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Blue Shield of California Fax Number — Claims, Appeals, and Prior Authorizations

Blue Shield of California routes faxes by department, so there is no single company-wide line — utilization management, claims, appeals and grievances, and pharmacy prior authorization each publish their own number. The correct fax for a prior-authorization request is printed at the top of the prior-authorization form for that drug or service, while an appeal fax appears on the denial letter or Explanation of Benefits you are responding to. Members can find claims and customer-service contact details on the back of the Blue Shield ID card and in the Provider Connection portal for contracted offices. Because the number depends on the request type and on your role as a member, provider, or pharmacy, always match the line to the form in front of you rather than reusing an old one.

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Blue Shield of California Fax Number

Use the department-specific fax line printed on your Blue Shield of California prior-authorization form, appeal notice, or member ID card

Hours: Blue Shield of California utilization management and appeals teams generally review during business hours, Monday through Friday. Fax lines accept transmissions around the clock, but documents sent after hours or on weekends are queued for the next business day.

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What You Can Fax to Blue Shield of California

  • Prior-authorization and pre-service treatment requests
  • Claim submissions and corrected claims
  • Appeals and grievance forms responding to a denial
  • Coordination-of-benefits and other-coverage questionnaires
  • Medical records and clinical notes supporting a review
Tip: Everything you send Blue Shield of California about a patient is protected health information, so use a HIPAA-eligible service and label every page with the member's name, Blue Shield ID number, and date of birth in case pages separate. Send FAX Mail's HIPAA-eligible Business plan ($79.99/month) fits this workflow and returns a transmission receipt you can attach to the case file as proof of timely submission before an appeal or authorization deadline. Reference the authorization or claim number on the cover sheet so reviewers can match your fax to the open request.

Faxing to Blue Shield of California — FAQ

Pull up the current prior-authorization form for the specific drug or service on Blue Shield's provider site; the fax line for that review team is printed in the form's header or submission instructions. Pharmacy authorizations and medical authorizations go to different teams, so use the form that matches the request rather than a general number.

Standard appeal windows are stated on the denial letter or Explanation of Benefits itself, and they differ for expedited versus standard reviews. Fax your appeal before that stated date and keep the transmission receipt, because the timestamp is your evidence the appeal arrived on time.

Members are usually asked to mail paper claims to the address on the claim form, but the customer-service contact on the back of your ID card can confirm whether a fax is accepted for your plan. In-network providers typically submit claims electronically or by the fax line listed in their Provider Connection instructions.

Not always. Expedited or urgent requests often have their own intake line and a shorter turnaround, both noted on the authorization form. Mark the request as expedited on the cover sheet only when it truly meets urgent-care criteria, since that routing is reserved for time-sensitive cases.

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