US · guidance
CMS Pub. 100-04, ch. 32, § 370
Microvolt T-wave Alternans (MTWA)
On March 21, 2006, the Centers for Medicare & Medicaid Services (CMS) began national coverage of microvolt T-
wave Alternans (MTWA) diagnostic testing when it was performed using only the spectral analysis (SA) method for the
evaluation of patients at risk for sudden cardiac death (SCD) from ventricular arrhythmias and patients who may be
candidates for Medicare coverage of the placement of an implantable cardiac defibrillator (ICD).
Effective for claims with dates of service on and after January 13, 2015, Medicare Administrative Contractors (MACs)
may determine coverage of MTWA diagnostic testing when it is performed using methods of analysis other than SA for
the evaluation of patients at risk for SCD from ventricular arrhythmias. Further information can be found at Publication
History
(Rev. 3265, Issued: 05-22-15, Effective: 01-13-15, Implementation: 06-23-15)
Provenance
- Source
- cms.gov
- Retrieved
- 2026-08-25
- Edition
- iom-2026-08-25
- Content hash
a61bed01dc149a8ca4ee1bd19e6682c7bef946a94d10aadc70744b8e4cdcce54
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