adjustments — improving audit methodology, tightening prior authorization rules, extending Medigap protections — that work within the existing Medicare Advantage structure. At the other end are structural proposals that would substantially reduce or eliminate the program. In between are payment rate reforms, transparency requirements, and public option proposals that would change the competitive dynamics around MA without eliminating it.
Each proposal addresses real documented problems. Each has genuine limitations. The political obstacles each faces are also real and are documented throughout this hub. This article presents the full spectrum.
RADV Audit Reform
The Risk Adjustment Data Validation audit is CMS’s primary tool for verifying that the diagnosis codes MA plans submit for risk-adjusted payment are actually supported by medical records. Early RADV audit results found average overpayment rates of over 10 percent of risk-adjusted payments for audited plans. The program has recovered a fraction of the estimated overpayment.
What reform would do: Strengthening the RADV program — expanding audit scope, tightening methodology, accelerating timelines, and establishing clear rules for extrapolating audit findings to recover systemic overpayments — would increase recovery of documented improper payments. The Bipartisan Policy Center estimated in 2025 that simply improving risk adjustment to exclude in-home health assessment data and use two years of diagnostic data would save approximately $124 billion over ten years, per CBO. [Editorial note: verify against BPC November 2025 paper and underlying CBO estimate before publication.] Strengthening the coding intensity adjustment from the current 5.9 percent minimum to 20 percent could reduce Medicare spending by more than $1 trillion over ten years (CBO, December 2024). [Editorial note: verify against CBO December 2024 options document before publication.]
The honest limitation: RADV audit reform addresses the coding intensity component of the overpayment — the portion generated by inflated diagnosis documentation. It does not address the benchmark rate component — the $13 billion additional overpayment embedded in the payment structure by the Medicare Modernization Act of 2003. Recovering documentation-based overpayments through audit does not change the payment architecture that rewards diagnosis over treatment. The incentive structure that produced the fraud remains intact; audit reform makes the fraud less profitable, not irrational.
The political obstacle: The insurance industry has litigated RADV methodology at every opportunity. CMS’s ability to extrapolate audit findings to contract-wide overpayment recovery was contested in litigation for years. Industry lobbying has consistently worked to limit audit scope and slow implementation. The enforcement capacity required for a RADV program operating at the scale of the documented problem is substantially greater than what has been deployed.
Prior Authorization Reform
The Improving Seniors’ Timely Access to Care Act has been introduced in successive Congresses with strong bipartisan support. It passed the House unanimously in the 117th Congress. It was reintroduced in the 119th Congress (H.R.3514 and S.1816, introduced May 20, 2025) and as of December 2025 had 238 House co-sponsors and 63 Senate co-sponsors — a majority of the House and a supermajority of the Senate. Both bills were referred to committee: the House bill to the Energy and Commerce Committee and Ways and Means Committee; the Senate bill to the Finance Committee. Neither had received a committee vote as of this writing.
The bill would establish electronic prior authorization standards for MA plans, reduce decision timelines, require reporting on denial and approval rates, and encourage adherence to evidence-based guidelines. It would codify and extend the CMS 2024 Interoperability and Prior Authorization rule, which required MA plans to use Medicare coverage criteria for PA decisions.
What reform would do: Electronic PA standards would reduce the administrative burden on providers and accelerate decision timelines. Reporting requirements would create transparency on denial rates by plan and service type that does not currently exist in standardized, publicly comparable form. Requiring adherence to Medicare coverage criteria removes the most clearly documented mechanism — plan-specific criteria more restrictive than Medicare’s — that OIG identified as a primary driver of improper denials.
The honest limitation: PA reform addresses the process and criteria of coverage denial without changing the financial incentive to deny. An MA insurer required to use Medicare coverage criteria and respond electronically within defined timelines still receives a fixed capitated payment and still benefits financially from minimizing care delivered relative to that payment. The incentive that produces the denial behavior is the capitated payment structure itself. PA reform constrains the expression of that incentive; it does not eliminate it. The enforcement capacity question — how CMS monitors compliance across hundreds of plans processing millions of PA requests annually — also remains.
The political obstacle: The bill stalled in committee in the 118th Congress despite broad co-sponsor support, in part due to a $16 billion ten-year CBO score — the cost of the additional care that would be approved under reformed criteria. That cost estimate is simultaneously an argument against the bill (it costs money) and an argument for it (the $16 billion represents care that is currently being denied to beneficiaries who qualify for it). The 119th Congress reintroduction with 238 House and 63 Senate co-sponsors gives the bill strong nominal support; whether it advances from committee is not determined at this writing.
