Oscar Health prints a fax number on each of its forms. Prior authorization requests on Oscar's standard form go to 1-855-211-0731. Provider claims disputes go to 1-888-977-2062, the same number Oscar's Arizona member grievance form uses. Provider clinical appeals of authorization decisions go to 1-844-965-9054. If an Oscar letter about your case gives a different number, use that one.

Oscar hosts its PDF forms on a content service (cdn.sanity.io), but every form below is linked from a hioscar.com forms page. This guide lists the numbers, the form each one belongs to, and how to avoid a rejected fax.

  • Four verified Oscar fax lines, each from an Oscar form
  • Forms change by plan year and state, so download the current one
  • Providers must use Oscar's claims dispute form from October 1, 2025

Table of Contents

Verified Oscar Health fax numbers

Verified November 2026:

Who sends it What to fax Fax number Source
Providers Prior authorization (Oscar Standard Prior Authorization Form, June 2025) 1-855-211-0731 Oscar prior authorization form, linked from hioscar.com/forms/2026
Providers Claims disputes (Claims Disputes Provider Form) 1-888-977-2062 Oscar claims dispute form, linked from hioscar.com/providers/cover-forms
Providers Clinical appeals of authorization decisions 1-844-965-9054 Oscar provider clinical appeal form
Members (Arizona form, 2026) Grievances, attention Grievances 888-977-2062 Oscar member grievance form (AZ), linked from hioscar.com/forms/2026

Notes:

  • Prior authorization: the form also gives phone 1-855-672-2755.
  • Claims disputes: Oscar requires this form for provider disputes from October 1, 2025. A dispute without it may be returned.
  • Member grievances: the Arizona form says urgent cases should call 855-672-2755. Members in other states should use their own state's form from Oscar's forms page; the fax may be the same, but check the form.
  • Medicare Advantage: we did not find a current Oscar Medicare appeals fax on Oscar's site. Use the number in your plan documents or denial letter.

Get the right form first

Oscar publishes its forms by plan year and state at hioscar.com/forms, and provider forms at hioscar.com/providers. The fax number is printed on each form, so the safest approach is:

  1. Open Oscar's forms page for the current plan year.
  2. Choose the form for your request and the member's state.
  3. Use the fax printed on that form.

If your Oscar letter or the Oscar care team gives you a fax number for your case, use that instead.

How to fax Oscar, step by step

  1. Download the current form from hioscar.com.
  2. Fill in the member ID and any claim or authorization number.
  3. Attach the evidence: clinical notes for a prior authorization or appeal, the claim and remittance for a dispute.
  4. Sign the form where required.
  5. Fax it to the number on the form and keep the confirmation.

You can send a fax online for $2.99 with no subscription and no account.

Mistakes that slow down an Oscar fax

  • A claims dispute without Oscar's dispute form. Required from October 1, 2025.
  • A clinical appeal sent to the claims dispute line, or the reverse.
  • An old form. Download the current year's version.
  • Urgent requests sent only by fax. Call Oscar as well.

Fax your Oscar form now →

Frequently asked questions

What is the Oscar Health prior authorization fax number?

Oscar's Standard Prior Authorization Form (June 2025) lists fax 1-855-211-0731 and phone 1-855-672-2755. Check the form for the member's plan year and state on hioscar.com before sending.

What is the Oscar Health claims dispute fax number?

Oscar's Claims Disputes Provider Form lists fax 1-888-977-2062. Oscar requires providers to use that form from October 1, 2025.

Where do providers fax an Oscar clinical appeal?

Oscar's provider clinical appeal form for authorization decisions lists fax 1-844-965-9054.

How do members fax a grievance to Oscar?

Oscar's 2026 member grievance form for Arizona lists fax 888-977-2062, attention Grievances. For urgent cases it gives 855-672-2755. Members in other states should use the form for their state from hioscar.com/forms.

Do I need a fax machine to fax Oscar?

No. You can send a fax online from your browser or phone and get a delivery confirmation by email.

Sources