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Virtix Health

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Namestring
Virtix Health
Legal namestring
Virtix Health LLC
Company typeenum
Private
Founded yearstring
-
Descriptiontext

Virtix Health is a Phoenix-based AI healthtech company that provides AI-powered prior authorization services for traditional Medicare under the federal WISeR (Wasteful and Inappropriate Service Reduction) model. The company's core platform uses artificial intelligence and machine learning to review claims and make automated prior authorization determinations for selected Original Medicare services, including skin and tissue substitutes, electrical nerve stimulator implants, and knee arthroscopy, operating across six states (Arizona, New Jersey, Ohio, Oklahoma, Texas, and Washington) covering approximately 30 million Medicare beneficiaries. Virtix Health was selected by CMS's Center for Medicare and Medicaid Innovation (CMMI) as one of six technology Model Participants in what CMS describes as the first Innovation Center model where technology companies serve as the only direct model participants.

The company's go-to-market is exclusively through government procurement rather than traditional sales channels: it was selected through CMMI's vendor selection process and operates as a federal contractor. Its business model is outcome-based rather than fee-for-service — CMS compensates Virtix Health via a percentage of Medicare expenditures averted through denied wasteful or inappropriate care, aligning vendor economics with cost containment rather than transaction volume. The platform has processed claims with disclosed operational results including a 62% initial approval rate in Texas rising to 84% after physician review. Virtix Health is privately held, has 11-50 employees, and operates as Virtix Health LLC with no disclosed funding rounds, institutional investors, or management team details in the source materials.

Short descriptiontext

Virtix Health is a Phoenix-based AI healthtech company providing automated prior authorization reviews for traditional Medicare under the federal WISeR model, operating across six states covering approximately 30 million beneficiaries on an outcome-based compensation model tied to cost savings.

Operating statusenum
Operating
Ownership categoryenum
Headcount rangeband
11–50
akta.pro rankint
HeadquartersPhoenix, United States
HQ citystring
Phoenix
HQ countrystring
United States
HQ regionstring
North America
Markets served

Serves global market

Keyword5 values
prior authorization services, AI claims review, Medicare utilization management, healthcare AI platform, fraud waste abuse detection
Industry2 codes
1Medigap Fraud, Waste & Abuse (FWA) & Payment Integrity
CodeHLAEADAIPrimaryYes
2Medigap Claims Processing & Coordination of Benefits (COB)
CodeHLAEADAGPrimaryNo
NAICS code1 code
  • Other Ambulatory Health Care Services6219
SIC code1 code
  • Hospital & Medical Service Plans6324
Product category
Healthcare AI Prior Authorization Services
Social media profiles1 record
GTM motion1 record

Each record includes

Type, Description, Source

Revenue model1 record
1CMS WISeR Model Compensation
TypeUsage Based
Description

CMS pays Virtix Health a percentage of expenditures from averted wasteful care. Compensation is tied to savings generated through prior authorization denials for services deemed unnecessary or inappropriate under the WISeR model. This creates an outcome-based revenue model where payment is contingent on demonstrated cost savings to Medicare.

startupfortune.com
Marketing channels2 records

Each record includes

Title, Type, Stage, Description, Source

Distribution channels1 record

Each record includes

Title, Type, Scope, Target buyer, Description, Source

Cost components5 values
Technology or R&D, Personnel, Operations, Marketing or Sales, Infrastructure
GTM typeB2B
B2B
Offering typeSoftware
Software
Core offering1 text field

Virtix Health provides AI-driven prior authorization reviews for selected Original Medicare fee-for-service claims under the CMS WISeR (Wasteful and Inappropriate Service Reduction) model, covering skin and tissue substitutes, electrical nerve stimulator implants, and knee arthroscopy services across six states. The company operates as one of six CMS-selected Model Participants and is compensated through a percentage of Medicare savings generated from denied or modified authorization requests.

