CorporateBusiness Services
CGS Associates, LLC

Contact Other CGS Departments/Resources

All Written Inquiries - Remember to include an "attention to" note on the first page of each written inquiry. This will help us direct your inquiry to the correct department quickly.

You may also contact us online by using our Online Help Center.

Contact Information
Appeals - Redetermination Requests CGS
P.O. Box 20009
Nashville, TN 37202

FAX: 615.782.4630
ADMC - send requests to: CGS
Attn: ADMC
P.O. Box 20010
Nashville, TN 37202
OR
FAX: 615.782.4647
Beneficiary Customer Service Calls 1.800.Medicare
Claim Reopenings (Adjustments) CGS
P.O. Box 20010
Nashville, TN 37202

For a reopening with an underpayment fax to: 615.782.4649
For a reopening with an overpayment fax to: 615.782.4477
EDI - Electronic Claim Submission; Electronic Remittance Notices, 276/277 transactions Jurisdiction C CEDI Helpdesk
Toll-free: 1.866.311.9184
Hours: 9:00 a.m. - 7:00 p.m. Eastern Time, Monday - Friday

Jurisdiction C CEDI websiteExternal Website

Email Address: ngs.cedihelpdesk@wellpoint.com
Address for EDI Inquiries
Written Communications:

National Government Services, Inc.
Attn: CEDI
PO Box 7165

Indianapolis, IN 46207-7165
Address for Enrollment
Written Communications:

National Government Services, Inc.
Attn: CEDI Enrollment
PO Box 7165

Indianapolis, IN 46207-7165
Electronic Funds Transfer CGS
Attn: EFT-DME
P.O. Box 20010
Nashville, TN 37202
General Fax Number 615.782.4490
Paper Claim Submission CGS
P.O. Box 20010
Nashville, TN 37202
Provider Customer Service Calls 1.866.270.4909 (customer service)
1.866.238.9650 (IVR - interactive voice response)
1.888.204.3771 (hearing impaired)
Interactive Voice Response (IVR) script Interactive Voice Response (IVR) script
IVR Summary Flow Chart IVR Summary Flow ChartPDF
Reconsiderations

C2C Innovative Solutions, Inc.
ATTN: DME QIC
P.O. Box 44013
Jacksonville, FL 32231-4013
Website: http://www.c2cinc.com/QICDME.aspxExternal Website

Refunds CGS
DME MAC Jurisdiction C
P.O. Box 955152
St. Louis, MO 63195-5152
Supplier Enrollment National Supplier Clearinghouse Palmetto GBA * AG-495
P.O. Box 100142
Columbia, SC 29202-3142
1.866.238.9652
Telephone Reopenings 1.866.813.7878
Written Inquiries CGS
P.O. Box 20010
Nashville, TN 37202

Updated: 12.10.15

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