Network Adequacy Reform
CMS strengthened MA network adequacy standards through a series of rulemakings in 2022 and 2023, codifying time and distance requirements in regulation and expanding the review scope for new and expanding plan applications. The 2023 final rule added clinical psychology and clinical social work to the specialty types subject to network adequacy evaluation.
What reform would do: More aggressive network adequacy standards — requiring MA plans to include high-volume academic medical centers, major cancer centers, and subspecialty facilities in their networks or demonstrate equivalence — would reduce the documented pattern of MA beneficiaries being unable to access the most specialized care in their regions. Standardized, publicly available network data would allow beneficiaries to evaluate network depth before enrollment rather than discovering gaps at diagnosis.
The honest limitation: Network adequacy standards define a floor; they cannot require that every MA plan include every provider. The financial logic that leads MA plans to exclude high-cost specialized facilities operates within whatever floor is set — plans will meet the minimum and optimize below it. The enforcement capacity constraint documented in Article 09 (CMS reviewed less than 1 percent of existing MA networks annually in 2013–2015) limits how completely any standard translates to actual network composition on the ground.
Medigap Guaranteed-Issue Reform
As Article 11 documents, the lock-in that prevents seriously ill MA enrollees from accessing traditional Medicare is the Medigap underwriting barrier — the ability of Medigap insurers in most states to deny coverage or charge higher premiums based on health status to beneficiaries who have left MA. Four states (Connecticut, Maine, Massachusetts, and New York) require guaranteed-issue protections that eliminate this barrier. Forty-six states do not.
Multiple proposals would extend Medigap guaranteed-issue protections nationally:
Federal floor extension: Extending the federal guaranteed-issue floor to MA disenrollees regardless of health status would replicate the protection available in CT, ME, MA, and NY nationwide. The USC Schaeffer Institute and Center for American Progress have documented the case for this reform and its implementation pathways.
The birthday rule: Several states have adopted birthday rule provisions allowing Medigap enrollees to switch plans annually without underwriting on their birthday. A version of this applied to MA disenrollees would reduce the lock-in without requiring full guaranteed-issue.
What reform would do: Removing the Medigap underwriting barrier for MA disenrollees would enable seriously ill beneficiaries to access traditional Medicare’s unrestricted provider access when their health status makes MA’s limitations most consequential. The Health Affairs 2025 evidence documents that disenrollment doubles in states with these protections — indicating significant suppressed demand from beneficiaries locked into MA by the underwriting barrier.
The honest limitation: The four states with existing guaranteed-issue protections have higher Medigap premiums — adverse selection into Medigap (healthier people staying in MA, sicker people buying Medigap upon diagnosis) raises premiums for all Medigap enrollees. Federal extension of guaranteed-issue would need to address this premium effect, potentially through risk adjustment for Medigap markets. The coverage map notes this as a design challenge, not an argument against the reform.
Payment Rate Reform
MedPAC has recommended for years that MA benchmark rates be recalibrated to eliminate the structural overpayment embedded in the 2003 payment structure. The commission’s March 2025 report documented the $84 billion annual overpayment and the components attributable to above-market benchmark rates and coding intensity. CBO has estimated the savings available from various rate reform approaches:
- Increasing the coding intensity adjustment from 5.9 percent to 8–20 percent: $200 billion to $1.3 trillion through 2035
- Reducing MA benchmark rates by 10 percent overall: over $600 billion through 2035
What reform would do: Payment rate recalibration that brought MA rates into alignment with what covering the same beneficiaries under traditional Medicare would cost would eliminate the financial subsidy embedded in the current payment structure — the margin that funds extra benefits, broker commissions, executive compensation, and shareholder returns from what is nominally a more efficient private alternative to traditional Medicare.
The honest limitation: Reducing MA payment rates would reduce the margin available for extra benefits. Plans in markets where the payment reduction made MA financially unattractive to insurers would exit — as they did under Medicare+Choice when rates were constrained in the late 1990s. Beneficiaries in those markets would need to find alternative coverage. The political backlash from plan exits and benefit reductions has historically been sufficient to slow or reverse rate reform, regardless of the evidence supporting it.