Differentiator
Functional benefit
Problem solved
Quantifiable outcome1 value
  • Texas initial approval rate of 62% with 84% after physician review
Product overview1 text field

Virtix Health offers an AI-powered prior authorization platform as a WISeR (Wasteful and Inappropriate Service Reduction) Model Participant. The company's core offering provides automated prior authorization reviews for selected Original Medicare services in six states. The platform uses AI and machine learning to evaluate medical claims and determine coverage decisions for services including knee arthroscopy, skin and tissue substitutes, and electrical nerve stimulator implants. Virtix Health operates alongside five other AI healthtech companies (Cohere Health, Genzeon, Humata Health, Innovaccer, and Zyter) within the CMS Innovation Center model, where the company is compensated based on a percentage of expenditures from averted wasteful care.

Product and service2 records
1Virtix Health Prior Authorization Platform
CategoryHealthcare AI / Prior Authorization
Description

AI-powered prior authorization platform that reviews Medicare FFS claims and determines approval or denial for selected medical services, using artificial intelligence and machine learning to evaluate coverage requests, with compensation structured as a percentage of savings from averted wasteful care.

2WISeR Model Prior Authorization Services
CategoryGovernment Healthcare Services
Description

Operational service line delivering prior authorization reviews for skin and tissue substitutes, electrical nerve stimulator implants, and knee arthroscopy services in Original Medicare across six U.S. states as part of the CMS WISeR pilot.

Scale indicator3 records

Each record includes

Type, Value, Description, Source

Partnership1 partner
Strategic tierFlagshipTypeStrategic or Co-development PartnerAnnounced on2026-01-01
Description

Virtix Health was selected as one of six Model Participants by the Center for Medicare and Medicaid Innovation (CMMI) for the WISeR (Wasteful and Inappropriate Service Reduction) prior authorization model. The partnership grants Virtix Health authority to conduct AI-driven prior authorization reviews for selected Medicare FFS services across six states. CMS pays Virtix Health a percentage of savings generated from averted wasteful care. The model runs from January 1, 2026 through December 31, 2031.

Recent move4 records

Each record includes

Date, Type, Title, Description, Source

Expansion highlight4 records

Each record includes

Type, Description

Peers10 records
TypeDirect peer
Description

Cohere Health is one of the other six CMS WISeR Model Participants selected to deliver AI-powered prior authorization for Original Medicare services, operating in the same six-state pilot and competing for the same savings-based compensation structure.

TypeDirect peer
Description

Innovaccer is one of the six CMS WISeR Model Participants. It is a healthcare data and AI platform company with prior authorization capabilities that competes directly with Virtix Health in the same Medicare FFS pilot program.

TypeDirect peer
Description

Humata Health is one of the six WISeR vendors selected by CMS to perform AI-driven prior authorization reviews on Traditional Medicare services, making it a direct competitor under identical contractual and compensation terms.

TypeDirect peer
Description

Genzeon is one of the six CMS WISeR Model Participants, providing AI-enabled prior authorization services for Original Medicare in the same six-state footprint as Virtix Health.

TypeDirect peer
Description

Zyter is one of the six WISeR Model Participants selected by CMS to conduct AI-driven prior authorization reviews for Traditional Medicare services, comparable in scope, geography, and compensation model to Virtix Health.

TypeBroad incumbent
Description

EviCore is a large, established prior authorization and medical necessity review vendor owned by Cigna's Evernorth. While focused primarily on commercial and MA payers rather than Traditional Medicare, it is a broad incumbent offering overlapping utilization management capabilities.

TypeBroad incumbent
Description

Change Healthcare, now part of Optum, is a major incumbent in healthcare payment integrity, claims processing, and utilization review. It serves a much broader market but operates in adjacent functions of Medicare and commercial claims review.

TypeEmerging player
Description

Olive AI builds AI-driven healthcare workflow automation tools that intersect with prior authorization, claims processing, and payment integrity use cases, making it a comparable emerging healthtech AI company operating in the same broader category.

TypeEmerging player
Description

Health Catalyst is a healthcare analytics and AI company whose data infrastructure and analytics capabilities are used for utilization management and payment integrity workflows at provider and payer organizations.

TypeOthers
Description

Surescripts operates the dominant health information network for e-prescribing and clinical intelligence, providing adjacent infrastructure that supports prior authorization and clinical decision-making workflows comparable to those Virtix Health enables.

