Enrollment

From October 19 – December 4, 2026, AT&T retirees or eligible dependents can enroll in the 2027 AT&T-sponsored Group Medicare Plans online or by calling UnitedHealthcare 1-866-819-3448, TTY 711, Monday – Friday 8am-8pm CT.

New to Medicare

If you are aging into Medicare in 2027, please review the current year benefits and contact member services for assistance.
Call UnitedHealthcare 1-866-819-3448, TTY 711, Monday – Friday 8am-8pm CT.
General Medicare Questions? New to Medicare Brochure 

Required information for enrollment

Medicare requires the following in order for you to be enrolled in the AT&T-sponsored Group Medicare Advantage Plans insured by UnitedHealthcare®.

• You must be entitled to Medicare Part A and enrolled in Medicare Part B.
• You must continue paying your Medicare Part B premium.
• You must have a permanent street address (this cannot be a P.O. Box).
• You must have your Medicare ID number.
• You must live within the 50 United States, the District of Columbia, or U.S. territories.

Need help or have questions?

For additional enrollment questions, call 1-866-819-3448, 8 a.m. - 8 p.m. CT, Monday – Friday. TTY users, call 711. Or, contact us.