Cardiology Prior Authorization in 2026: Why Imaging and Procedures Face More Scrutiny

If it feels like your cardiology practice is spending more hours on prior authorization than it did a couple of years ago, you're not imagining it. Something has genuinely changed in how payers, and now Medicare itself, decide whether to pay for cardiac imaging and procedures before they'll even schedule them.

Coronary CT angiography, nuclear stress tests, cardiac MRI, echocardiograms, elective PCI. All of it is running into longer approval windows, heavier documentation asks, and more denials on the first try. Cardiology societies are pushing back in public. Maryland and a handful of other states have started writing new rules around how insurers can use AI to make coverage decisions. And CMS just launched a Medicare pilot that uses artificial intelligence to review claims, which is not something anyone would have predicted for traditional fee-for-service Medicare even three years ago.

We're going to walk through what's actually behind this shift, which cardiac services are getting hit hardest, what it means specifically if you're practicing in Maryland, and what your billing team can realistically do about it starting now.

Why Cardiology Is Under More Billing Scrutiny in 2026

Cardiology has always been expensive to insure. High-cost imaging, frequent follow-up, devices, interventional procedures. That's exactly the kind of specialty payers look at first when they're trying to control spending, so in some sense none of this is new. What's different in 2026 is how many pressures are hitting at once.

Start with the imaging itself. CCTA, nuclear stress testing, and cardiac MRI all reimburse well compared to a standard office visit, and cardiology patients often need repeat studies as their condition changes. That's a pretty obvious target for a utilization management program, and payers have been building toward it for a while.

Then there's the AI piece, which is the part actually making headlines. Commercial payers and Medicare Advantage plans have used algorithmic review for years now, quietly, in the background. What's new is that this same approach just reached into traditional Medicare through the WISeR model. WISeR doesn't touch core cardiac imaging codes yet, to be clear, but cardiology groups are watching it closely because the underlying structure could expand.

The numbers back up what practices are feeling. A 2026 denial management analysis covering 240 specialty practices found that prior authorization denials now make up 34 percent of all first-pass claim denials, up from 22 percent back in 2023. That's a big jump for three years, and cardiology absorbs more than its share because so much of what the specialty bills touches imaging or device-related authorization in some way.

And this isn't just a billing-office complaint. Physicians are saying the same thing. In the American Medical Association's Prior Authorization Survey, 94 percent of physicians said PA requirements delay patient access to care, and 31 percent said their requests are often or always denied outright. For cardiology, where a delayed workup can mean a delayed intervention, that's not just paperwork friction. It's a patient care issue with a billing department attached to it.

The WISeR Model and What It Actually Means for Cardiology

CMS launched the Wasteful and Inappropriate Service Reduction Model, better known as WISeR, on January 1, 2026. There's a fair amount of confusion floating around about what it covers, so let's clear that up.

It's a six-year pilot running through 2031, and it's limited to six states: New Jersey, Ohio, Oklahoma, Texas, Arizona, and Washington. It only applies to traditional Medicare, not Medicare Advantage. Under the model, private technology vendors use AI along with human clinical review to check whether certain outpatient services meet Medicare's existing coverage rules. Providers can either request prior authorization before the service or skip that step and go through a post-service prepayment review instead.

Here's the part cardiology practices actually need to know. The current WISeR service list leans heavily toward pain management, orthopedics, and neurology. Think epidural steroid injections, cervical fusion, vertebral augmentation, arthroscopic knee work, and several nerve stimulator implants. Hypoglossal nerve stimulation for sleep apnea is on there too, which touches cardiology-adjacent territory, but it's really an ENT and sleep medicine procedure, not core cardiac care. Deep brain stimulation, for what it's worth, was actually pulled from the initial rollout by CMS.

So why are the American Society of Echocardiography, the American Society of Nuclear Cardiology, and the Society for Cardiovascular Angiography and Interventions all speaking out against it? Mostly because of how the vendors get paid. Model participants earn a share of whatever expenditures they help avoid, not a flat fee. Those cardiology groups have said that structure creates an obvious incentive to deny claims, and they're worried advanced cardiac imaging could end up on the list once the model expands.

That concern carried enough weight that in June 2026, the House Appropriations Committee attached an amendment to a federal spending bill that would block funding for WISeR, or anything like it, in traditional Medicare. Whether that survives the rest of the legislative process is still up in the air as of this writing. But it tells you how seriously specialty medicine is taking this.

If your practice is outside those six pilot states, don't tune this out. It's a preview. The documentation habits that would hold up under this kind of AI-assisted review are worth building now, before it reaches your payer mix.

Which Cardiac Services Are Facing the Most Prior Authorization Pressure

WISeR itself isn't what's driving cardiology denials today. Commercial payers and Medicare Advantage plans are. Here's where the real pressure sits right now.

Coronary CT angiography is seeing denial rates of 12 to 18 percent on first submission across commercial plans. Payers have rewritten their coverage policies to demand explicit pre-test probability documentation and evidence of prior workup, and a lot of that new leverage comes from the 2024 chest pain guideline updates, which gave payers a fresh clinical framework to lean on.

