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Mike Chen is the billing manager for a 12-provider cardiology group in Ohio. Every Monday, he pulls the aging report. And every Monday, the same names show up in the 90-day column: UnitedHealthcare cath lab claims, Medicare stress echo denials, a stack of patient balances nobody has called on. The total? $184,000 sitting in AR limbo.
Here's the part that keeps him up at night: his team is working hard. Claims go out clean. Denials get appealed. But the money isn't moving. Cardiology claims are different—higher dollar values, more complex coding, stricter prior auth rules, and payers who seem to find new reasons to delay payment every quarter.
In 2026, the problem got worse. The CPT update introduced 418 changes affecting cardiovascular procedures. Payers expanded prior authorization requirements for diagnostic caths and cardiac MRIs. And MGMA data shows cardiology denial rates now run 8–15%, well above the 5% benchmark that defines a healthy revenue cycle. For a practice generating $5M annually, that's $400,000 to $750,000 in leaked revenue.
This article isn't theory. It's a practical framework for cardiology practices that need to recover aged AR, fix denial patterns, and build a revenue cycle that actually collects what you've earned.
What Is Cardiology AR Recovery?
Accounts Receivable (AR) recovery in cardiology is the systematic process of investigating, correcting, appealing, and collecting payment on outstanding claims that have aged beyond normal payment cycles.
In cardiology, 'normal' is shorter than you think. Most commercial payers process clean claims within 14–30 days. Medicare typically pays within 14–21 days. When a claim hits 60 days without payment, something is wrong. At 90 days, the probability of full collection drops sharply. At 120 days, you're often writing off money that could have been recovered.
Cardiology AR recovery covers four distinct categories:
- Payer AR — Claims submitted to insurance but unpaid, denied, or underpaid
- Patient AR — Deductibles, copays, and coinsurance that patients haven't paid
- Denied Claims — Claims rejected for coding, documentation, eligibility, or authorization issues
- Underpayments — Claims paid at rates below contracted or expected reimbursement
Why Cardiology AR Ages: The Real Causes
Cardiology claims don't age for one reason. They age for many. Here's what we see most often:
| AR Problem | Common Cause | Revenue Impact | Recommended Action |
|---|---|---|---|
| Eligibility Failures | Patient coverage lapsed or incorrect payer on file | High — entire claim denied | Real-time eligibility verification before every visit |
| Prior Auth Gaps | Cath lab, cardiac MRI, stress tests require auth | Very High — claim rejected outright | Auth workflow tied to scheduling |
| Coding Errors | Missing modifiers, wrong CPT/ICD-10 pairing | Medium — partial or full denial | Cardiology-certified coder review |
| Documentation Gaps | Insufficient medical necessity support | High — Medicare/commercial denial | Template-driven clinical documentation |
| Timely Filing Misses | Claim submitted past payer deadline (90–180 days) | Total loss — unrecoverable | Automated filing deadline tracking |
| Claim Edits | Payer-specific edits flagging bundling or frequency | Medium — payment delayed or reduced | Pre-submission scrubbing against payer rules |
| Underpayments | Payer pays below contracted rate | Medium — revenue leakage | Contractual rate monitoring + appeal |
| COB Issues | Coordination of benefits not resolved | High — secondary payer won't pay | Primary/secondary verification at intake |
Why Cardiology AR Requires Specialized Knowledge
A generalist biller can handle a sinus infection visit. Cardiology? Not so much. The specialty's complexity creates AR problems that generic billing teams simply don't recognize.
Diagnostic testing alone creates layers of confusion. Echocardiography (93306, 93350), stress testing (93015–93018), and cardiac catheterization (93458, 93461) each carry specific documentation requirements, modifier rules, and payer-specific edits. A missing -26 or -TC modifier can split a $2,500 claim into a $0 payment and a denial.
Then there's the professional vs. facility billing split. Hospital-based cardiologists bill professional components. The facility bills technical components. When the two systems don't reconcile, AR ages on both sides with nobody owning the follow-up.
Prior authorization is the biggest landmine. In 2026, most major payers require prior auth for diagnostic cardiac catheterization, cardiac MRI (75557–75565), and coronary CT angiography (75574). Miss the auth, and the claim dies—no appeal, no recovery. The denial isn't even coded as 'denied.' It's coded as 'not authorized,' which many billing systems don't flag properly.
