Last updated: July 14, 2026
Medicare cut cardiology payments again in 2025, and every denial now costs more than it did last year. That's the throughline for this guide: a 2.83% conversion-factor cut raises the stakes on every coding error, missed authorization, and documentation gap that follows. Get the seven items below right, and your practice protects revenue even as reimbursement shrinks.
Contact Rhythm360 to automate compliant CPT capture and build scalable revenue-cycle workflows for your cardiology practice.
The 2025 cut stems from the statutory update under MACRA, combined with the expiration of a temporary payment bump and a budget-neutrality adjustment tied to prior RVU changes. Before GPCI, modifiers, or sequestration adjustments, this produces a real drop in Medicare payment for cardiology and EP services compared with 2024.
This is the fifth straight year of cuts to the MPFS conversion factor, spanning 2021 through 2025. Practice cost inflation hit 3.5% in 2025 per the Medicare Economic Index. Adjusted for inflation, Medicare physician pay has fallen 33% since 2001, even as practice costs rose 59% over the same period.
The table below shows the size of the gap. The bottom row matters most: practice costs keep climbing while payment keeps falling, which is why every downstream coding and documentation error now carries more financial weight than it used to.
| Metric | 2024 Value | 2025 Value | Impact |
|---|---|---|---|
| MPFS Conversion Factor | $33.29 | $32.3465 | -2.83% reduction |
| Estimated annual payment loss | - | - | Before GPCI/sequestration |
| Medicare physician pay decline since 2001 (inflation-adjusted) | - | -33% | Practice costs +59% same period |
Lower reimbursement makes every bundling mistake more expensive, which is why EP coding precision matters more in 2025. Diagnostic EP study code 93620 is bundled into primary ablation codes 93653, 93654, and 93656 when performed in the same session. Billing it separately is one of the most common EP audit findings and consistently generates CO-97 bundling denials.
Intracardiac echo (93662) and transseptal puncture (93462) are bundled into comprehensive AF ablation code 93656. Billing either separately from the same session produces the same denial pattern.
Remote interrogation duplicates trigger a different denial code, CO-18. This happens when device codes 93294 through 93298 are billed inside the payer's lookback window: 90 days for pacemakers and ICDs, or 30 days for loop recorders. Modifier-22 misuse is another recurring risk. Modifier -22 works for complex EP ablation cases, but only when documentation explicitly quantifies the additional effort, including procedure time and technical complications.
Ablation procedures billed under CPT 93656 need an ICD-10 code for the arrhythmia to support medical necessity. Skip it, and the claim gets denied. Billing an insertion code instead of the correct generator replacement code for lead-intact upgrades is one of the highest-dollar EP coding errors practices make.
The pitfalls below extend the bundling issues just covered. Each one maps to a specific denial code, so your coders can flag the risk before the claim goes out.
| CPT Pitfall | Denial Risk | Prevention |
|---|---|---|
| 93613 billed with 93654 (VT ablation) | CO-97 bundling denial | Confirm NCCI edit status before billing 93613 separately |
| 93620 billed separately from 93653/93654/93656 | CO-97 bundling denial | Never bill diagnostic EP study separately in same session as ablation |
| 93662 or 93462 billed with 93656 | CO-97 unbundling denial | ICE and transseptal puncture are included in 93656 |
| 33249 used for lead-intact generator upgrade | Coding denial | Use appropriate codes for generator-only replacements |
| 93656 without supporting diagnosis code | Medical necessity denial | Document applicable arrhythmia diagnosis |
Bundling discipline protects revenue on the procedural side. RPM documentation protects it on the monitoring side, and the rules are changing. The 2026 CPT update added two codes that directly affect cardiology RPM workflows. CPT 99445 covers device supply and data transmission for 2 to 15 days within a 30-day period, closing the gap left by the old 16-day minimum threshold. CPT 99470 covers RPM treatment management of 10 to 19 minutes, while 99457 and 99458 still apply to sessions of 20 minutes or longer.
Each code has its own documentation requirements, and none of them substitute for one another.
Get patient consent when RPM services are furnished, not after. Only one practitioner may bill remote monitoring for a given patient. Track RPM time separately from CCM, TCM, BHI, and PCM time to avoid double-counting.
