General questions
For general questions about Blue Shield of California's Medicare Supplement Plans, Medicare Advantage - Prescription Drug Plans, and Medicare Prescription Drug Plans:
Phone: (855) 203-3874 (TTY: 711)
Hours: 8 a.m. to 8 p.m. seven days a week, from October 1 through March 31, and 8 a.m. to 8 p.m., weekdays from April 1 through September 30
Medicare program
For more information about Medicare plans and policies:
Phone: 1-800-MEDICARE (1-800-633-4227) [TTY: users can call (877) 486-2048]
Hours: 24 hours a day, seven days a week
Centers for Medicare and Medicaid Services
For more information about Center for Medicare and Medicaid Services:
Customer Service
Medicare Advantage Prescription Drug Plans
Members with a Medicare Advantage Prescription Drug Plan who want to know more about their plan should call:
Phone: (800) 776-4466 (TTY: 711)
Hours: 8 a.m. to 8 p.m. PT, seven days a week
Dual Special Needs Plans
Members with any Dual Special Needs Plans (HMO D-SNP) who want to know more about their plan should call:
Phone: (800) 452-4413 (TTY: 711)
Hours: 8 a.m. to 8 p.m. PT, seven days a week
Medicare Prescription Drug Plans
Blue Shield Medicare Prescription Drug Plan members with questions about their prescription drug coverage should call:
Phone: (888) 239-6469 (TTY: 711)
Hours: 8 a.m. to 8 p.m. PT, seven days a week
Medicare Supplement Plans
Blue Shield Medicare Supplement plan members with questions about their coverage should call:
Phone: (800) 248-2341 (TTY: 711)
Hours: 8 a.m. to 8 p.m. PT, seven days a week
Blue Shield of California is an HMO, HMO D-SNP, and a PDP plan with a Medicare contract and a contract with the California State Medicaid Program. Enrollment in Blue Shield of California depends on contract renewal.
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Page last updated: 10/1/2025