Denial Management for Cardiologists

Deleted codes in charge templates will trigger quiet denials until practices notice them.

Altair Health 9 September 2026

The 2026 CPT code set deleted six percutaneous coronary intervention add-on codes that cardiology practices had been billing for years. A charge template still carrying 92921, 92925, 92929, 92934, 92938 or 92944 will generate denials on every claim that touches them, and it will do so quietly, one claim at a time, until somebody reads a remittance closely enough to notice.

That is the shape of most cardiology denials. Not a payer disputing the medicine, but a code pairing, a modifier, or a date that stopped being billable while the practice kept billing it.

Six failure points account for most of it in 2026. Each one closes before the claim leaves the practice.

The 2026 CPT deletions, and the charge templates still carrying them

The American College of Cardiology's coding guidance for 2026 confirms the deletions: the branch-vessel add-on codes are gone, and the work they described is now folded into the revised primary codes, which read "single major coronary artery and/or its branch(es)". One code now covers what two used to.

The practices that will feel this are the ones whose charge capture runs off a template nobody revisits in January. The codes were valid in December and are not valid now, and a claim carrying a deleted code does not come back with a note explaining why. It comes back as a denial that looks like every other denial.

Two related descriptor revisions landed in the same update, on 92973 and 93571, alongside a new plaque-assessment code, 75577. Any of the three can produce a rejection if the template predates them.

The bundling edits that catch cardiology most often

Cardiology bills a high density of diagnostic and interventional code pairs on the same date of service, which is what puts it in front of National Correct Coding Initiative edits more often than most specialties. Three pairs account for a large share of the avoidable denials.

Echocardiography is the first. The descriptor for 93306 already includes spectral and color flow Doppler. The add-on codes 93320 and 93325 are reportable with 93307 and 93308, which do not include Doppler, and reporting them alongside 93306 duplicates work the primary code already covers. The edit fires automatically.

Cardiac CT is the second. CPT's own parenthetical instruction bars calcium scoring, 75571, on the same date as coronary CT angiography, 75572 through 75574, because the scoring is included. NCCI enforces it.

The third is coronary angiography performed alongside PCI on the same vessel in the same session, which is not separately billable unless the documentation supports a distinct diagnostic service and the claim carries the modifier that says so.

CMS updates the procedure-to-procedure and medically unlikely edit files quarterly, effective on the first of January, April, July and October. A pairing that cleared in one quarter can trip an edit in the next, and most practices have nothing checking their charge templates against those release dates. Our claims scrubbing guide covers what a complete pre-submission check includes.

Global periods on device implants, and the visits that fall inside them

Pacemaker and defibrillator implant codes, 33206 through 33208 and 33249, carry 90-day global periods under the Medicare Physician Fee Schedule. Bill a post-operative visit inside that window without a modifier establishing that it was unrelated and the payer denies it. Worse, a payer that pays it can recoup it later.

Ninety days is long enough that the visit rarely looks connected to the implant by the time it happens. That is the whole problem. Whoever writes the claim is looking at today's encounter, not at a procedure from eleven weeks ago.

The coronary vessel modifiers, which are not new and are still missed

LM, LD, LC, RC and RI identify which coronary artery an intervention treated. Medicare has required them on PCI claims for years, and its billing and coding article for percutaneous coronary interventions sets out the documentation each one needs.

Nothing changed here in 2026. They appear on this list because they are among the most common avoidable denials in cardiology, and because the documentation requirement is easy to satisfy at the time of the procedure and close to impossible to reconstruct four months later during an appeal.

Prior authorization, and what the Medicare Advantage numbers actually say

Medicare Advantage insurers made 52.8 million prior authorization determinations in 2024 and denied 4.1 million of them, or 7.7%, up from 6.4% in 2023, according to KFF. KFF is explicit that these are service determinations rather than payment decisions on care already given, so they describe what gets approved before it happens, not what gets paid afterward.

The spread between insurers is the part that matters operationally. KFF puts the denial rate at 4.2% for Elevance Health plans and 12.8% for UnitedHealth Group plans, a threefold difference across two payers a cardiology practice is likely to bill in the same week.

Practices appealed 11.5% of those denials, and payers partially or fully overturned 80.7% of the appeals. Four in five challenged denials did not survive the challenge, and nearly nine in ten were never challenged at all.

A large share of cardiology prior authorization runs through eviCore by Evernorth, a Cigna Group business with a dedicated cardiovascular utilization management program covering, by the company's own figures, more than 100 million lives. Cigna announced in 2026 that it is exploring a sale or separation of eviCore, so the ownership may not hold.

One trap accounts for most of the rest. An authorization covers a procedure, a date range and a rendering provider. Change any of the three and the claim fails against an authorization that still exists on paper. Our prior authorization guide covers how the requirements differ by payer.

What CMS-0057-F changes, and which payers it does not touch

The CMS Interoperability and Prior Authorization final rule sets response deadlines that took effect for compliance on 1 January 2026: 72 hours for expedited requests, seven calendar days for standard ones. Payers must also give a specific reason for a denial rather than a bare code. The application programming interface requirements follow on 1 January 2027.

The scope is narrower than the coverage suggests. The rule reaches Medicare Advantage organizations, state Medicaid and CHIP fee-for-service programs, Medicaid and CHIP managed care plans, and qualified health plan issuers on the federally facilitated exchanges. Commercial and employer-sponsored plans are outside it entirely, and the response deadlines specifically exclude the exchange issuers.

For a cardiology practice with a heavy Medicare Advantage book, this is an enforceable timeline that did not exist before. For the commercial half of the same practice, nothing has changed.

Medical necessity, and the documentation that answers it

A medical necessity denial on a cardiac study is rarely a disagreement about whether the study was appropriate. It is a documentation gap. The note did not record what the payer's policy asks for, so the payer read the service as unsupported.

The 2021 chest pain guideline from the American Heart Association and the American College of Cardiology gave payers a framework they now expect to see reflected in the chart: a pre-test probability classification, low, intermediate or high, that matches the study ordered. Medicare Advantage plans apply national and local coverage determinations along with their own criteria, and commercial plans apply their published medical policies, which are a different document under a different name.

This is the category where appeals help least, because an appeal argues from the note that already exists. The work sits at the point of service, in recording the specific clinical indicators that justify the study next to the diagnosis code attached to it.

What running this well actually requires

Every failure above has a fix that sits before the claim leaves the practice. A charge template reconciled against each quarterly edit release and each January code set. Authorizations tracked against the procedure, the date range and the provider being billed. Vessel modifiers captured at the time of the procedure. Post-operative visits checked against an implant date ninety days back. Documentation that answers the payer's stated criteria rather than describing the encounter in general terms.

None of that is difficult. All of it is continuous, and that is what makes it hard for a practice running billing alongside everything else. The knowledge also tends to live in one person: the biller who remembers which payer wants what, and who takes it with them when they leave.

Altair runs eligibility verification, authorization tracking, claim scrubbing against each payer's current policies, denial work and appeals, and keeps what it learns about each payer in the system rather than in a person. Coding stays with the practice's own coders. Altair's in-house billers own the exceptions the automation should not decide. See how Altair runs denial management, and our denial code reference for what each CARC requires.

The cardiology practices that lose the least to denials are not the ones with the best appeal letters. They are the ones whose charge templates were current in January.

The edits that catch cardiology most often

Common questions