RPM documentation errors delay payment on individual claims. Missing prior authorization blocks the procedure entirely, and it's the single largest denial driver in cardiology. Most failures trace back to an authorization number omitted from the claim, one that covers a different procedure or facility, or one that expired before the service date. The problem is widespread: 94% of physicians report that prior authorization delays access to necessary care, according to the AMA's 2024 survey.
A pre-procedure verification workflow for high-cost EP and cardiology services should include:
Cardiology denial rates run 15 to 20%, among the highest in outpatient medicine. Well-managed practices target below 5%. Coding-related and medical necessity denials have been climbing, and four CARC codes account for most of them.
Appeal the ones that slip through. Well-documented appeals succeed 60% of the time or higher. Medicare Advantage plans give you 60 days to file a first-level appeal; commercial payers allow 65 to 180 days depending on the insurer.
Fixing individual denials only goes so far. A structured audit program catches the patterns behind them. Schedule quarterly internal audits and biannual external reviews, benchmarked against a clean claim rate above 95%, a denial rate below 5%, and days in A/R under 40. Auditing quarterly at minimum matters because a documented compliance program reduces audit penalty assessments compared with practices that have no formal program.
A quarterly EP billing audit framework should include:
Practices that pair this audit framework with specialty-trained coders and pre-bill scrubbing see denial rates drop substantially, because the audit catches the same errors before they reach a payer.
Every step above requires accurate, timely documentation. That's the gap Rhythm360 closes. It's a vendor-neutral, cloud-based platform that ingests and normalizes CIED data from Medtronic, Boston Scientific, Abbott, Biotronik, and other manufacturers into one audit-ready workspace. Instead of clinical staff logging into separate OEM portals, Rhythm360 consolidates device transmissions, automates CPT code capture, and generates the documentation the billing workflows above require.
Key platform capabilities include:
Other platforms in this space include Paceart, Murj, PaceMate, Implicity, Rhythm Management Group, and Octagos. Rhythm360 is built specifically to fix the multi-OEM data fragmentation and documentation gaps behind the compliance failures covered in this guide. Practices using it have reported up to a 300% revenue increase through better CPT capture and new RPM service lines for heart failure and hypertension management.
Talk to a Rhythm360 specialist about automating compliant documentation and CPT capture for your CIED and RPM population.
The 2025 MPFS final rule cut the conversion factor by 2.83%, from $33.29 to $32.3465, effective January 1, 2025. It results from the MACRA statutory update, the expiration of a temporary 2.93% payment increase, and a budget-neutrality adjustment. The cut applies to every Medicare-covered cardiology and EP service, including ablations, device interrogations, echocardiography, and remote monitoring.
CPT 93620 bundles into primary ablation codes 93653, 93654, and 93656 in the same session. CPT 93613 bundles into VT ablation code 93654. CPT 93662 and 93462 both bundle into comprehensive AF ablation code 93656, as do temporary pacing wires placed for the procedure. Billing any of these separately from the same session is a top EP audit finding and consistently triggers CO-97 denials.
CPT 99454 requires 16 or more days of automated device data within a 30-day period; patient-reported data doesn't count. CPT 99445, effective January 1, 2026, covers 2 to 15 days within the same window, giving practices a billing path for shorter monitoring periods. The two codes can't be billed together for the same patient in the same 30-day period.
The operative report must confirm that ICE (93662), transseptal puncture (93462), and the diagnostic EP study (93620) were performed in the same session as the ablation and aren't separately reportable. The note needs an ICD-10 arrhythmia code for medical necessity. If modifier -22 applies, document the added procedure time, cardioversion count, and any complications. State clearly that antiarrhythmic therapy failed or was contraindicated, since leaving this out is a top driver of CO-50 denials.
Every compliance gap covered here costs more in 2025 than it did a year ago, because the 2.83% conversion-factor cut compounds the financial impact of every preventable denial. Front-end controls and audit-ready documentation matter more now than in prior years.
Practices that follow the seven-step framework, run quarterly audits against a 95%+ clean-claim rate and sub-5% denial rate, and deploy automated documentation tools protect revenue and reduce OIG audit exposure going forward.
Rhythm360 provides the vendor-neutral infrastructure behind these strategies, from automated CPT capture and multi-OEM data ingestion to bi-directional EHR integration and AI-powered alert triage, inside a HIPAA-compliant, audit-ready platform.
Schedule a demo to see how Rhythm360 builds compliant, scalable cardiac monitoring workflows for your practice.
