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Contact Us

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)

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 Health Insurance Claim (HIC) number, first name, last name and date of birth.

CTI User GuidePDF
Steps in Using the CTI SystemPDF
2020 Customer Service Holiday / Training SchedulePDF

Telecommunications Devices for the Deaf (TTD/TTY)

Phone: 855.294.9889

Interactive Voice Response (IVR)

Phone: 866.289.6501

You will need your facility's NPI, PTAN and the last 5 digits of the provider TIN.

IVR User GuidePDF
IVR Beneficiary Name to Number Converter

Development Request (Corrections)

Provider Enrollment Development Request via Email

Email Address:

Fax: 615.664.5935

If your application requires additional information, you will receive Provider Enrollment correspondence regarding your application, from We encourage you to respond to the development requests using email. When replying, please reply ALL and do not forward. This email account automated and is only monitored for corrections to applications in process. Any emails received that are confirming receipt of your email or general inquiries cannot be addressed.

Standard Mailing Address

J15-Part A Provider Enrollment
CGS Administrators, LLC
P.O. Box 20004
Nashville, TN 37202

Overnight Mailing Address

J15-Part A Provider Enrollment
CGS Administrators, LLC
26 Century Blvd STE ST610
Nashville, TN 37214-3685

Congressional Inquiries

Fax: 615.664.5923

Online Help Center

Part A Kentucky and Ohio Online Help Center

Looking for Part A Contact Information? This inquiry tool is designed for Medicare providers. Please complete the form and submit the inquiry.

Customer Service Toll Free Number and Option

J15 Part A Contact Information

This will help us direct you to the correct department quickly.

26 Century Blvd Ste ST610, Nashville, TN 37214-3685 © CGS Administrators, LLC. All Rights Reserved