Medical necessity disputes are rising. Payers increasingly demand specific clinical indicators for stress tests and imaging. A generic 'chest pain' diagnosis won't cut it. You need documented symptoms, risk factors, and sometimes failed conservative treatment. When documentation is thin, the claim gets downcoded or denied—and the AR sits.
The Aging Bucket Strategy: How to Prioritize AR by Age
Not all aged AR deserves the same attention. Here's how cardiology practices should allocate follow-up resources:
| AR Age | Priority | Primary Goal | Typical Action |
|---|---|---|---|
| 0–30 days | Monitor | Prevent aging | Verify claim acceptance via clearinghouse; check for front-end rejections |
| 31–60 days | Active | Identify delays | Check payer portal status; resolve 'pended' or 'review' holds |
| 61–90 days | High | Resolve barriers | Investigate denials; correct coding/doc issues; submit appeals |
| 91–120 days | Critical | Protect collectability | Escalated follow-up; supervisor-level payer contact; legal review if needed |
| 120+ days | Urgent | Recover or close | Final appeal attempts; patient balance transfer; write-off analysis |
Note: These buckets are a framework, not universal law. A $15,000 cath lab claim at 45 days deserves more urgency than a $120 EKG follow-up at 75 days. Dollar value and timely-filing risk should always override simple age-based sorting.
The Cardiology Aged-AR Recovery Workflow
AR recovery isn't random phone calls. It's a repeatable process:
- ▶ 1. Segment the AR: Sort by payer, dollar value, age, and denial reason. A $12,000 cath lab denial gets priority over a $200 follow-up visit.
- ▶ 2. Identify Root Cause: Is it coding? Documentation? Auth? Eligibility? COB? Don't resubmit until you know why it failed.
- ▶ 3. Verify Claim & Payer Status: Check the payer portal. Is the claim in review? Pended? Missing info? Sometimes the claim is fine—the payer is just slow.
- ▶ 4. Correct Billing or Documentation: Fix coding errors. Add missing modifiers. Supplement documentation. Get the auth retroactively if the payer allows.
- ▶ 5. Submit Corrected Claim or Appeal: Follow payer-specific corrected claim rules. Some want a new claim. Some want an appeal letter. Some want both.
- ▶ 6. Follow Up Systematically: Set follow-up dates. Track every call. Document payer representative names and reference numbers. AR that isn't tracked doesn't get worked.
- ▶ 7. Reconcile Payment: When payment arrives, verify it's the correct amount. Underpayments are still AR—just hidden better.
- ▶ 8. Track the Outcome: Did the appeal succeed? Was the underpayment corrected? Feed this data back to prevent the same problem next month.
AR Prioritization Matrix: Where to Focus First
Billing managers have limited hours. This matrix helps allocate them wisely:
| Account Type | Priority Level | Why It Matters |
|---|---|---|
| High dollar + near timely-filing deadline | URGENT | Once the deadline passes, the money is gone permanently |
| High dollar + denied | HIGH | Large revenue at risk; appeals take time—start early |
| No payer response after 45 days | HIGH | Silent claims often hide pended or lost status |
| Documentation-dependent denials | MEDIUM-HIGH | Requires clinical staff involvement; schedule quickly |
| Contractual underpayment | MEDIUM | Systematic revenue leakage; aggregate and appeal in batches |
| Low dollar + easy correction | MEDIUM | Quick wins build team momentum and cash flow |
| Secondary claim issue | MEDIUM | Primary paid but secondary won't process; often a COB fix |
| Patient balance (>$500) | LOW-MEDIUM | Patient collections require different tactics than payer follow-up |
Denial Recovery: Fix It Once, Prevent It Forever
There's a difference between fixing a denial and preventing it. Most practices only do the first part. They correct the claim, resubmit, and move on. Then the same denial shows up next month.