Market position
Strengths5 records

Each record includes

Headline, Details, Source

Weaknesses5 records

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Headline, Details, Source

Competitive moat4 records

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Type, Details

Key risks5 records

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Key highlights6 records

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Customer concentration

Classification, Details

Named customers1 record

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Segment2 records

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Title, Type, Primary, Description, Pain point addressed, Use case, Source

Ideal customer profile1 record

Each record includes

Profile, Firmographic size, Sales motion, Sales cycle length, Buying structure, Purchase trigger, Buyer persona, Geography, Industry vertical, Primary use case, Description, Pain points, Evidence proof points, Target buyer

Technology focused
Yes
API detail
Has APIbool
No

Docs URL, Description

AI capability3 records

Each record includes

Type, Description, Source

AI maturity
App detail

Has app

Feature2 records

Each record includes

Title, Differentiator, Description, Source

Core technology
Revenue estimate
Valuation estimate
Number of profiles
No data
No data
Funding overview

Funding stage, Last funding date, Total funding USD

Funding rounds

Each record includes

Round, Amount USD, Date, Pre money valuation, Total investors, Investors, News

Investors

Each record includes

Name, Type, Date of entry, Rounds participated, Website

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Each record includes

Name, Acquisition type, Announced date, Completed date, Status, Website, News

Investment

Each record includes

Name, Round, Announced date, Lead investor, Website, News

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Virtix Health

Healthcare AI Prior Authorization Servicesvirtixhealth.com

Virtix Health is a Phoenix-based AI healthtech company providing automated prior authorization reviews for traditional Medicare under the federal WISeR model, operating across six states covering approximately 30 million beneficiaries on an outcome-based compensation model tied to cost savings.

What Virtix Health does

Virtix Health is a Phoenix-based AI healthtech company that provides AI-powered prior authorization services for traditional Medicare under the federal WISeR (Wasteful and Inappropriate Service Reduction) model. The company's core platform uses artificial intelligence and machine learning to review claims and make automated prior authorization determinations for selected Original Medicare services, including skin and tissue substitutes, electrical nerve stimulator implants, and knee arthroscopy, operating across six states (Arizona, New Jersey, Ohio, Oklahoma, Texas, and Washington) covering approximately 30 million Medicare beneficiaries. Virtix Health was selected by CMS's Center for Medicare and Medicaid Innovation (CMMI) as one of six technology Model Participants in what CMS describes as the first Innovation Center model where technology companies serve as the only direct model participants.

The company's go-to-market is exclusively through government procurement rather than traditional sales channels: it was selected through CMMI's vendor selection process and operates as a federal contractor. Its business model is outcome-based rather than fee-for-service — CMS compensates Virtix Health via a percentage of Medicare expenditures averted through denied wasteful or inappropriate care, aligning vendor economics with cost containment rather than transaction volume. The platform has processed claims with disclosed operational results including a 62% initial approval rate in Texas rising to 84% after physician review. Virtix Health is privately held, has 11-50 employees, and operates as Virtix Health LLC with no disclosed funding rounds, institutional investors, or management team details in the source materials.

Virtix Health firmographics

Firmographics
Name
Virtix Health
Legal name
Virtix Health LLC
Website
https://virtixhealth.com
Company type
Private
Operating status
Operating
Headcount range
11–50 employees
Short description
Virtix Health is a Phoenix-based AI healthtech company providing automated prior authorization reviews for traditional Medicare under the federal WISeR model, operating across six states covering approximately 30 million beneficiaries on an outcome-based compensation model tied to cost savings.
Ownership category
akta.pro rank

Virtix Health industry classification

Industry
Product category
Healthcare AI Prior Authorization Services
NAICS
Other Ambulatory Health Care Services (6219)
SIC
Hospital & Medical Service Plans (6324)
akta.pro primary industry
Medigap Fraud, Waste & Abuse (FWA) & Payment Integrity (HLAEADAI)
akta.pro secondary industry
Medigap Claims Processing & Coordination of Benefits (COB) (HLAEADAG)

Keywords

  • Prior authorization services
  • AI claims review
  • Medicare utilization management
  • Healthcare AI platform
  • Fraud waste abuse detection

Where Virtix Health is headquartered

Location

Headquarters

HQ city
Phoenix
HQ country
United States
HQ region
North America

Markets served

Virtix Health business model

Business model
GTM type
B2B
Offering type
Software
Cost components
Technology or R&D, Personnel, Operations, Marketing or Sales, Infrastructure

