Percutaneous Left Atrial Appendage Closure (LAAC) | CMS Coverage Update

Summary: The Centers for Medicare & Medicaid Services modified its coverage policy for percutaneous Left Atrial Appendage Closure (LAAC), effective May 15, 2026. Here's what billing teams need to do.

CMS left atrial appendage closure coverage policy changes aren't common — but when they hit, the financial exposure is real. LAAC is a high-cost structural heart procedure, and any shift in CMS medical necessity criteria directly affects reimbursement for cardiology and electrophysiology practices billing to Medicare. The policy document does not list specific CPT or HCPCS codes in the data available. However, this post covers what your billing team needs to know about the modification, what to watch for, and how to prepare before May 15, 2026.

Quick-Reference Table

CMS Left Atrial Appendage Closure Coverage Criteria and Medical Necessity Requirements 2026

LAAC billing has always lived in a narrow lane. CMS has historically covered percutaneous LAAC — primarily using the Watchman device and its successors — under specific medical necessity conditions tied to atrial fibrillation and contraindications to long-term anticoagulation. This modification signals that CMS is refining those conditions.

The core coverage framework for LAAC under Medicare requires that patients have nonvalvular atrial fibrillation. Patients also need a formal assessment showing elevated stroke risk, typically measured by CHA₂DS₂-VASc score. And critically, there must be documented reasons why long-term anticoagulation therapy is not appropriate for the patient.

This is not a procedure CMS covers broadly. The clinical bar is specific, and your documentation has to match it.

The CMS LAAC coverage policy has long required that procedures be performed by a team with documented experience in transseptal catheterization and structural heart interventions. The facility itself must meet specific volume and credentialing requirements. Both the operator and the facility criteria have historically been part of what separates a covered claim from a claim denial.

Prior authorization requirements for LAAC under Medicare Advantage plans vary by plan — but for traditional Medicare, coverage has historically followed the national coverage determination framework. If this modification expands or restricts any of those criteria, your prior authorization workflows need to reflect the change before the effective date of May 15, 2026.

Because the policy data available does not include the full modified text, your billing team should pull the current policy from the CMS website or your MAC's LCD companion documents. Compare the pre-modification and post-modification criteria line by line. This is not optional — LAAC claims are high-dollar, and a single missing documentation element will generate a claim denial.

If you're uncertain how this modification applies to your patient mix or procedure volume, talk to your compliance officer before May 15, 2026.

CMS Left Atrial Appendage Closure Exclusions and Non-Covered Indications

CMS has consistently excluded certain LAAC scenarios from coverage. These exclusions haven't changed with every revision, but they're worth reviewing against whatever the May 2026 modification specifies.

Patients with valvular atrial fibrillation — meaning AF caused by rheumatic mitral valve disease — have historically been outside the coverage boundary for LAAC. The procedure is not covered as a substitute for anticoagulation in patients who simply prefer not to take blood thinners without a medical contraindication. That distinction matters for documentation.

LAAC performed outside of a formal shared decision-making process has also been a coverage requirement. If your program doesn't have a documented shared decision-making visit in the record, you're exposed — regardless of whether the procedure itself was clinically appropriate.

Facilities that don't meet CMS's volume thresholds or operator credentialing requirements face non-coverage risk even when patient selection is perfect. Audit your facility's compliance with those criteria now, not after a denial.

Coverage Indications at a Glance

The following table reflects the established CMS framework for LAAC coverage. Until the full text of the May 2026 modification is available, treat this as your baseline — and update it once you've reviewed the modified policy document directly.

CMS Left Atrial Appendage Closure Billing Guidelines and Action Items 2026

LAAC billing is high-stakes. A single denied claim at this procedure's reimbursement level can be a five-figure hit. Here's what to do before May 15, 2026.

CPT, HCPCS, and ICD-10 Codes for Left Atrial Appendage Closure Under This Policy

The policy data available for this modification does not include specific CPT, HCPCS, or ICD-10 codes. Do not rely on codes published in third-party summaries without verifying them against the actual CMS policy document.

What to Look For When You Pull the Policy

LAAC procedures typically involve a specific set of CPT codes for the percutaneous structural heart intervention, as well as codes for imaging guidance used during the procedure. ICD-10-CM diagnosis codes for nonvalvular atrial fibrillation are the expected supporting diagnosis codes for medical necessity documentation.

Your billing team should confirm the exact codes CMS specifies in the modified policy. Using an incorrect code — or a code not listed in the policy — generates a claim denial regardless of how solid your clinical documentation is.

Where to Get the Correct Codes

Pull the full policy from the CMS National Coverage Determinations database. Cross-reference with your MAC's LCD and any associated billing and coding articles. Your MAC's billing and coding article is where the specific procedure codes are almost always listed — even when the NCD itself doesn't enumerate them.

If your MAC hasn't published a companion billing and coding article for this modification by May 1, 2026, contact your MAC directly. Don't guess.