CPT 93025Cardiology

Microvolt t-wave assess

CPT code 93025 is used for microvolt T-wave alternans (MTWA) testing, a specialized heart test that measures tiny variations in the T-wave portion of an electrocardiogram to assess the risk of dangerous heart rhythms. This non-invasive cardiac test helps doctors predict the likelihood of sudden cardiac arrest in patients with heart disease.

Showing rates for

National Average

Base Medicare rate

$123.89

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

0.75

PE RVU (NF)

3.04

MP RVU

0.04

Total RVU

3.83

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

NCCI bundling edits

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Billing tips

Verify that the testing equipment and methodology meet FDA standards for microvolt T-wave alternans detection before billing 93025
Impact: Prevents denials for non-compliant testing methods; equipment must measure microvolts (not millivolts) and use validated algorithms
Document the specific indication for MTWA testing, particularly the patient's ejection fraction, underlying cardiac diagnosis, and ICD candidacy evaluation
Impact: Medicare coverage is limited to specific indications; inadequate documentation leads to medical necessity denials affecting the full $123.89 reimbursement
Do not bill 93025 on the same day as standard ECG interpretation codes (93000, 93010) for the same cardiac assessment unless distinct and separately documented
Impact: Bundling edits may reduce or eliminate payment; ensure separate medical necessity for each service
Ensure the interpretation report specifically addresses T-wave alternans findings, quantitative measurements, test quality, and clinical significance for arrhythmia risk
Impact: Generic ECG reports will not support 93025; detailed MTWA-specific documentation is required to sustain the 3.83 total RVUs
Check LCD and NCD policies as Medicare coverage for MTWA testing varies and may require specific heart failure criteria or pre-ICD evaluation context
Impact: Non-covered indications result in complete denial; obtaining ABN when coverage is uncertain protects practice from $123.89 loss
Bill 93025 only once per testing session regardless of multiple electrode placements or test repetitions during the same encounter

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 93025 in 2025?

The 2025 Medicare national average reimbursement for CPT 93025 is $123.89 for both facility and non-facility settings. This rate is based on 3.83 total RVUs (0.75 work RVU, 3.04 practice expense RVU, and 0.04 malpractice RVU) multiplied by the 2025 conversion factor of 32.3465.

What is microvolt T-wave alternans testing and when is CPT 93025 used?

Microvolt T-wave alternans (MTWA) testing is a specialized cardiac diagnostic procedure that measures microscopic beat-to-beat variations in the T-wave portion of the ECG to assess risk of sudden cardiac death. CPT 93025 is used to report the physician's professional interpretation of MTWA data, typically for patients being evaluated for ICD placement or those with heart failure and reduced ejection fraction.

Can CPT 93025 be billed with a regular ECG code on the same day?

Billing 93025 with standard ECG codes (93000, 93010) on the same day requires careful documentation of separate medical necessity for each service. The services must be distinct and separately identifiable, with modifier 59 potentially required. Many payers have bundling edits that may deny one service unless clear documentation supports both tests serving different clinical purposes.

What documentation is required to bill CPT 93025 without denials?

Documentation must include the clinical indication for MTWA testing, patient's cardiac diagnosis and ejection fraction, specific microvolt T-wave alternans measurements, heart rate achieved, test quality assessment, interpretation of results as positive/negative/indeterminate, and correlation with sudden cardiac death risk. Generic ECG reports are insufficient; the interpretation must be specific to MTWA methodology and findings.

What are the RVUs for CPT code 93025 in 2025?

CPT 93025 has 3.83 total RVUs in 2025, consisting of 0.75 work RVU, 3.04 practice expense RVU (both facility and non-facility), and 0.04 malpractice RVU. These values are from the CMS Medicare Physician Fee Schedule RVU25A released December 23, 2024.

Does Medicare cover microvolt T-wave alternans testing for all cardiac patients?

No, Medicare coverage for MTWA testing (CPT 93025) is limited to specific indications, typically patients being evaluated for ICD placement or sudden cardiac death risk stratification with documented cardiomyopathy and reduced ejection fraction. Coverage policies vary by Medicare Administrative Contractor (MAC), and Local Coverage Determinations (LCDs) should be reviewed before performing the test to ensure medical necessity criteria are met.

How often can CPT 93025 be billed for the same patient?

Frequency of MTWA testing is not specifically defined in CPT guidelines, but Medicare and commercial payers typically limit coverage based on medical necessity and clinical change. Repeat testing generally requires documentation of interim clinical events such as new myocardial infarction, significant change in ejection fraction, or change in cardiac medications affecting arrhythmia risk. Check specific payer policies for frequency limitations.