Revenue model

  1. CMS WISeR Model Compensation: CMS pays Virtix Health a percentage of expenditures from averted wasteful care. Compensation is tied to savings generated through prior authorization denials for services deemed unnecessary or inappropriate under the WISeR model. This creates an outcome-based revenue model where payment is contingent on demonstrated cost savings to Medicare.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Virtix Health product offering

Product offering

Core offering

Virtix Health provides AI-driven prior authorization reviews for selected Original Medicare fee-for-service claims under the CMS WISeR (Wasteful and Inappropriate Service Reduction) model, covering skin and tissue substitutes, electrical nerve stimulator implants, and knee arthroscopy services across six states. The company operates as one of six CMS-selected Model Participants and is compensated through a percentage of Medicare savings generated from denied or modified authorization requests.

Product overview

Virtix Health offers an AI-powered prior authorization platform as a WISeR (Wasteful and Inappropriate Service Reduction) Model Participant. The company's core offering provides automated prior authorization reviews for selected Original Medicare services in six states. The platform uses AI and machine learning to evaluate medical claims and determine coverage decisions for services including knee arthroscopy, skin and tissue substitutes, and electrical nerve stimulator implants. Virtix Health operates alongside five other AI healthtech companies (Cohere Health, Genzeon, Humata Health, Innovaccer, and Zyter) within the CMS Innovation Center model, where the company is compensated based on a percentage of expenditures from averted wasteful care.

Differentiator

Problem solved

Functional benefit

Products and services

  • Virtix Health Prior Authorization Platform AI-powered prior authorization platform that reviews Medicare FFS claims and determines approval or denial for selected medical services, using artificial intelligence and machine learning to evaluate coverage requests, with compensation structured as a percentage of savings from averted wasteful care.
  • WISeR Model Prior Authorization Services Operational service line delivering prior authorization reviews for skin and tissue substitutes, electrical nerve stimulator implants, and knee arthroscopy services in Original Medicare across six U.S. states as part of the CMS WISeR pilot.

Quantifiable outcome

  • Texas initial approval rate of 62% with 84% after physician review

Companies that use Virtix Health

Customer profile

Named customers1 record

Segments2 records

Ideal customer profiles1 record

Virtix Health technology and API

Technology

Technology focussed Yes

API detail

Has API
No
API docs
API detail

Core technology

AI maturity

App detail

AI capability3 records

Feature2 records

Virtix Health partnerships and signals

Strategic signal

Partnerships

One partnership is on record.

  • Centers for Medicare & Medicaid Services (CMS) / CMMIflagshipStrategic or Co-development Partner · 1 January 2026Virtix Health was selected as one of six Model Participants by the Center for Medicare and Medicaid Innovation (CMMI) for the WISeR (Wasteful and Inappropriate Service Reduction) prior authorization model. The partnership grants Virtix Health authority to conduct AI-driven prior authorization reviews for selected Medicare FFS services across six states. CMS pays Virtix Health a percentage of savings generated from averted wasteful care. The model runs from January 1, 2026 through December 31, 2031.

Scale indicators3 records

Recent moves4 records

Expansion highlights4 records

Virtix Health competitors and assessment

Company assessment

Direct peers

  • Cohere Health: Cohere Health is one of the other six CMS WISeR Model Participants selected to deliver AI-powered prior authorization for Original Medicare services, operating in the same six-state pilot and competing for the same savings-based compensation structure.
  • Innovaccer: Innovaccer is one of the six CMS WISeR Model Participants. It is a healthcare data and AI platform company with prior authorization capabilities that competes directly with Virtix Health in the same Medicare FFS pilot program.
  • Humata Health: Humata Health is one of the six WISeR vendors selected by CMS to perform AI-driven prior authorization reviews on Traditional Medicare services, making it a direct competitor under identical contractual and compensation terms.
  • Genzeon: Genzeon is one of the six CMS WISeR Model Participants, providing AI-enabled prior authorization services for Original Medicare in the same six-state footprint as Virtix Health.
  • Zyter (now Quokka): Zyter is one of the six WISeR Model Participants selected by CMS to conduct AI-driven prior authorization reviews for Traditional Medicare services, comparable in scope, geography, and compensation model to Virtix Health.