Root-cause analysis is what separates practices that recover AR from practices that just tread water. When a cardiology claim denies for 'missing modifier,' the fix isn't adding the modifier. The fix is understanding why the modifier was missing—coder training, EHR template gaps, or front-end verification failures—and closing that gap.
| ✓ Do This | ✗ Avoid This |
|---|---|
| Categorize denials by root cause (coding, auth, eligibility, documentation) | Resubmit claims without investigating why they denied |
| Track denial trends by payer and procedure type | Treat every denial as an isolated incident |
| Appeal with supporting documentation and clinical rationale | Appeal with generic 'please reconsider' letters |
| Feed denial patterns back to front-end and coding teams | Keep AR and front-end teams in separate silos |
| Set follow-up dates for every appeal | Submit appeals and hope the payer responds |
Technology vs. Human Judgment: The Right Balance
AR recovery isn't a technology problem or a people problem. It's both. Here's how the approaches compare:
| Approach | Strength | Limitation |
|---|---|---|
| Manual-only | Human judgment catches nuance | Time-intensive; can't scale past ~500 claims/month |
| Automation-only | Fast processing; 24/7 monitoring | Misses payer-specific quirks; can't negotiate appeals |
| Human + Technology | Scalable + contextual; best of both | Requires proper workflow design and training |
Technology should handle the repetitive work: claim-status tracking, work-queue routing, deadline alerts, and payment reconciliation. Humans should handle the complex work: appeal strategy, payer negotiation, documentation review, and root-cause analysis. At Sirius Solutions Global, our AI tools flag at-risk claims before they age. Our certified cardiology coders handle the appeals that machines can't win.
Cardiology AR Health Check: KPIs That Matter
You can't fix what you don't measure. Track these metrics monthly:
- AR Days — Target: under 35 days for cardiology practices
- Aging by Bucket — What % sits past 60, 90, 120 days?
- Denial Rate — Total denials / total claims submitted
- Clean Claim Rate — Claims accepted on first submission
- First-Pass Resolution — Claims paid without appeal
- Outstanding High-Dollar Claims — Accounts >$5,000 past 60 days
- Appeal Success Rate — Appeals overturned / total appeals filed
- Underpayment Recovery — Dollars recovered from underpaid claims
- Patient AR as % of Total AR — Should typically be <20%
- Payer-Specific AR Trends — Which payer is your biggest problem?
Don't chase benchmarks blindly. A practice with 80% Medicare will have different AR patterns than one with 60% commercial payers. Compare your trends to your own history, not generic industry averages.
30-Day Cardiology AR Recovery Action Plan
A practical week-by-week roadmap:
- ▶ Week 1: AR Inventory + Segmentation: Pull your aging report. Sort every account by payer, dollar value, age, and denial reason. Flag anything over $5,000 or within 30 days of timely-filing deadlines. This is your hit list.
- ▶ Week 2: Root-Cause Analysis + Payer Prioritization: For every flagged account, determine why it's unpaid. Is it a coding error? Missing auth? Payer delay? Categorize denials and identify your top 3 recurring problems.
- ▶ Week 3: Corrections + Appeals + Follow-Up: Fix what you can fix. Submit corrected claims. File appeals with supporting documentation. Make payer phone calls for high-dollar accounts. Document every interaction.
- ▶ Week 4: Trend Analysis + Prevention Improvements: What patterns emerged? Are the same denials repeating? Are certain payers consistently slow? Feed these insights back to your front-end team, coding staff, and scheduling workflow.
Is Your Cardiology AR Recovery Process Working?
Answer honestly. The more 'no' responses, the more opportunity you have:
- ☐ Are aged claims segmented by payer and dollar value?
- ☐ Are high-value claims reviewed before timely-filing risk increases?
- ☐ Are denials categorized by root cause?
- ☐ Are underpayments identified systematically?
- ☐ Is payer follow-up tracked consistently?
- ☐ Are recurring denial patterns communicated back to front-end and coding teams?
- ☐ Do you have a written AR recovery workflow?
If you answered 'no' to three or more, your AR workflow has meaningful gaps that are likely costing revenue.
Frequently Asked Questions
The Bottom Line
Aged AR in cardiology isn't a billing problem. It's a systems problem. Eligibility gaps at intake become denials at 30 days. Missing modifiers become write-offs at 120 days. Underpayments that nobody notices become permanent revenue leakage.
The practices that recover the most money don't work harder—they work smarter. They segment AR by value and risk. They fix root causes instead of symptoms. They use technology for speed and humans for judgment. And they measure what matters.
If your cardiology practice is sitting on aged AR that keeps growing, the first step is a clear-eyed assessment. Where is the money stuck? Why is it stuck? And what's your plan to get it unstuck?
At Sirius Solutions Global, we help cardiology practices answer those questions—and recover revenue they thought was lost.