How to Fax a Prior Authorization Request to Blue Cross Blue Shield
Blue Cross Blue Shield is a federation of independent, locally operated plans, so a prior authorization goes to the member's specific BCBS company rather than to one national office. This guide explains how to identify the right local plan, assemble a reviewable request, find the fax line printed on that plan's own form, and keep proof of the send while the coverage decision is pending.
Does Blue Cross Blue Shield accept a fax?
Blue Cross Blue Shield plans accept prior authorization requests by fax, but each independent plan runs its own intake, so the accepting line belongs to the member's local BCBS company and the service being requested. There is no single BCBS fax that serves every member; the destination is defined by the plan on the card.
Finding the official fax number
Start with the three-letter prefix on the member's BCBS card, which identifies the home plan, then use that plan's prior authorization form and provider portal, where the current fax number is printed. The member's benefit documents and any determination letter name the handling office too, so confirm the number on the correct local plan's live form rather than assuming a shared BCBS line.
What to include on every page
- The member's name, date of birth, and full BCBS ID including the alpha prefix
- The ordering provider's name, NPI, and a fax where the local plan can reply
- The requested procedure code or drug and strength, with matching ICD-10 diagnoses
- Clinical notes and prior-therapy records meeting the local plan's coverage criteria
- A cover sheet naming the member's home plan and whether the request is urgent
How to fax Prior Authorization Request Form to Blue Cross Blue Shield
- 1Identify the member's home BCBS plan from the alpha prefix on the ID card
- 2Complete that plan's prior authorization form for the requested service or drug
- 3Verify the current fax number on the local plan's form or provider portal
- 4Merge the form and supporting records into one legible PDF
- 5Open Send FAX Mail, upload the PDF, enter the confirmed fax number, and send
- 6Save the delivery confirmation with the member's chart as proof of submission
Confirming it arrived
Send FAX Mail returns a dated confirmation the moment the request reaches the local BCBS plan's fax line — keep it with the member's file. Each independent plan issues its own determination by portal, fax, or letter, so the confirmation is your evidence of the submission date if that plan's timeline is later contested.
What’s current · as of July 2026
- HIPAA large-breach reporting threshold
- 500+ individuals — reported to HHS OCR without unreasonable delay Source: HHS Office for Civil Rights
- HIPAA documentation retention period
- 6 years from creation or last-effective date Source: HHS — HIPAA Administrative Requirements (45 CFR 164.316)
Recent updates
Federal interoperability rules keep pushing healthcare past the fax machine
CMS has advanced a series of interoperability rules that press hospitals, payers, and providers toward electronic data exchange and standardized claims attachments. The direction of travel is clear: paper and analog fax workflows are being replaced by digital transmission that carries an auditable record — which is exactly what a cloud fax with delivery confirmation provides for offices not yet on a full EHR pipeline.
CMS →Healthcare breach reporting keeps document handling under scrutiny
Ongoing reporting on HIPAA breaches and OCR settlements underscores how much scrutiny falls on how medical documents are stored, sent, and received. Sending records through a controlled, access-logged channel rather than an unmanaged machine reduces the mishandling risks that show up repeatedly in breach analyses.
HIPAA Journal →HHS OCR continues enforcing HIPAA safeguards on how PHI is transmitted
The HHS Office for Civil Rights enforces the HIPAA Security Rule's requirement that covered entities apply administrative, physical, and technical safeguards to protected health information in transit. Faxing PHI is permitted, but the sending practice is responsible for confirming the destination and controlling access — the reason healthcare senders favor a channel that logs each transmission and its recipient.
HHS Office for Civil Rights →
Faxing Prior Authorization Request Form to Blue Cross Blue Shield — FAQ
No. BCBS is an association of separate, locally run companies, and each handles its own authorizations. A request has to reach the member's home plan — the one that issued the card — so a number that works for one BCBS company will not necessarily route to another.
The alpha prefix — the letters before the ID number on the card — identifies the home plan. Match that prefix to the corresponding local BCBS company, then pull the prior authorization form and fax line from that plan's provider resources rather than a generic national page.
Most BCBS plans offer an online prior authorization option through their provider portal, and using it is entirely acceptable. Offices still fax when the clinical documentation is already assembled into a single PDF; the important thing is that the local plan receives a complete request through whichever channel it accepts.
The Send FAX Mail confirmation logs the exact date and time the pages reached the plan's fax line, which stands as your first proof of receipt. After that, the request usually surfaces in the local plan's provider portal once staff enter it, letting the office verify it reached the queue.
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