Original Medicare’s New AI Prior-Authorization Pilot: What Patients in 6 States Should Know

Original Medicare has not adopted broad nationwide prior authorization. But as of January 2026, a limited pilot called WISeR is now affecting some Medicare patients in six states: Arizona, New Jersey, Ohio, Oklahoma, Texas, and Washington.

For people in those states, the practical question is simple: if you are planning certain outpatient procedures, implants, or wound-care services, your care team may now have to clear that service through a new review process before care is delivered or before Medicare pays the claim.

That matters because delays in review can affect scheduling, stress, and out-of-pocket planning. It also matters because WISeR is one of the first times Original Medicare has tested AI-supported prior review in this way. CMS says the pilot is meant to curb unnecessary or inappropriate care without changing Medicare’s actual coverage rules. Critics agree the pilot is limited, but they worry it could still add harmful friction if the technology and human review are not handled carefully.

What WISeR is, and where it applies

WISeR stands for Wasteful and Inappropriate Service Reduction. CMS launched the model on January 1, 2026, with operational prior-authorization requests starting January 5, 2026, for services scheduled on or after January 15, 2026.

The pilot applies only in six states and only to people in Original Medicare, also called fee-for-service Medicare. It does not apply nationwide. It also does not apply to Medicare Advantage. CMS also says Medicare’s coverage and payment rules themselves have not changed.

That last point is important. WISeR does not create a new Medicare benefit, remove an existing benefit, or change who can see which doctor. Patients in Original Medicare still keep their usual freedom to use a Medicare provider or supplier of their choice. What changes is the review process for a narrow set of services in those six states.

Which services are affected, and what is excluded

CMS says WISeR targets a limited group of services that already have published Medicare coverage criteria and have raised concerns about fraud, waste, abuse, or inappropriate use. Public CMS materials highlight examples such as skin and tissue substitutes, implantation of electrical nerve stimulators, and knee arthroscopy for knee osteoarthritis.

The operational guide shows the list is broader than those three examples. It includes selected nerve stimulation procedures, some incontinence-control devices, penile prosthesis procedures, certain vertebral augmentation procedures, some epidural steroid injections for pain management, selected cervical fusion services, hypoglossal nerve stimulation for obstructive sleep apnea, and some lower-extremity wound-care skin substitute services.

Even so, this is still not every Medicare service, and it is not every service inside those broad categories. CMS narrows some WISeR services by billing code, diagnosis, and site of care. In plain English, that means a procedure name alone may not tell you whether WISeR applies. The details matter.

CMS says WISeR applies in hospital outpatient departments, ambulatory surgery centers, offices, and some home settings. It excludes inpatient-only services, emergency services, and services that would create substantial risk if delayed. CMS also delayed implementation of deep brain stimulation and a spinal-stenosis decompression service, so those were not part of the model when it began.

What has not changed for patients

Several basics remain the same:

Original Medicare’s underlying coverage rules have not changed.
Payment rules for covered services have not changed.
This is not a new requirement for all Medicare patients or all Medicare services.
Appeal rights on denied claims still exist under the usual Medicare process.

Just as important, CMS says technology alone is not supposed to make a non-affirmation. In CMS’s description, vendor technology may help review requests, but recommendations against payment must be reviewed by human clinicians with relevant expertise before they are issued.

How the WISeR process works

For patients, the easiest way to think about WISeR is that your doctor, facility, or supplier now has two basic paths for a covered WISeR service.

Path 1: Prior authorization before the service. Your provider can send records in advance. If the request is affirmed, CMS says that approval is generally valid for 120 days. If the service is pushed beyond that window, a new request may be needed.

Path 2: No advance request. A provider can still deliver the service without getting prior authorization first, but the claim can then be suspended for pre-payment medical review before Medicare pays it.

Under the CMS operational guide, standard WISeR review is generally supposed to take about three calendar days after the reviewer receives a complete initial request or resubmission. Expedited review is available when delay could seriously jeopardize life, health, or the ability to regain maximum function, and those decisions are supposed to come within two days if the request qualifies. CMS also says expedited requests should be uncommon because the model is aimed at nonemergency services.

If a request is provisionally affirmed, that means the service appears to meet Medicare’s existing coverage rules, assuming the claim is billed correctly and no new conflicting information emerges.

If a request is non-affirmed, that is not the same thing as a final Medicare appeal decision. It is a preliminary finding that the future claim likely would not meet Medicare coverage, coding, or payment requirements as submitted.