The political obstacle: The ACA’s 2010 provisions to reduce MA overpayments — projected to save $156 billion over ten years by CBO (2012) — were substantially eroded within two years through industry lobbying and the introduction of a quality bonus payment program that restored a significant share of the projected savings. The payment rate trajectory since 2003 is a record of rate reform attempts being reversed or blunted. Each administration that has proposed rate reductions has faced the same political dynamic: 33 million enrollees receiving insurer communications about threats to their benefits, 220 lobbyists on Capitol Hill, and $330 million in lobbying over five years.
The Public Option
Proposals for a Medicare public option — a government-administered health insurance plan available for purchase by individuals and employers, typically structured as an extension of Medicare — interact with Medicare Advantage in complex ways.
A Medicare public option available to all Americans would create an alternative to private insurance that competed with MA plans, among others. Whether this strengthens or weakens the case for MA-specific reform depends on design. A robust public option with comprehensive benefits, unrestricted provider networks, and administrative costs similar to traditional Medicare’s would offer MA enrollees a genuinely comparable alternative — allowing them to evaluate the MA trade-offs with an exit option available. A limited public option with constrained eligibility or higher premiums might create a less competitive pressure on MA plans.
The adverse selection dynamics of a voluntary public option alongside MA are complex. If the public option attracted primarily sicker beneficiaries — those for whom MA’s restrictions are most consequential — it would face adverse selection pressures that would affect its sustainability. The design question of whether the public option is available at Medicare-equivalent administrative cost or whether it must be actuarially self-sustaining affects what it can offer and whom it attracts.
MA Elimination and Medicare Expansion
The Medicare for All proposals introduced by Senator Sanders in successive Congresses would eliminate Medicare Advantage as a category. Under a single-payer system covering all Americans, there is no MA payment structure, no capitated rate to insurer, no risk adjustment mechanism to exploit. The program ceases to exist as a matter of structural logic, not as a targeted reform decision. The Single-Payer Healthcare hub covers the full range of single-payer proposals and their evidence base.
Incremental Medicare expansion proposals — lowering the Medicare eligibility age, establishing a Medicare buy-in option for individuals in the pre-Medicare years, expanding Medicare to cover dental, vision, and hearing universally — interact with MA in different ways. Lowering the eligibility age expands the Medicare population but does not change the MA payment structure for the existing Medicare population. Expanding Medicare dental, vision, and hearing coverage would remove the primary enrollment hook that drives MA advertising — if traditional Medicare covered those benefits, the MA value proposition would be substantially reduced and enrollment patterns would likely shift.
The Political Economy of Reform
The reform spectrum described above operates within a political context that this hub has documented throughout. MA has 33 million enrollees who receive regular communications from their insurers about the program and its benefits. The industry employs more than 220 lobbyists on Capitol Hill and has spent more than $330 million on lobbying over a five-year period. Campaign contributions flow to members of the relevant committees in both parties.
The evidence that the program costs more and delivers less than traditional Medicare has been available for most of the two decades since the MMA 2003 payment structure was enacted. Each reform attempt — the ACA’s rate provisions, the RADV audit methodology, the CMS marketing rules — has generated organized industry resistance that has limited or reversed the reform’s effect.
That political record does not mean reform is impossible. It means reform proposals need to be evaluated not only on their technical merits — what they would accomplish if fully implemented — but on their political viability and their track record against the resistance they predictably generate.
What the evidence resolves about Medicare Advantage — what the program costs, what it produces, and what the mechanisms are — is the subject of the final article.
The complete Medicare Advantage series
01 — What Medicare Advantage Actually Is — and How It Replaced Traditional Medicare
02 — The Political History: How Private Insurers Got Into Medicare
03 — The Marketing Machine: How Enrollment Works and Who It Targets
04 — Risk Adjustment: The Payment System That Rewards Diagnosis, Not Treatment
05 — The $84 Billion Overpayment: How Upcoding Works at Scale
06 — The Profit Extraction Model: What Insurers Take Before Care Is Delivered
07 — Prior Authorization in Medicare Advantage: What OIG Found
08 — The Denial and Appeals Record: What Happens When Enrollees Push Back
09 — Network Adequacy and the Coverage Gap
10 — The Extra Benefits Myth: Dental, Vision, and What the Fine Print Says
11 — When Medicare Advantage Fails: Disenrollment at the End of Life
12 — The Reform Proposals: From Audit Reform to Elimination
13 — What the Evidence Resolves — and What It Doesn’t
This article was researched and drafted with AI assistance under human review. See our full AI and editorial practices.