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Phone / Fax

Providers are required to use self-service technology, such as the Interactive Voice Response (IVR) system or the myCGS web portal to access claim status and beneficiary eligibility information. Customer Service Representatives (CSRs) will refer providers to these resources when calling for claims status or eligibility information. Exceptions will be made if your experience technical difficulties.

Before calling to speak with a Customer Service Representative (CSR) in the Provider Contact Center (PCC), consider using the Self Service Tools CGS offers.

Customer Service

Phone: 866.590.6703

  • Option 1: Claims
  • Option 2: Electronic Data Interchange (EDI)
  • Option 3: Provider Enrollment (PE)
  • Option 4: Overpayment Recovery (OPR)
  • Option 9: General Inquiries

8:00 a.m. – 5:00 p.m. (EST)

Fax: 1.615.664.5910

Other Options:
Mailing Address


Before you call, make sure you have:

  • Your National Provider Identifier (NPI);
  • Your Provider Transaction Access Number (PTAN);
  • The last 5 digits of the provider Tax Identification Number (TIN); and
  • Beneficiary's Medicare ID number, first name, last name and date of birth.

Telecommunications Devices for the Deaf (TTD/TTY)

Phone: 855.294.9889


Congressional Inquiries

Fax: 615.664.5923

Other Options:
Mailing Address


Cost Reports *

Phone: 217.726.6240

Other Options:


Credit Balance Reports

Fax: 803.462.2584

Other Options:

Reports may be faxed to:

MCBR Receipts
Attn: Credit Balance Reporting

Medical Director

Fax: 615.664.5961

Other Options:

Clinical questions may be submitted in writing to:

Neil Sandler, MD
Chief Medical Officer, J15 A/B MAC

Medical Review Additional Documentation Requests (ADRs)

Fax: 615.664.5941

Other Options:


Medicare Secondary Payer (MSP)

To update beneficiary information with the Benefits Recovery Coordination & Recovery Center (BCRC),

Phone: 1.855.798.2627
Hours: Monday through Friday from 8 a.m. to 8 p.m. ET, except holidays.

Fax: 1.405.869.3307 (address the fax to Medicare- MSP General Correspondence)

Please reference the additional information available in the CMS MLN Matters article SE1416External PDF

Overpayments *

Immediate Offset RequestsPDF
Fax: 615.664.5932

Other Options:

Extended Repayment Schedule (ERS) Requests
Fax: 615.664.5949

Other Options:


Quality Improvement Organization (QIO)

Kentucky – KEPRO Region 4

  • Phone: 888.317.0751
  • TTY: 855.843.4776
  • Fax: 844-878-7921

Ohio – Livanta Region 5

  • Phone: 888.524.9900
  • TTY: 888.985.8775

Other Options:

Qualified Independent Contractor (QIC) Part A West Jurisdiction (KY and OH)

QIC Part A West Standard Reconsiderations: 585.348.3020
QIC Part A West Expedited Reconsiderations: 585.348.3040

Other Options:
Mailing Address

Second-Level Appeals (Reconsiderations)

http://www.medicarepartaappeals.comExternal Website

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