CMS says non-affirmed requests can be resubmitted, and there is no set limit on the number of resubmissions before a claim is filed. Providers can also ask for peer-to-peer clinical review during resubmission, meaning they can discuss the case with a clinician who has relevant specialty expertise. CMS says patients should receive a copy of a non-affirmation, and the reviewer is supposed to provide the reasons for the decision and instructions for resubmission.

If a provider goes ahead with care after a non-affirmation and then bills Medicare, the Medicare Administrative Contractor can deny payment. That denial is the point where the usual Medicare claims appeal rights kick in.

Why some experts and clinicians are concerned

It is too early to say whether WISeR itself is helping or harming patients. There is not yet published evidence showing that this pilot has already caused patient harm, and readers should be careful not to assume that from the broader debate.

Still, the concern is not theoretical. A recent systematic review of 25 published studies found that prior-authorization requirements more broadly were associated with delays in care, disease worsening, preventable hospitalizations, longer hospital stays, and lower disease-free survival in some cancer settings. That review pulled together evidence across multiple specialties, but it was not a WISeR study, and much of the evidence came from observational and retrospective research rather than randomized trials. So it supports caution, not a verdict on this Medicare pilot.

Independent analysts at KFF have also pointed out that WISeR expands prior authorization into traditional Medicare, where it has historically been rare. KFF notes that the pilot starts small, but the bigger open question is whether CMS can make the process fast and accurate enough to avoid repeating the delays and administrative headaches seen in other parts of the insurance system.

Provider groups have raised a related concern about how meaningful the required human review will be in practice. The American Hospital Association has argued that AI-assisted review needs strong guardrails, transparent oversight, and real physician involvement, not a quick sign-off after an algorithm recommendation. The group also warned that older submission methods, documentation demands, and vendor-specific workflows could add burden for clinics and hospitals.

Another reason this issue gets close attention: CMS pays WISeR vendors based in part on savings linked to reducing wasteful or inappropriate care. CMS says vendors can also face penalties, payment reductions, recoupments, or removal from the model for inaccurate non-affirmations. Supporters see that as oversight. Critics worry the savings incentive could still pressure reviews in the wrong direction if auditing is weak or slow.

What patients and families should do if a service is flagged

If you live in one of the six WISeR states and have a planned procedure, implant, or wound-care service, a few steps can make the process easier to navigate:

Ask early whether WISeR applies. Do not assume it does just because of the procedure name, and do not assume it does not. Ask your doctor’s office or facility whether your exact service, diagnosis, and setting fall under WISeR.
Ask which path your provider is using. Find out whether they are seeking prior authorization in advance or planning to let the claim go through pre-payment review later.
Confirm whether your case should be treated as urgent. If delay could seriously harm your health or recovery, ask whether expedited review is appropriate and how that was documented.
Keep a paper trail. Write down the date the request was submitted, the expected response date, the name of the office contact, and any tracking or reference number you receive.
Request the written reason for any non-affirmation or payment denial. You will need the explanation to understand whether missing records, coding issues, or medical-necessity questions are the problem.
Ask whether a resubmission or peer-to-peer review is the next best step. Sometimes the fastest solution is correcting documentation rather than jumping straight to a claim denial.
If a claim is denied, ask about appeal deadlines right away. Medicare appeal rights still matter, but timing matters too.
If your procedure is scheduled far out, ask whether the approval window will still be valid. An affirmed request is generally valid for 120 days.

What this means for readers

For most Medicare patients nationwide, nothing has changed. But for people in Arizona, New Jersey, Ohio, Oklahoma, Texas, and Washington who need one of the selected services, WISeR is now part of the system.

The key takeaway is that this is a limited pilot, not a wholesale rewrite of Original Medicare. CMS says the model keeps existing coverage rules and appeal rights in place and requires clinician involvement before non-affirmations are issued. At the same time, outside experts are right to watch closely. Prior authorization can create delays when it is poorly designed, and it is still unknown whether AI-assisted review in this pilot will reduce unnecessary care safely or add new obstacles for patients who need timely treatment.

If you are affected, ask questions early, keep records, and do not treat a non-affirmation as the end of the road. Under WISeR, the details of documentation, urgency, resubmission, peer review, and appeals can make a real difference.

Sources

This article is for general informational purposes only and is not medical advice. Research findings can be early, limited, or subject to change as new evidence emerges. For personal guidance, diagnosis, or treatment, consult a licensed clinician. For current outbreak or public health guidance, follow your local health department, the CDC, or another relevant public health authority.