Send Us a Letter
You can send HPSM information related to your health coverage via mail or fax. Mail and faxes are
checked periodically throughout each working day. HPSM staff may respond to you by phone or in writing
if additional information is needed.
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Fax Number: 650-616-2190
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Mailing Address
Health Plan of San Mateo
701 Gateway Blvd., Suite 400
South San Francisco, CA 94080
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Existing members can drop in to speak with a CareAdvantage Navigator. No appointments necessary.
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Member Services
Health Plan of San Mateo
701 Gateway Blvd., Suite 400
South San Francisco, CA 94080
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Office Hours
Monday, Tuesday, Wednesday,
Friday 8:00 a.m. to 5:00 p.m.
Thursday, 9:30 a.m. to 5:00 p.m.
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Our office is wheelchair accessible.
People with hearing or speaking difficulties can call our TTY number.
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Hearing/speech impaired
TTY: 1-800-735-2929 or dial 7-1-1
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Monday through Sunday, 8:00 a.m. to 8:00 p.m.
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