Broad incumbents

  • EviCore (Evernorth): EviCore is a large, established prior authorization and medical necessity review vendor owned by Cigna's Evernorth. While focused primarily on commercial and MA payers rather than Traditional Medicare, it is a broad incumbent offering overlapping utilization management capabilities.
  • Change Healthcare (Optum): Change Healthcare, now part of Optum, is a major incumbent in healthcare payment integrity, claims processing, and utilization review. It serves a much broader market but operates in adjacent functions of Medicare and commercial claims review.

Emerging players

  • Olive AI: Olive AI builds AI-driven healthcare workflow automation tools that intersect with prior authorization, claims processing, and payment integrity use cases, making it a comparable emerging healthtech AI company operating in the same broader category.
  • Health Catalyst: Health Catalyst is a healthcare analytics and AI company whose data infrastructure and analytics capabilities are used for utilization management and payment integrity workflows at provider and payer organizations.

Others

  • Surescripts: Surescripts operates the dominant health information network for e-prescribing and clinical intelligence, providing adjacent infrastructure that supports prior authorization and clinical decision-making workflows comparable to those Virtix Health enables.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

Virtix Health social profiles

Digital presence

Virtix Health financial estimates

Financial estimate

Revenue estimate

Valuation estimate

Virtix Health leadership team

Management profile

Number of profiles

Virtix Health funding detail

Funding detail

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

Virtix Health M&A and investment

M&A and investment

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Virtix Health

What does Virtix Health do?

Virtix Health provides AI-driven prior authorization reviews for selected Original Medicare fee-for-service claims under the CMS WISeR (Wasteful and Inappropriate Service Reduction) model, covering skin and tissue substitutes, electrical nerve stimulator implants, and knee arthroscopy services across six states. The company operates as one of six CMS-selected Model Participants and is compensated through a percentage of Medicare savings generated from denied or modified authorization requests.

Is Virtix Health a public or private company?

Virtix Health is a private company. It is classified as unknown and is currently operating.

When was Virtix Health founded?

Virtix Health was founded in -1. It employs 11 to 50 people.

Where is Virtix Health based?

Virtix Health is headquartered in Phoenix, United States, in the North America region.

How does Virtix Health make money?

One revenue line is on record: CMS WISeR Model Compensation.

Who are Virtix Health's main competitors?

Direct peers on record are Cohere Health, Innovaccer, Humata Health, Genzeon and Zyter (now Quokka). Broad incumbents are EviCore (Evernorth) and Change Healthcare (Optum). Emerging players are Olive AI and Health Catalyst. Surescripts is listed as an others.

Does Virtix Health have an API?

No public API is recorded for Virtix Health.

What industry is Virtix Health in?

Virtix Health's product category is Healthcare AI Prior Authorization Services. Its primary akta.pro industry code is HLAEADAI, Medigap Fraud, Waste & Abuse (FWA) & Payment Integrity, with a secondary code of HLAEADAG, Medigap Claims Processing & Coordination of Benefits (COB). Its NAICS code is 6219 and its SIC code is 6324.