Nuclear stress testing and stress echo are seeing similar treatment. Payers want to see documented symptoms, risk factors, and proof that a lower-cost option was considered first.

Elective PCI authorization has expanded noticeably on Medicare Advantage plans, and the denial rates there track close to what imaging is seeing.

Cardiac MRI deserves its own mention. KFF's analysis of Medicare Advantage prior authorization data put the overall imaging denial rate at roughly 4.94 percent, but advanced studies like cardiac MRI and PET run meaningfully above that average.

Device monitoring denials tend to come from a different problem entirely: frequency window violations, meaning the claim went in before the 30- or 90-day interval a payer allows.

And echocardiography, particularly repeat studies billed under 93306, gets denied constantly when the note doesn't spell out what actually changed clinically since the last echo.

Put it all together and prior authorization denials in cardiology have nearly doubled since 2023, mostly because Medicare Advantage plans keep expanding their pre-authorization lists for advanced imaging and elective intervention.

The Role of Radiology Benefit Managers in Cardiac Imaging

Here's something that catches a lot of practices off guard: your imaging prior authorization often isn't reviewed by the insurance company at all. It goes through a radiology benefit manager instead, most commonly EviCore by Evernorth or Carelon, formerly known as AIM Specialty Health.

That matters for your day-to-day workflow because each of these vendors runs its own portal, its own clinical criteria, and its own appeal process, all layered on top of whatever the payer itself requires. EviCore, for instance, handles cardiovascular prior authorization for Cigna, including Cigna's Medicare Advantage plans under the HealthSpring rebrand that took effect January 1, 2026. So it's not enough to know Cigna's policy. You need to know EviCore's criteria for that exact study too.

And the rules genuinely aren't consistent from carrier to carrier. One payer might require prior auth for a transesophageal echo while another doesn't ask for it at all. One might only require pre-approval for cardiac MRI under specific clinical circumstances, while another wants it every time. Billing staff end up juggling dozens of carrier-specific rules that shift every quarter, often without any single place to check them all.

What's Different for Maryland Cardiology Practices

Maryland has its own set of wrinkles here, some of which actually help providers, and one that adds a new thing to track.

Start with the state's payment structure, which is unlike anywhere else in the country. Maryland has run a global budget model for hospitals for decades, overseen by the Health Services Cost Review Commission and now folded into the Total Cost of Care Model. Hospitals here aren't paid on a straight fee-for-service basis the way they are almost everywhere else, which changes how cardiac procedures done in a hospital setting get reimbursed compared to services billed out of a physician office.

Then there's the newer piece: Maryland now requires insurers to disclose when AI is being used in coverage decisions, and it explicitly bars AI tools from denying, modifying, or delaying care without real human oversight. For a Maryland cardiology practice fighting an imaging denial that looks like it was generated by an algorithm with no clinical judgment behind it, this gives you an actual regulatory argument to point to, not just a general complaint.

Gold carding is on the horizon but isn't law yet. Maryland has directed its Insurance Administration to study whether a gold card program makes sense, the kind that would exempt high-performing providers from needing prior authorization at all for certain services. Nothing is official right now, but it's worth keeping clean approval records regardless, since eligibility for a future program could easily be based on past performance.

And one more thing that applies statewide and nationally: under the CMS Interoperability and Prior Authorization Final Rule, insurers now have to issue standard determinations within seven calendar days and expedited ones within 72 hours, starting in 2026. That applies to Medicare Advantage and Medicaid plans, including in Maryland, and it should shave real time off the waiting period practices have been dealing with.

Common Documentation Mistakes Driving Cardiology Denials

Most cardiology prior authorization denials aren't happening because the service was actually inappropriate. They're happening because the documentation didn't translate the clinical picture into the exact language the payer's criteria are looking for. A few patterns show up again and again.

Missing pre-test probability reasoning is a big one. Payers increasingly want the clinical thought process behind ordering CCTA or stress testing written out, not just implied by the diagnosis code.

Repeat imaging without a documented reason. If a patient is getting a second echo or stress test, the note needs to say plainly what's changed since the last one. Leave that out and the payer treats it as a duplicate.

Incomplete echo documentation. CPT 93306 has specific required elements, and missing even one tends to trigger an automatic edit.

ICD-10 codes that aren't specific enough. Cardiology has some of the most granular sub-classifications of any specialty, and the gap between a general atherosclerotic heart disease code and one that specifies unstable angina can literally be the difference between getting paid and getting denied.

Frequency violations on device monitoring. Submit before the 30- or 90-day window a payer allows, and it's a near-automatic denial, even when the monitoring itself was completely appropriate.

Treating an authorization as a guarantee. An affirmed prior auth confirms medical necessity was met at the time of review, nothing more. It doesn't protect a claim with sloppy coding, and payers can still audit and take money back later.

Actionable Steps to Reduce Prior Authorization Denials

The cardiology practices handling this well aren't doing anything exotic. They're just consistent about a few things.

