Transtelephonic Monitoring of Cardiac Pacemakers — NCD 345 | CMS Coverage Update

CMS modified NCD 345 governing transtelephonic monitoring of cardiac pacemakers, effective January 9, 2026. Here's what billing teams need to do.

The Centers for Medicare & Medicaid Services updated NCD 345, the National Coverage Determination governing Medicare coverage of transtelephonic pacemaker monitoring services. This policy covers monitoring furnished by commercial suppliers, hospital outpatient departments, and physicians' offices. The update reinforces strict frequency guidelines that your Medicare Administrative Contractor will use to screen claims before payment — and if your documentation doesn't line up, you're looking at claim denial.

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Quick-Reference Table

Field	Detail Copy
Payer	CMS (Centers for Medicare & Medicaid Services)
Policy	Transtelephonic Monitoring of Cardiac Pacemakers
Policy Code	NCD 345
Change Type	Modified
Effective Date	January 9, 2026
Impact Level	Medium
Specialties Affected	Cardiology, Electrophysiology, Hospital Outpatient Departments, Physicians' Offices, Commercial Monitoring Suppliers
Key Action	Audit your monitoring documentation to confirm each claim includes the three required ECG strip elements and falls within MAC-approved frequency thresholds

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CMS Transtelephonic Pacemaker Monitoring Coverage Criteria and Medical Necessity Requirements 2026

The CMS transtelephonic pacemaker monitoring coverage policy is built on a straightforward clinical premise: telephone monitoring detects early signs of pacemaker failure before a patient ends up in the ER with a dead device. That's the medical necessity argument, and CMS accepts it — but only when you document the right elements and bill at the right frequency.

To meet medical necessity under NCD 345, every monitoring session must include three specific elements. Miss one, and you've billed a service that doesn't meet the coverage policy definition.

The three required elements are:

#	Covered Indication Copy
1	A minimum 30-second readable strip of the pacemaker in the free-running mode
2	A minimum 30-second readable strip of the pacemaker in the magnetic mode (unless contraindicated)
3	A minimum 30 seconds of readable ECG strip

All three must be documented. "Readable" is doing real work in this policy — an artifact-heavy or incomplete strip isn't going to hold up on review. Train your clinical staff on what "readable" means in the context of a MAC audit.

The magnetic mode strip has one out: it can be skipped when contraindicated. But if you skip it, document why. MACs will look for that justification.

Prior Authorization and Medical Necessity for Frequency

There's no specific prior authorization requirement named in NCD 345. But the frequency guidelines function as a practical prior authorization screen. Your MAC uses these thresholds to approve or flag claims before payment — exceeding the threshold without written physician justification triggers additional claims development, which is the MAC's version of asking "prove it."

If a patient's condition requires more frequent monitoring than the guidelines allow, you need written justification from the treating physician and/or the monitoring service. Get that documentation before you bill — not after you receive a request for records.

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CMS Transtelephonic Pacemaker Monitoring Frequency Guidelines and Coverage Rules 2026

This is where the policy gets specific, and where most billing errors will occur. The frequency guidelines divide pacemakers into two main categories. Understanding which category applies to each patient is the most important thing your billing team can do right now.

Guideline I applies to the majority of pacemakers currently in use. If you don't know for certain that a pacemaker system qualifies under Guideline II, bill under Guideline I.

Guideline II applies only to pacemaker systems — both the pacemaker and leads — that meet the Inter-Society Commission for Heart Disease Resources (ICHD) standards for longevity and end-of-life decay. Those standards are specific:

• 90% cumulative survival at five years following implant
• 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 your monitoring organization isn't sure whether a specific device meets ICHD standards, consult the North American Society of Pacing and Electrophysiology, which publishes product reliability data. Your MAC's medical adviser is also a resource. Don't guess.

Single-Chamber vs. Dual-Chamber Pacemakers

Each guideline category is further broken down by device type: single-chamber and dual-chamber pacemakers. Dual-chamber devices carry additional clinical complexity — the monitoring may detect failure of synchronization between the atria and ventricles, and the need for reprogramming. That complexity is reflected in the frequency guidelines, which differ between device types.

Your billing team needs to know which device type each patient has. That information should come from the ordering physician's documentation and the device record. If your intake process doesn't capture single-chamber vs. dual-chamber status, fix that process now — before the January 9, 2026 effective date has claims rolling through your system.

Maximum Frequency, Not Minimum

Here's a nuance that trips up billing teams: these guidelines set a maximum frequency for automatic payment, not a minimum standard of care. Billing below the threshold is fine. Billing above it without written justification is what generates claims development and potential denial.

More frequent monitoring can be covered when your MAC determines medical necessity — for example, when a patient's condition is deteriorating, or when a pacemaker is showing unexpected defects or premature failure. But "can be covered" means "will be scrutinized." The reimbursement is there, but the documentation burden is higher.

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CMS Transtelephonic Pacemaker Monitoring Exclusions and Non-Covered Indications

The transmitting device furnished to the patient is not covered as durable medical equipment (DME). This is explicit in NCD 345, and it matters for how you structure your billing.

The transmitter is one component of the diagnostic system. CMS treats it as part of the monitoring service infrastructure, not as a separately billable DME item. Suppliers and hospital outpatient departments should factor transmitter costs into their monitoring service charges — not bill the device separately under a DME benefit category.

If your organization has been billing the transmitter as DME, stop. That's a claim denial waiting to happen, and it's a repayment risk on historical claims. Talk to your compliance officer about whether a look-back is warranted.

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Coverage Indications at a Glance

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CMS Transtelephonic Pacemaker Monitoring Billing Guidelines and Action Items 2026

The policy is clear. The documentation requirements are specific. Here's what your team needs to do before and after January 9, 2026.

Copy Action Items

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CPT, HCPCS, and ICD-10 Codes for Transtelephonic Pacemaker Monitoring Under NCD 345

Covered and Applicable Codes

NCD 345 does not list specific CPT or HCPCS codes in the policy data available for this update. This is common for older NCDs that predate current code-level specificity in CMS policy documents.

For transtelephonic pacemaker monitoring billing, work with your MAC to confirm the current applicable procedure codes in your jurisdiction. Your MAC's local coverage determination (LCD) or billing guidance will specify the codes used to report these services. Do not assume a code applies without MAC confirmation — the wrong code on a pacemaker monitoring claim creates both a claim denial risk and a potential compliance issue.

What to Ask Your MAC

Contact your MAC and ask specifically:

• Which CPT or HCPCS codes they accept for transtelephonic pacemaker monitoring under NCD 345
• Whether they have an active LCD that supplements NCD 345 with code-level guidance
• Whether frequency thresholds vary by code (some MACs distinguish between codes for single-session monitoring vs. monthly service bundles)

If your MAC has an LCD that references NCD 345, that LCD's code list governs your billing in that jurisdiction.

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