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To join Blue Shield or to determine eligibility, contact the City and County of San Francisco Health Service System:
Member Services Health Service System Phone: (415) 554-1750 or 1-800-541-2266 (toll free) Monday through Friday, 8:30 a.m. to 11:30 a.m. and 1:30 p.m. to 4:15 p.m.
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