Revenue Cycle Insider

Find out which condition’s symptoms the Watchman device tries to mitigate.

When you hear “Watchman,” your mind may go to the 2009 superhero film, a city wall guard of the 13^th century responsible for protecting the city, or modern-day law enforcement. Yet in cardiology, the Watchman represents a very different kind of guardian: one that protects the heart from within.

Understand Watchman Device and Abilities

The Watchman device is a small, umbrella-shaped implant designed to block off the left atrial appendage (LAA). The LAA is a small pouch-like structure in the left atrium where blood clots commonly form in patients with atrial fibrillation (AF).

For millions living with AF, the irregular heartbeat increases the risk of stroke fivefold, as clots formed in the LAA can travel to the brain and cause potentially devastating consequences such as a stroke, coma, long-term brain death, and neurological damage. The Watchman offers a revolutionary alternative: A one-time procedure that allows patients to reduce or even eliminate the need for anticoagulation therapy while maintaining strong protection against stroke.

This device reduces stroke risk in patients without the need for lifelong blood thinners. AF affects one in 22 adults, with that number increasing sharply after age 65; it occurs more frequently in men, white individuals, and those with comorbidities such as high blood pressure and diabetes.

The mainstream treatment for AF, oral anticoagulants, has been in existence since the 1950s, with novel oral anticoagulants (NOACs) becoming widely available in 2010. Patients cannot always safely tolerate anticoagulants due to gastrointestinal bleeding risk, anticoagulation-related nephropathy, skin necrosis, and lifestyle challenges. For both patients and providers, the Watchman is a breakthrough in care.

See How Device Is Placed

The Watchman device, also known as a left atrial appendage closure (LAAC) is placed percutaneously. It is typically placed utilizing transseptal catheterization through the femoral vein. During the procedure, the interventional cardiologist advances a catheter through the venous system, crosses the interatrial septum to reach the left atrium, and deploys the Watchman device to seal off the LAA. This approach is often a safer alternative for patients with bleeding risks or other contraindications.

This minimally invasive approach offers an effective and safer alternative for patients who have contraindications to oral anticoagulants, such as those with a history of GI bleeding, recurrent falls, or bleeding disorders. It is important to emphasize that the Watchman is not a coronary stent nor a pacemaker — its purpose, structure, and implantation technique are entirely unique.

Navigate Documentation to Report Care Accurately

For coders, this new treatment has presented a new challenge. Since this is a specialized treatment, accurate coding requires knowledge of the procedure, reviewing details in the provider notes, and correct application of the CPT^® and ICD-10-CM coding guidelines.

Thorough and precise coding allows the clinical story to be accurately reflected in the medical record, supporting appropriate reimbursement and compliance with payer requirements. When all these elements are clearly documented by the physician and correctly interpreted by the coder, the result is a comprehensive and defensible representation of the patient’s condition, the procedure performed, and the rationale for care. This creates a full clinical picture for the insurance company.

Creating a full and accurate clinical picture is essential not only for proper reimbursement, but also to represent the true complexity of patient care. Coding goes beyond assigning procedure and diagnosis codes; it tells the patient’s medical story in a complex combination of numbers and letters. By coding all documented comorbidities, stroke risk factors, and contraindications to anticoagulation, coders provide a more comprehensive representation of the patient’s health status and the medical necessity of the Watchman procedure. When these elements are clearly documented by the physician and accurately coded, professional fee (pro-fee) coders help ensure compliance, support appropriate reimbursement, and contribute to data integrity for quality reporting and future clinical decision-making.

Don’t Forget to Abide by Compliance and Coding Guidelines

The Centers for Medicare & Medicaid Services (CMS) has >specific guidelines that are critical elements for coverage and compliance that also reduce the risk of claim denials. A local coverage determination (LCD) can be found on CMS’ website. The patient’s stroke risk must be documented using the CHADS₂ score. Documentation should include the patient’s eligibility for short-term anticoagulation, typically with warfarin, and there must be a record of formal shared decision-making discussing the procedure and alternatives. This is on inpatient only (IPO) list. The procedure must be performed by a physician trained in LAAC device implantation; the treating hospital and multidisciplinary team (MDT) must participate in a prospective national registry tracking patient selection, procedural details, device deployment, outcomes, and follow-up. Including these elements ensures compliance.

Pro-fee coding for the Watchman insertion relies on detailed documentation of both the procedure and the underlying condition. The primary CPT^® code is 33340 (Percutaneous transcatheter closure of the left atrial appendage with endocardial implant, including fluoroscopy, transseptal puncture, catheter placement(s), left atrial angiography, left atrial appendage angiography, when performed, and radiological supervision and interpretation). Bundled into this code is the Watchman procedure and fluoroscopy, transseptal puncture, catheter placements, left atrial angiography, left atrial appendage angiography, and radiological supervision and interpretation.

Additional CPT^® codes may be used for related imaging, such as transesophageal echocardiography (TEE) — for example, a baseline TEE or intraoperative TEE. ICD-10-CM codes should capture the patient’s underlying AF: I48.0 (Paroxysmal atrial fibrillation), I48.1 (Persistent atrial fibrillation), or I48.2 (Chronic atrial fibrillation).

Accurate coding of the Watchman relies on more than knowing the CPT^® and ICD-10-CM codes. It is critical to have a thorough understanding of the patient’s clinical presentation. Thorough documentation from the provider is essential to capture comorbidities, stroke risk factors, and contraindications to anticoagulation. Together, these items support the medical necessity of the procedure. When coders have clear, detailed notes, they can assign codes that accurately reflect the patient’s condition and the complexity of care provided. This not only ensures proper reimbursement but also contributes to compliance, quality reporting, and overall data integrity.

Effective communication between coders and providers is key. Communication eliminates any gaps or ambiguities in documentation. By working together, clinical and coding teams can create a comprehensive, accurate record that benefits patients, providers, the healthcare organization, and insurance.

Amanda Donoho, MA, CPC, CRC, COC, CPMA, Senior Auditor/Educator,
Facility Coding/Audit & Education Services, Pinnacle Enterprise Risk Consulting Services LLC