Don’t forget to distinguish between the primary procedure code and add-on codes.
Knowing how to structure your claim when reporting an atrial fibrillation (AFib) ablation is crucial to successful payment.
Try your hand at this scenario and keep the suggested tips in mind for the next time you need to report an AFib ablation:
Scenario: A 67-year-old patient with symptomatic persistent atrial fibrillation despite antiarrhythmic drug therapy presents for catheter ablation. Prior electrocardiograms (ECGs) and Holter monitoring confirm continuous AFib lasting longer than seven days.
Procedure performed: The cardiologist performs a comprehensive electrophysiologic evaluation. Pulmonary vein isolation (PVI) is completed using radiofrequency ablation to electrically isolate all four pulmonary veins.
After successful PVI, the patient remains in atrial fibrillation. Mapping identifies additional arrhythmogenic activity along the posterior left atrial wall. Due to persistent AFib after PVI, the physician performs additional targeted ablation of atrial tissue outside the pulmonary veins to achieve rhythm control. The patient converts to sinus rhythm by the end of the procedure.
Documentation highlights: Here is what you should’ve noticed in the documentation:
- AFib type clearly documented as persistent
- Pulmonary vein isolation fully described
- Additional ablation performed beyond PVI with medical necessity explained
- Distinct atrial tissue sites identified and treated
- Successful outcome documented
Solution: Here’s what you should report:
- ICD-10-CM diagnosis code: I48.19 (Other persistent atrial fibrillation)
- CPT® codes:
- 93656 (Comprehensive electrophysiologic evaluation with transseptal catheterizations, insertion and repositioning of multiple electrode catheters, induction or attempted induction of an arrhythmia including left or right atrial pacing/recording, and intracardiac catheter ablation of atrial fibrillation by pulmonary vein isolation, including intracardiac electrophysiologic 3-dimensional mapping, intracardiac echocardiography with imaging supervision and interpretation, right ventricular pacing/recording, and His bundle recording, when performed)
- +93657 (Additional linear or focal intracardiac catheter ablation of the left or right atrium for treatment of atrial fibrillation remaining after completion of pulmonary vein isolation (List separately in addition to code for primary procedure))
Coding tips: Remember, +93657 is an add-on code and you should only report it when the operative note clearly documents medically necessary ablation beyond pulmonary vein isolation. Also, the documentation must explain why additional ablation was required (for example, atrial fibrillation persisted after PVI).
Note These Other Related Codes
If your atrial fibrillation ablation case includes an electrophysiology (EP) study or mapping, you could potentially also report one of the following codes:
- 93653 (Comprehensive electrophysiologic evaluation with insertion and repositioning of multiple electrode catheters, induction or attempted induction of an arrhythmia with right atrial pacing and recording and catheter ablation of arrhythmogenic focus, including intracardiac electrophysiologic 3-dimensional mapping, right ventricular pacing and recording, left atrial pacing and recording from coronary sinus or left atrium, and His bundle recording, when performed; with treatment of supraventricular tachycardia by ablation of fast or slow atrioventricular pathway, accessory atrioventricular connection, cavo-tricuspid isthmus or other single atrial focus or source of atrial re-entry)
- 93654 (Comprehensive electrophysiologic evaluation with insertion and repositioning of multiple electrode catheters, induction or attempted induction of an arrhythmia with right atrial pacing and recording and catheter ablation of arrhythmogenic focus, including intracardiac electrophysiologic 3-dimensional mapping, right ventricular pacing and recording, left atrial pacing and recording from coronary sinus or left atrium, and His bundle recording, when performed; with treatment of ventricular tachycardia or focus of ventricular ectopy including left ventricular pacing and recording, when performed)
Intra-procedural study codes, like the following, are typically bundled and not separately billable when included in the primary ablation service:
- +93621 (Comprehensive electrophysiologic evaluation including insertion and repositioning of multiple electrode catheters with induction or attempted induction of arrhythmia; with left atrial pacing and recording from coronary sinus or left atrium (List separately in addition to code for primary procedure))
- +93622 (Comprehensive electrophysiologic evaluation including insertion and repositioning of multiple electrode catheters with induction or attempted induction of arrhythmia; with left ventricular pacing and recording (List separately in addition to code for primary procedure))
- +93623 (Programmed stimulation and pacing after intravenous drug infusion (List separately in addition to code for primary procedure))
Prior Authorization: A Critical Step
Many payers, especially Medicare Advantage and commercial plans, require prior authorization (PA) for atrial fibrillation ablation before the procedure date.
If you’re assisting in the PA packet, you should submit robust information including:
- Arrhythmia documentation (ECG, monitor reports)
- Symptom history and antiarrhythmic medication trials
- Physician notes detailing clinical rationale
- Failed conservative therapy documentation
- Previous ablation history (if applicable)
Incomplete PAs are one of the most common causes of claim denial or “lack of medical necessity” decisions.
Rules can change frequently. Verify each payer’s criteria for atrial fibrillation ablation PA before scheduling. Lack of PA may lead to claim rejection or significant write-offs.
Avoid AFib Ablation Documentation Pitfalls
Accurate, comprehensive documentation is the backbone of a clean claim.
In the pre-procedure documentation, you should include all the following:
- Detailed arrhythmia diagnosis (type and duration)
- Symptom severity and frequency
- Noninvasive testing (ECG, Holter monitor reports)
- Medication history and failed therapy rationale
For the intra-procedure documentation, like surgical/procedural notes, include the following:
- Description of catheters placed and sites ablated
- Mapping details (if used)
- Any complications or additional interventions
- Add-on ablations clearly documented with justification
After the procedure, your provider must document outcomes, any immediate follow-ups, and complications or lack thereof.
Accurate documentation not only supports coding choices but also protects against denials, appeals, and audits.
Final Step: Preparing and Submitting Claims
Once your coding and the physician’s documentation are aligned, claim preparation begins. Follow this checklist to make sure your claim has the best chance of approval.
Ensure the claim includes:
- Primary ICD-10-CM code that justifies the ablation
- Primary CPT® procedure code 93656
- Any appropriate add-on CPT® codes (if applicable and documented)
- Place of service and provider identifiers
Submit claims electronically through your practice management or clearinghouse platform, following payer guidelines. Ensure:
- Correct provider and facility national provider identifiers (NPIs)
- Accurate dates of service
- Charges consistent with relative value unit (RVU) valuation and cost documentation
- Units correctly listed
Takeaway
By understanding documentation requirements, correct coding (ICD-10-CM and CPT®), payer expectations, and proper claim preparation, you’ll reduce denials and maximize appropriate reimbursement for these EP ablation procedures. Keeping a proactive workflow and knowledge of updates ensures your practice remains compliant and financially sound.
Suzanne Burmeister, BA, MPhil, Medical Writer and Editor
