CMS Transtelephonic Pacemaker Monitoring Policy Updated: What Billing Teams Need to Know (NCD 345)

CMS has modified its National Coverage Determination for transtelephonic monitoring of cardiac pacemakers (NCD 345), effective March 12, 2026. This policy governs how Medicare Administrative Contractors (MACs) screen and pay claims for remote pacemaker monitoring services furnished by commercial suppliers, hospital outpatient departments, and physicians' offices. If your organization bills for cardiac device monitoring, the frequency guidelines and medical necessity criteria in this NCD directly affect your reimbursement.

What CMS NCD 345 Covers: Transtelephonic Pacemaker Monitoring Defined

The Centers for Medicare & Medicaid Services defines transtelephonic monitoring as a diagnostic service—not simply a device transmission. For a monitoring session to qualify for Medicare coverage, it must include three specific elements, all of which must be documented in the record:

• A minimum 30-second readable strip of the pacemaker in the free-running mode
• Unless contraindicated, a minimum 30-second readable strip of the pacemaker in the magnetic mode
• A minimum 30 seconds of readable ECG strip

All three elements are required. A claim missing documentation of any one of these components lacks the foundation to establish medical necessity under this NCD. Billing teams should audit their documentation workflows to confirm that monitoring reports capture each element explicitly.

One important distinction: the transmitting device provided to the patient is not covered as durable medical equipment (DME). CMS considers the transmitter a component of the diagnostic system as a whole. Monitoring suppliers are expected to build transmitter costs into their service charges—not bill separately for the equipment.

CMS Frequency Guidelines for Pacemaker Monitoring: Guideline I vs. Guideline II

CMS structures its frequency guidelines under two tracks, and knowing which applies to your patient population is essential for clean claims.

Guideline I applies to the majority of pacemakers currently in use. This is the default framework MACs use when evaluating claim frequency.

Guideline II applies only to pacemaker systems—both the pacemaker and leads—for which sufficient long-term clinical data exists to confirm they meet the Inter-Society Commission for Heart Disease Resources (ICHD) standards for longevity and end-of-life decay. To qualify under Guideline II, a system must meet both of the following ICHD benchmarks:

1. 90% cumulative survival at five years following implant
2. End-of-life decay of less than a 50% drop in output voltage and less than 20% deviation of magnet rate, or a drop of five beats per minute or less over a period of three months or more

If you're unsure whether a specific pacemaker system meets ICHD standards, CMS directs MACs to consult their medical advisers and organizations such as the North American Society of Pacing and Electrophysiology (NASPE), which publishes product reliability data.

Both Guideline I and Guideline II are further divided by device type: single-chamber and dual-chamber pacemakers. Dual-chamber monitoring carries additional clinical rationale under this policy—CMS explicitly recognizes that dual-chamber monitoring may detect failure of atrial-ventricular synchronization and the need for reprogramming, which supports medical necessity documentation for more frequent monitoring in appropriate patients.

Medical Necessity and Exceeding Frequency Thresholds

The frequency guidelines under NCD 345 define a maximum frequency for payment without additional claims development—not a minimum standard of care. MACs retain discretion to approve more frequent monitoring when medical necessity is clearly established.

Situations where more frequent monitoring may be covered include:

When monitoring exceeds the standard frequency thresholds, MACs are instructed to seek written justification from both the patient's treating physician and, where applicable, the monitoring service. For your billing and clinical teams, this means a documented order with explicit reasoning isn't optional—it's a prerequisite for payment on outlier claims.

Build a standing workflow for any patient whose monitoring frequency exceeds Guideline I or II thresholds: the physician note should state the clinical rationale, the monitoring report should reflect the technical findings, and both should be attached or accessible at the time of billing.

Benefit Category and Care Setting

NCD 345 applies under the Outpatient Hospital Services Incident to a Physician's Service benefit category. Services are covered when furnished in three settings:

• Commercial monitoring suppliers
• Hospital outpatient departments
• Physicians' offices

CMS notes this list of benefit categories may not be exhaustive. If your organization furnishes monitoring in a setting not listed here, consult your MAC before assuming coverage applies.

Affected Codes

This policy does not list specific CPT or HCPCS codes in the available policy data. Billing teams should consult their MAC's local coverage articles associated with NCD 345 for the applicable procedure codes used to bill transtelephonic pacemaker monitoring services in their jurisdiction. Contact your MAC directly or reference the CMS Coverage Database at cms.gov for code-level guidance tied to this NCD.

What Your Billing Team Should Do