CPT 93278Cardiology

Ecg/signal-averaged

CPT 93278 covers signal-averaged electrocardiography (ECG), a specialized heart test that analyzes electrical signals to detect subtle abnormalities that might predict dangerous heart rhythms.

Showing rates for

National Average

Base Medicare rate

$30.73

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

0.25

PE RVU (NF)

0.68

MP RVU

0.02

Total RVU

0.95

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Bill global code 93278 only when both technical and professional components are provided by same entity; otherwise split with 26/TC modifiers
Impact: Improper modifier use can result in 50-60% underpayment or overpayment recoupment
Document specific signal averaging parameters including number of beats averaged (typically 200-300), filter settings, and presence/absence of late potentials in three orthogonal leads
Impact: Missing technical parameters are leading cause of medical necessity denials, risking full $30.73 payment
Verify LCD coverage for signal-averaged ECG in your MAC jurisdiction as some require specific diagnosis codes like post-MI status or documented ventricular arrhythmia
Impact: Non-covered indications result in 100% denial; advance beneficiary notice (ABN) may allow patient billing
Do not bill 93278 on same day as routine ECG (93000-93010) without modifier 59 and clear documentation showing separate medical necessity
Impact: Bundling edits may auto-deny 93278, losing $30.73 without proper modifier application
Ensure physician interpretation report specifically addresses filtered QRS duration, RMS voltage, and low amplitude signal duration with clinical correlation
Impact: Generic ECG interpretation without SAECG-specific elements triggers downcoding or denial on audit
For hospital outpatient departments, verify place of service code 22 is used; incorrect POS can trigger facility vs non-facility rate confusion
Impact: Both rates are $30.73 for 93278, but POS errors create claim processing delays and potential recoupment issues

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 93278 in 2025?

The 2025 Medicare national average payment for CPT 93278 is $30.73 for both facility and non-facility settings. This is based on 0.95 total RVUs multiplied by the conversion factor of 32.3465. Actual reimbursement may vary by geographic locality.

Can CPT 93278 be billed with a regular ECG on the same day?

Yes, but it requires modifier 59 or XU and clear documentation showing the signal-averaged ECG serves a distinct clinical purpose separate from the routine ECG. Both tests must have separate medical necessity, and the SAECG must include specific signal averaging parameters in the interpretation.

What diagnosis codes support medical necessity for CPT 93278?

Common supporting diagnoses include prior myocardial infarction (I25.2), ventricular tachycardia (I47.2), unexplained syncope (R55), family history of sudden cardiac death (Z82.41), and cardiomyopathy (I42.x). However, coverage varies by Medicare Administrative Contractor LCD, so verify local requirements.

What are the RVU values for CPT code 93278?

CPT 93278 has 0.25 work RVUs, 0.68 practice expense RVUs (both facility and non-facility), and 0.02 malpractice RVUs, totaling 0.95 RVUs for 2025 based on CMS Medicare Physician Fee Schedule.

How is signal-averaged ECG different from a regular ECG for billing purposes?

Signal-averaged ECG (93278) uses computer processing to average hundreds of cardiac cycles to detect low-amplitude late potentials, requiring specialized equipment and interpretation. Regular ECG (93000-93010) records standard 12-lead electrical activity. Documentation must specifically reference signal averaging parameters to justify 93278 billing.

Do I need modifier 26 or TC when billing CPT 93278?

Use modifier 26 if only providing physician interpretation without owning equipment. Use modifier TC if only providing technical component (equipment, technician) without physician interpretation. Bill global 93278 without modifiers only when the same entity provides both components.

What documentation is required to avoid denials for CPT 93278?

Required documentation includes number of beats averaged, filtered QRS duration, RMS40 voltage, LAS40 duration, noise levels, three-lead vector analysis, presence/absence of late potentials, physician interpretation with clinical correlation, and medical necessity statement linking to patient's cardiac risk factors or history.