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Who Should I Call for Assistance?

CGS (MAC) EUS (PECOS)
Help completing an Internet-based PECOS enrollment Forgotten PECOS User ID or password
Application status Error while completing application in PECOS
Change an application in progress System Administrator errors
Reassignment of benefits Questions about account registration
Question about required or supporting documents How to upload or reprint documents in PECOS
Missing application How to start revalidation application in PECOS
Rejected application Pay.gov questions
Revalidation requirements Access existing enrollments in PECOS
Questions about an existing enrollment  
CGS (MAC) EUS (PECOS)

Hours of Operation:
Monday – Friday, 8 am – 5 pm ET

Website:

Email (inquiries):
HHH Online Help Center

Email (corrections):
J15.provider.enrollment@cgsadmin.com

Phone:
877.299.4500 (option 3)

Mailing Address:
J15-HHH Provider Enrollment
CGS Administrators, LLC
PO Box 20016
Nashville, TN 37202

Hours of Operation:
Monday – Friday, 7 am – 7 pm ET

Website:
https://eus.cms.govExternal Website

E-mail:
EUS_Support@cms.hhs.gov

Phone:
866.484.8049

Mailing Address:
CMS External User Services
Mail Stop DO-01-50
7500 Security Blvd
Baltimore, MD 21244-1850

Revised: 03.31.2025

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