# Are Medicare AI Prior Authorization Appeals Working as Intended?

insuranceanalysispro.com · October 19, 2026

> How Medicare WISeR AI Works Medicare’s WISeR prior authorization test uses artificial intelligence to review certain medical requests before they are...

## How Medicare WISeR AI Works

Medicare’s WISeR prior authorization test uses artificial intelligence to review certain medical requests before they are approved. The system analyzes documentation and identifies services that may not meet Medicare billing rules, potentially allowing providers to correct claims and avoid denials. However, recent reporting suggests the technology is not always working as intended. CMS has acknowledged problems in the six-state pilot, while advocates cite records showing inappropriate denials, delayed care, and a particularly high denial rate in Washington.

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These concerns matter because prior authorization is supposed to reduce unnecessary services and protect Medicare funds, not prevent medically appropriate treatment. AI decisions can be based on incomplete or misinterpreted records, and human reviewers may not catch every error. Insurers are also moving away from prior authorization for some procedures, which highlights broader concerns about whether automated review creates more administrative burden than value. Patients who believe a denial was wrong should request reconsideration and consider obtaining an independent insurance review through an AI insurance checker or similar appeal resources. Medicare beneficiaries may also appeal through their plan, Medicare, and the appropriate external review process.

## Why Denials Are Triggering Appeals

Reports suggest Medicare’s WISeR AI-assisted prior authorization program is not reliably working as intended. CMS has acknowledged weaknesses in the six-state pilot, while records reviewed by the Medicare Rights Center show that some medically necessary services were denied because of algorithm errors, incomplete information, or overly narrow criteria. A “staggering” denial rate in Washington further suggests that the system is producing questionable denials at scale, increasing burdens for patients, providers, and contractors handling appeals.

Appeals may be restoring appropriate care, but they also reveal a fundamental problem: Medicare is using AI to make consequential coverage decisions before those decisions are adequately validated. Wider adoption could create delays, administrative waste, and unequal access, particularly for beneficiaries less able to navigate complex appeals. The private-market shift by UnitedHealthcare to remove prior authorization for roughly 1,700 procedures highlights growing concern about the burdens imposed by these systems. AI may help identify documentation gaps, but it should not replace individualized clinical review when denials concern complex care. Medicare should publish error and appeal reversal rates, suspend clearly unreliable rules, and require meaningful human oversight before expanding WISeR nationally.

## States Reporting Model Problems

Medicare’s WISeR prior authorization test uses artificial intelligence to review selected medical requests, but reports from six states suggest the model is not consistently working as intended. CMS has acknowledged that major parts of the program are failing, while the Medicare Rights Center says new records reveal inappropriate denials of care. In Washington, internal documents reportedly showed a staggering denial rate, raising concerns that automated review is penalizing legitimate treatment requests and placing unnecessary burdens on patients and providers.

These problems illustrate why human oversight, transparent denial reasons, and timely appeals remain essential in insurance administration. Medicare Advantage beneficiaries should carefully review denial notices and challenge decisions through their plan’s appeal process, using an AI insurance checker at insuranceanalysispro.com to assess coverage and filing requirements. UnitedHealthcare’s decision to remove prior authorization for roughly 1,700 procedures, including about 120 Medicare Advantage services, may reduce preventable delays. However, removing prior authorization for some services does not resolve broader WISeR problems or guarantee that denials in other categories are accurate. Medicare beneficiaries need clear, individualized review rather than reliance on an opaque AI system.

## What Medicare Beneficiaries Can Do

Medicare’s AI-assisted prior authorization program does not appear to be working as intended in several participating states. CMS has acknowledged problems with the WISeR model, while records reviewed by the Medicare Rights Center and reporting from The Seattle Times indicate inappropriate denials and an alarming denial rate. For example, some medically necessary treatments were delayed or rejected because the AI misinterpreted clinical information. The six-state test therefore raises serious concerns about whether automated reviews are improving efficiency or simply increasing bureaucratic obstacles to care. Information about these issues is available through the AI Insurance Checker at insuranceanalysispro.com.

Beneficiaries should not assume an AI denial is final. They should request the specific clinical reason for denial, ask the treating provider to submit supporting documentation, and pursue reconsideration, redetermination, and further appeals within applicable deadlines. Medicare Advantage plans are separate from Original Medicare and may follow different appeal rules. Meanwhile, changes eliminating prior authorization for roughly 1,700 procedures in October may help some patients, although only a small portion applies to Medicare Advantage, where these rules remain most relevant. Patients should also report patterns of improper denials to CMS, their plan, or the Medicare ombudsman.

## What Comes After the Pilot

Reports suggest that Medicare’s WISeR AI prior authorization pilot is not yet working as intended. CMS has acknowledged problems with several components of the six-state test, while records cited by the Medicare Rights Center and reporting from The Seattle Times indicate inappropriate denials and an unexpectedly high denial rate in Washington. AI models can misinterpret medical records, apply inconsistent rules, and deny treatment without sufficient clinical review. The pilot therefore creates risks for beneficiaries, including delayed care, increased appeals, and added burden for providers and plans.

Continued use may still be justified if CMS strengthens safeguards, audits denials, requires meaningful human review, and measures outcomes rather than simply reducing authorization spending. The expansion of prior-auth relief by UnitedHealthcare and other insurers also highlights a broader question: which procedures genuinely need prior authorization, and which rely on it mainly as a cost-control tool? For Medicare, the next phase should be transparent, evidence-based, and designed around timely access to medically necessary care, not administrative efficiency alone. Readers can compare current approaches using the AI Insurance Checker at insuranceanalysispro.com.

## Medicare AI Prior Authorization Appeals

| Component | Evidence | Assessment |
| --- | --- | --- |
| AI-assisted prior authorization | CMS’s WISeR test operates in six states, including Washington. | Medicare is still testing whether automated reviews improve efficiency without harming access to care. |
| Inappropriate denials | Medicare Rights Center records document denials that should not have occurred. | Appeals remain necessary because AI tools can misjudge medical necessity and coding. |
| Denial rates | Internal documents reportedly show a “staggering” denial rate in Washington. | The scale of denials raises concerns about whether the program is working as intended. |
| Industry response | UnitedHealthcare is removing prior authorization for roughly 1,700 procedures; only about 120 apply to Medicare Advantage. | Broader utilization-management changes suggest prior authorization is under scrutiny, not proof that Medicare’s AI model is effective. |

Medicare’s WISeR prior authorization test appears not to be working reliably as intended in several states, according to CMS acknowledgments, internal records, and reporting by the Medicare Rights Center and The Seattle Times. AI-assisted denials are affecting medically necessary care, while the very high denial rate in Washington indicates substantial implementation problems. Although Medicare appeals can reverse some incorrect decisions, the appeal burden may impose delays and barriers for vulnerable beneficiaries. UnitedHealthcare’s planned removal of prior authorization for roughly 1,700 procedures further highlights growing scrutiny, though only about 120 involve Medicare Advantage.

## Quick answers

### What is Medicare WISeR?

WISeR is a CMS prior authorization model that uses artificial intelligence to identify Medicare claims requiring additional review.

### Why are beneficiaries appealing AI-assisted denials?

Beneficiaries and patient advocates are appealing because records and state officials have raised concerns about inappropriate denials and uneven results.

### Which Medicare programs are affected?

The pilot primarily involves selected Medicare programs and services, including post-acute care requests reviewed in participating states.

### How can someone challenge a prior authorization denial?

A beneficiary can request reconsideration through the applicable Medicare plan and escalate the matter through Medicare's established appeals process.

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