They keep a payer-specific authorization matrix that front desk and scheduling staff can check before an order even goes out, not after the study's already done. They've standardized their dictation templates so physicians are prompted to document pre-test probability, symptom history, and prior workup on every imaging order, which is honestly the single highest-return fix available to most practices. They track denials by CPT code and by payer, so a recurring problem, like one plan consistently denying stress echo, gets caught early instead of becoming a slow revenue leak.

They also make sure the person handling authorization actually understands the clinical side, not just the paperwork side. Someone who knows what a reduced LVEF or an abnormal stress test result actually means clinically writes a far more convincing authorization request or appeal than someone working from a checklist alone.

Appeals matter too, and specificity matters most. A generic appeal letter gets a generic denial upheld. An appeal that cites the exact clinical finding matching the payer's own published criteria has a much better shot at getting overturned. And it's worth watching radiology benefit manager updates separately from payer policy updates, since EviCore and Carelon can change their criteria independently of whatever the underlying insurer is doing.

Expert Recommendations for Cardiology Billing Teams

Given where denial patterns and policy are headed, a few priorities stand out for the rest of 2026.

Treat prior authorization as a clinical documentation problem, not just a billing one. The practices getting the best results are the ones where physicians and billing staff build documentation standards together up front, instead of billing staff scrambling to reconstruct medical necessity after a denial has already landed.

Keep an eye on WISeR even if your state isn't part of the pilot. CMS has a track record of expanding these models over time, and cardiology's advanced imaging and interventional volume make it a fairly obvious next candidate.

If you're in Maryland, document any denial that looks like it came without real human clinical review. The state's AI transparency rule gives you specific leverage to challenge those.

And honestly, take a hard look at whether your current billing setup can actually keep up with carrier-specific and RBM-specific rules that shift every quarter. That's exactly the kind of moving target that benefits from a team that specializes in cardiology, rather than a general medical billing operation trying to cover every specialty at once.

Frequently Asked Questions

1. What is the WISeR model and does it apply to Maryland?

WISeR is a CMS pilot that adds AI-assisted prior authorization to traditional Medicare for select services. It's currently running in six states, New Jersey, Ohio, Oklahoma, Texas, Arizona, and Washington, and Maryland isn't one of them. Maryland practices should still pay attention, since the model could expand or influence how Medicare Advantage and commercial payers behave down the road.

1. Does WISeR currently require prior authorization for cardiac imaging?

Not directly. The current list is mostly pain management, orthopedic, and nerve stimulation procedures, plus hypoglossal nerve stimulation for sleep apnea. Core cardiac imaging, echocardiograms, nuclear stress tests, CCTA, isn't on there yet, though cardiology groups are worried it eventually could be.

1. Why are cardiology claim denials increasing in 2026?

A mix of things: expanded prior authorization requirements from Medicare Advantage plans, more AI-assisted claims review from commercial payers, updated clinical guidelines that give payers new grounds to deny against, and, honestly, documentation gaps on the practice side that make it easy for a payer to say no.

1. Which cardiac imaging studies are most likely to be denied?

Coronary CT angiography, nuclear stress testing, stress echocardiography, and cardiac MRI are currently seeing the highest first-submission denial rates, generally somewhere between 12 and 18 percent on commercial plans.

1. What is a radiology benefit manager and why does it matter for cardiology billing?

It's a third-party company, like EviCore by Evernorth or Carelon, that many payers use to review imaging and cardiovascular procedure requests instead of doing it in-house. Practices need to track both the payer's policy and the RBM's separate clinical criteria, since the two don't always line up.

1. How has Maryland's prior authorization law changed in 2026?

Insurers now have to disclose when AI is used in coverage decisions, and the state prohibits AI tools from denying or delaying care without meaningful human oversight. Maryland is also studying a gold card program that would exempt high-performing providers from prior authorization for certain services.

1. What is gold carding, and is it available in Maryland yet?

Gold carding exempts providers with a strong prior authorization track record from needing authorization at all for certain services. Maryland hasn't passed a gold card law as of 2026, but the state Insurance Administration has been directed to study whether one makes sense.

1. How long do payers have to respond to a prior authorization request in 2026?

Under the CMS Interoperability and Prior Authorization Final Rule, Medicare Advantage and Medicaid plans have to respond within seven calendar days for standard requests and 72 hours for expedited ones. That's a real improvement from the old standard, which allowed up to 14 days.

1. What documentation actually reduces the risk of a cardiac imaging denial?

Clear pre-test probability reasoning, documented symptoms and risk factors, and for repeat studies, a plain statement of what's changed clinically since the last one. These are exactly the details payers are checking against.

1. Should a cardiology practice outsource prior authorization management?

It really depends on your volume and how much clinical fluency your current staff has. But a lot of practices find that cardiology-specific prior auth needs enough specialized knowledge and payer tracking that a dedicated revenue cycle partner ends up reducing denials and freeing up staff for patient-facing work.

Conclusion

Cardiology billing in 2026 sits right at the intersection of expensive imaging, tangled prior authorization workflows, and a regulatory landscape that's still moving, from the federal WISeR pilot to Maryland's new AI transparency rules. None of that means cardiac imaging and procedures are becoming impossible to get approved. It means the documentation habits that used to be nice-to-haves are now what stands between a clean claim and a costly denial.