Customer Service


Sterling Phone Numbers

If your questions, comments, or requests require immediate assistance, please find the appropriate phone number below and one of our Sterling representatives will gladly help you.  If you reach our Customer Service Center after hours, you may submit a request via our Contact Us page.

Pharmacies and Formulary Part-D Coverage and Exceptions
Customer Service Hours:
Services available, 24 hours a day, 7 days a week
For questions related to pharmacy coverage for plans:
Sterling Option IISM and Sterling Option IVSM 1-866-454-7141
Sterling Partners® - Montana 1-866-467-8545
Sterling RxSM 1-866-364-8012
TTY/TDD Users should call 1-866-899-2114
Customer Service Hours for all other questions:
Nov 15 through March 1: 7 days a week, 8:00 a.m. - 8:00 p.m. in your time zone. March 2 through November 14: Monday - Friday, 5:00 a.m. - 5:00 p.m. Pacific Time.
[Please leave a message if you call after hours and someone will return your call promptly.]
Medicare Advantage program:
Current members should call 1-888-858-8551
TTY/TDD 1-888-858-8567
Prospective members should call 1-888-858-8572
TTY/TDD 1-888-858-8567
Medicare Part-D Prescription Drug program:
Current members should call 1-866-445-9792
TTY/TDD 1-888-858-8567
Prospective members should call 1-888-909-1713
TTY/TDD 1-888-858-8567
For More information about Medicare, please call Medicare. 1-800-MEDICARE 1-800-633-4227
TTY/TDD 1-877-486-2048
You can call 24 hours a day, 7 days a week. Or, visit www.medicare.gov on the web. Back to Top
Medicare Supplement:
Sterling PremierSM and Sterling Medicare SelectSM 1-800-688-0010


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