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How to Fax to Blue Cross Blue Shield — Prior Authorization: Step-by-Step Guide

Healthcare & prior auth

Blue Cross Blue Shield — Prior Authorization

Chicago, IL

Verified Mar 2026

Fax number

(800) 282-0099
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What to include

  • ✓Subscriber/member ID and group number
  • ✓Patient name, DOB, and diagnosis codes
  • ✓Provider NPI and facility information
  • ✓Clinical documentation per plan requirements

Quick info

Department: BCBS Prior Authorization / Appeals

Fax line: (800) 282-0099

  • Use the fax number on your specific BCBS plan form — not a generic list
  • Include subscriber ID and group number
  • Attach payer-specific prior auth form

BCBS is a federation of independent plans — fax numbers vary by state and line of business. Always use the number on your member or provider materials.

Prerequisites — what to prepare

Before you fax Blue Cross Blue Shield — Prior Authorization, gather these items into one PDF when possible:

  • ✓Subscriber/member ID and group number
  • ✓Patient name, DOB, and diagnosis codes
  • ✓Provider NPI and facility information
  • ✓Clinical documentation per plan requirements

Step-by-step — send via RonFax

No fax machine required. Pay once from $1.99 for up to 3 pages ($0.50 per extra page).

  1. Confirm BCBS fax number from your plan's prior auth form.
  2. Prepare one PDF with form + supporting notes.
  3. Send with RonFax — track delivery on your status page.
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