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CGS Administrators, LLC

IVR: 866.238.9650 Customer Service and myCGS: 866.270.4909

Comprehensive Error Rate Testing (CERT) Documentation Updates

The CERT Review Contractor is AdvanceMed, an NCI company..

All initial Additional Documentation Request (ADR) letters for CERT are sent to the billing provider address on file with the National Supplier Clearinghouse (NSC) for Durable Medical Equipment Prosthetics, Orthotics and Supplies (DMEPOS) suppliers, or the Medicare Administrative Contractor (MAC).

Please see MLN Matters® Article SE1617External PDF and CERT Program Processes for additional information.

If a provider/supplier has a specific CERT correspondence address, they can provide it to the CERT Customer Service Representative (CSR) once they are contacted by the CERT CSR after the first documentation request letter is sent. The address will be used only for subsequent ADR letters for that sampled claim.

Important Information:

For Inquiries please contact:


You may submit documentation in any of the following ways:

Updated: 12.30.19

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