Prior authorization for cardiology and vascular surgery, handled end-to-end

Cardiovascular is the single highest prior-authorization burden in outpatient medicine. A mid-sized cardiology group runs 80-150 PAs a week across cath, EP, structural heart, and vascular, and a separate vein-ablation and IR book on top. Most of those PAs are delegated to Carelon (Anthem / Elevance plans), eviCore (much of Aetna, Cigna, Humana MA, and regional Blues), or handled in-house by UnitedHealthcare. This page walks the workflow at the sub-specialty level and shows where AI agents take staff off the portals.

Cardiology: cath, PCI, stress testing, echo

Diagnostic cardiac catheterization (CPT 93454-93461) used to clear automatically under traditional Medicare. In 2026 Medicare Advantage plans and most commercial payers require PA, and the documentation requirements expand if the request is for elective PCI (92920-92944). The payer wants the ischemia evidence (stress, SPECT, or coronary CTA), the angina class, and conservative therapy history. Nuclear stress (78452) and SPECT (78451-78452) are reliable PA triggers with eviCore and Carelon, where the request has to cite pre-test probability and appropriate-use criteria (AUC) from the ACC.

Echocardiography is a lower-intensity PA target: transthoracic echo (93306) clears routinely, but transesophageal (93312-93318) and stress echo (93350) are flagged. The operational pain is volume, not complexity. A busy cardiology office runs 30-50 echo PAs per provider per week and spends most of the effort on portal login and status polling, not on clinical defense.

Electrophysiology: pacemaker, ICD, ablation

EP procedures are implant-heavy, which means every request is a PA request. Pacemakers (33206-33208) and ICDs (33249) require the qualifying rhythm, LVEF (for primary prevention ICDs under NCD 20.4), NYHA class, and documentation that the patient is on guideline-directed medical therapy with the required run-in period. A common denial trigger is missing the 3-month wait after an MI or the 40-day post-revascularization wait for primary-prevention ICDs.

Catheter ablation for atrial fibrillation (93656), SVT (93653), and VT (93654) requires documentation of antiarrhythmic drug failure or intolerance, symptom burden, and for AF specifically, the CHA2DS2-VASc score and anticoagulation history. eviCore and Carelon both publish separate AF ablation criteria that have tightened in 2025-2026. Loop recorder implants (33285) and generator changes (33227-33229) are lighter-lift PAs but high volume.

Structural heart: TAVR, MitraClip, LAAO

Transcatheter aortic valve replacement (33361-33366), MitraClip (33418), and LAA occlusion (33340) all require heart-team documentation: cardiothoracic surgery consult, interventional cardiology consult, STS risk score, frailty assessment, CT angiography, and echo. Payers pull from CMS NCDs (20.32 for TAVR, 20.33 for MitraClip, 20.34 for LAAO) plus their own medical policy. These are long-packet PAs with short review windows, which is exactly the workflow where browser agents that assemble from the EHR beat human coordinators on cycle time.

Vascular surgery and vein ablation

Vascular surgery PA divides cleanly into limb-salvage (open), endovascular (stent/EVAR), and venous work. Endovascular abdominal aortic aneurysm repair (EVAR, 34701-34706) requires aneurysm size, morphology on CT angiogram, and surgeon documentation. Carotid stenting (37215-37218) requires symptomatic vs asymptomatic documentation and the degree of stenosis on imaging. Peripheral vascular interventions (37220-37235) require Rutherford class, ABI values, and documentation of failed conservative therapy.

Vein ablation is the highest-denial procedure in outpatient vascular. Endovenous laser ablation (36478) and radiofrequency ablation (36475) require duplex ultrasound with reflux time over 500 ms in the targeted vein, CEAP classification, 6-12 weeks of failed conservative therapy (compression stockings, leg elevation, analgesics), and documented symptoms beyond cosmetic. The denial is almost always a documentation gap, which is why vein-ablation PA is a high-leverage automation target: the AI pulls the duplex report, the conservative-therapy note, and the symptom documentation and assembles a complete packet before first submission.

Interventional radiology

IR PA covers uterine fibroid embolization (37243), prostatic artery embolization (37243 + 0X code), Y-90 radioembolization (37242 + radiopharmaceutical), and a wide range of tumor embolization and drainage work. Payer policies vary more widely here than in cardio or vascular because IR crosses into oncology, GU, and hepatology. Many IR PAs route through eviCore oncology or the payer's direct medical-policy unit rather than the cardiology delegate.

Payer-specific rules that trip up cardiovascular PA

The single most common operational mistake is submitting to the wrong delegate. A 2026 snapshot of outpatient cardiovascular PA delegation:

See the full payer map at commercial payer PA, BCBS plans, and Medicare, Medicaid, and government payer PA.

Cardiology EHRs, registries, and imaging systems

Most cardiology groups run an ambulatory EHR plus a cardiology-specific charting and registry system. Flexbone reads from whichever combination you have:

• Ambulatory EHRs: athenahealth, NextGen, eClinicalWorks, Allscripts/Veradigm, Greenway Intergy. Details at outpatient EHR PA.
• Cardiology-specific: Lumedx Apollo, Philips IntelliSpace Cardiovascular (ISCV), Pinnacle (GE), Xcelera, MedAxiom. Used for cath lab reporting and imaging archive.
• Registries: NCDR (CathPCI, ICD, AFib Ablation, TVT), Vascular Quality Initiative (VQI), VICTOR. PA packets often pull from registry fields.
• ASC settings: For cardiology ASCs and office-based labs (OBLs), Flexbone works with HST Pathways, SIS Complete, and AmkAI. See the full list at ASC EHRs for prior auth.

How Flexbone handles cardiovascular PA

A Flexbone deployment for a cardiovascular practice maps to three supervised AI workers: a document agent that assembles the clinical packet from the EHR and registry, a browser agent that operates Carelon, eviCore, and payer portals, and a voice agent that handles peer-to-peer scheduling and phone-only payer lines. The work flows through the standard PA workflow: order capture, eligibility check, packet assembly, submission, status polling, determination writeback, and appeal-or-P2P escalation if denied. See also the Flexbone prior authorization automation platform.