Summary & Overview
CPT 93278: Signal‑Averaged Electrocardiography (SAECG)
CPT code 93278 designates a signal‑averaged electrocardiography (SAECG) procedure that captures low‑amplitude cardiac signals using surface electrodes to evaluate cardiac rhythm and identify conduction abnormalities. Nationally, this diagnostic electrophysiology code matters for cardiology practices, ambulatory diagnostic centers, and hospital outpatient departments that perform advanced noninvasive rhythm evaluation for patients with suspected arrhythmic substrates. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn what the code represents clinically, where the service is typically delivered, and which major payers are included in coverage discussions. The publication summarizes available benchmarks for coding and reimbursement patterns, highlights relevant policy updates that affect coverage and billing, and provides clinical context on when SAECG is used relative to other noninvasive rhythm tests. Data limitations are noted where input fields were not provided. The content is intended for national audiences including billing managers, practice administrators, and clinical leaders seeking a concise reference for CPT code 93278.
Billing Code Overview
CPT code 93278 describes a signal-averaged electrocardiography (SAECG) service in which a provider places surface electrodes on the chest to record and analyze averaged cardiac electrical signals for rhythm assessment. The service may include performance and interpretation of a standard electrocardiogram if performed as part of the encounter. This code represents both the technical and professional components of the SAECG service.
Service Type: Diagnostic cardiac electrophysiology testing (noninvasive)
Typical Site of Service: Outpatient clinic, hospital outpatient department, or ambulatory diagnostic center
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with a history of ischemic cardiomyopathy and recurrent palpitations is referred by the cardiology clinic for signal-averaged electrocardiography (SAECG) to evaluate for ventricular late potentials and arrhythmic substrate. The procedure takes place in an outpatient cardiac diagnostic laboratory or hospital cardiology department. The workflow includes registration and verification of orders and insurance, review of indications and contraindications, skin preparation and placement of surface electrodes on the chest, acquisition of multiple averaged high-gain ECG recordings, and interpretation by a qualified physician. The service may include acquisition of a contemporaneous standard electrocardiogram (ECG). The provider documents electrode placement, technical quality of signals, any patient symptoms during the test, and a professional interpretation describing presence or absence of late potentials and implications for arrhythmia risk stratification. Billing reflects both professional and technical components when reported as 93278.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the physician interpretation portion of the SAECG separate from technical performance. |