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Live signals
Ars TechnicaTrump admin using AI to deny medical care for seniors in disastrous experimentThe Trump administration's AI-based WISeR program for Medicare prior authorization has been criticized for denials and delays. Vendors like Virtix denied over half of requests, and CMS pays 25% of averted costs per denial, incentivizing denials. The program's rollout was rushed, with some requests pending for 83 days.MorningstarMedicare is using AI to approve claims. The result has been 'alarmingly high denial rates.'Medicare's AI-driven WISeR program, covering 6.4 million beneficiaries in six states, has produced alarmingly high denial rates and delays. A vendor, Virtix Health, was placed on a corrective action plan for exceeding turnaround times, and another vendor raised readiness concerns. The program, slated to run through 2031, may expand to more conditions.MorningstarMedicare is using AI to approve claims. The result has been 'alarmingly high denial rates.'Medicare's AI-driven WISeR program, covering 6.4 million beneficiaries in six states, has produced alarmingly high denial rates and delays. One vendor, Virtix Health, was placed on a corrective action plan for denying more claims than it approved. The program, slated to run through 2031, faces concerns about vendor readiness and potential expansion.The Seattle TimesMedicare AI program made them suffer in pain. Now they want answersMedicare patients in Washington and five other states are experiencing significant delays and denials for medical treatments due to the WISeR (Wasteful and Inappropriate Services Reduction) AI-enabled prior approval program launched by the Centers for Medicare and Medicaid Services at the start of 2026, which requires doctors to obtain approval through third-party company Virtix Health before performing certain procedures. The program, covering over a dozen treatments for conditions including back pain, arthritis, and incontinence, has been overridden clinical judgments, with doctors reporting blanket denials, weeks-long appeals processes, and increased administrative burdens while patients wait in pain. Lawmakers including Rep. Suzan DelBene are scrutinizing the program and sponsoring legislation to overhaul it, after the Government Accountability Office determined CMS may have failed to follow proper procedure by not submitting the program to Congress for review before implementation.Startup FortuneMedicare is giving AI health startups a real payment test – Startup FortuneMedicare's WISeR (Wasteful and Inappropriate Service Reduction) model, which began on January 1, 2026 and runs through December 31, 2031, is giving six AI healthtech companies a direct role in reviewing selected Original Medicare services across six states, making it the first Innovation Center model where technology companies are the only model participants. The six named companies—Cohere Health, Genzeon, Humata Health, Innovaccer, Virtix Health, and Zyter—are embedded in a payment review process covering skin and tissue substitutes, electrical nerve stimulator implants, and knee arthroscopy services, with CMS paying them a percentage of expenditures from averted wasteful care. The model represents both a significant business opportunity for AI health startups to access public reimbursement infrastructure and a reputational risk, as critics worry prior authorization could delay needed care and replicate Medicare Advantage complaints in traditional Medicare.Today on MedscapeMedicare’s WISeR Prior Authorization Model: Is It Wise?The Centers for Medicare & Medicaid Services (CMS) launched the WISeR (Wasteful and Inappropriate Service Reduction) prior authorization model on January 1, 2026, in six states (Arizona, New Jersey, Ohio, Oklahoma, Texas, and Washington), fundamentally shifting traditional Medicare toward a managed-care style system. The model uses for-profit tech vendors—including Cohere Health, Genzeon, Humata Health, Innovaccer, Virtix Health, and Zyter—that employ AI and machine learning to review claims, with compensation tied to a share of savings generated, which critics argue creates perverse incentives to deny care. Physicians report severe operational problems including universal denials of epidural steroid injections despite valid authorizations, with an interventional pain specialist calling the system "completely nonfunctional and unsustainable."SubstackInside CMS’s Troubling WISeR Vendor List and the Power It Hands to Private ContractorsCMS has announced the six private companies selected to participate in the WISeR (Wasteful and Inappropriate Service Reduction) Model starting January 1, 2026, which will allow these contractors to use AI to process prior authorizations for traditional Medicare patients. The selected companies—Cohere Health, Genzeon Corporation, Humata Health, Innovaccer, Virtix Health, and Zyter—will have authority over coverage decisions for 17 medical procedures previously requiring no prior authorization. Critics raise concerns that most participants are backed by insurer-linked venture funds or staffed by former insurance executives, creating potential conflicts of interest, and that several are pure technology companies without medical oversight, raising questions about regulatory compliance.EnsemblehpThe WISeR Model: Using AI in a New Era of Medicare Prior AuthsThe Centers for Medicare & Medicaid Services (CMS) is launching the WISeR (Wasteful and Inappropriate Service Reduction) Model on January 1, 2026 — a six-year initiative using AI and machine learning to implement prior authorization for select Medicare FFS services in six states (Arizona, New Jersey, Ohio, Oklahoma, Texas, Washington) to combat fraud, waste, and abuse. CMS has selected six technology companies as Model Participants to perform AI-driven prior authorization reviews: Cohere Health, Inc., Genzeon Corporation, Humata Health, Inc., Innovaccer Inc., Virtix Health LLC, and Zyter Inc. The model faces significant opposition, with Democrats in the U.S. House introducing legislation to repeal it, the American Hospital Association urging a six-month delay, and lawmakers warning that AI-driven prior authorization could delay or deny necessary care for Medicare beneficiaries.