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In page T wave alternans:

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This test is significant for insurance companies because it can potentially save thousands of dollars per patient by reducing the implantation of unnecessary implantable cardiac defibrillators (ICD's).[1] Use of the spectral method for measuring Microvolt T-wave Alternans has been approved for reimbursement by Medicare, as well as major insurers such as Aetna, Cigna, and Humana. The Spectral Method was FDA approved in 2001 and approved in 2006 for federal reimbursement by the Center for Medicare and Medicaid Services (CMS), (CAG-00293N). The MMA method received federal approval for local CMS contractor reimbursement in 2015 (CAG-00293R2). Both methods use CPT code 93025.[citation needed]