For pharmacy prior authorization, Ambetter's prescription drug request form says to fax (800) 977-4170. Member appeals and grievances go to a state-specific line: 1-833-886-7956 in Illinois, and in Texas 1-866-918-2266 for medical appeals and 1-866-683-5369 for grievances. All of these come from ambetterhealth.com. If your Ambetter letter gives a different number, use that one.

Ambetter is the Marketplace brand of Centene, sold through local health plans in many states. This guide lists the Ambetter fax numbers we verified, explains how state affects the number, and covers what to include.

  • One pharmacy prior authorization fax used across states
  • Appeals and grievances by state, with verified Illinois and Texas lines
  • Each number is linked to the Ambetter form or guide it came from

Table of Contents

How Ambetter fax lines work

Ambetter plans are issued by a Centene health plan in each state, such as Ambetter of Illinois or Ambetter from Superior HealthPlan in Texas. That means:

  • Pharmacy prior authorization for prescription drugs uses a shared request form and fax line.
  • Member appeals and grievances are handled by the plan in your state, with its own fax.
  • Medical prior authorization and provider disputes depend on the state plan's provider portal and rules.

Verified Ambetter fax numbers

Verified November 2026:

Plan What to fax Fax number Source
Ambetter, prescription drugs Prior Authorization Request Form (from the prescriber) (800) 977-4170 Ambetter Prior Authorization Request Form
Ambetter of Illinois Member grievances and appeals 1-833-886-7956 Ambetter of Illinois grievance and appeal form
Ambetter in Texas Medical appeals 1-866-918-2266 Ambetter Texas appeals and grievances guide
Ambetter in Texas Member grievances 1-866-683-5369 Ambetter Texas appeals and grievances guide

Notes:

  • Pharmacy prior authorization: Ambetter says it replies within 24 hours of receiving complete information, excluding weekends and holidays. An Ambetter of Illinois provider notice from 2021 also announced this number.
  • Illinois: the form (2022) lists phone 1-855-745-5507 and TDD/TTY 1-844-517-3431. Appeals are due within 180 calendar days of the denial; grievances can be filed at any time.
  • Texas: the guide (updated December 2024) gives a mailing address of Attn: Appeals Department, 5900 E Ben White Blvd., Austin, TX 78741. Members have 180 days to appeal. External review goes to MAXIMUS at fax 1-888-866-6190, within 4 months.

Other states

We could not confirm current appeals fax numbers for other Ambetter states on ambetterhealth.com, so we have not listed them. To find yours:

  1. Read your denial letter. It gives the appeals address or fax and your deadline.
  2. Check the member handbook or Evidence of Coverage for your state's plan, on ambetterhealth.com under your state.
  3. Call member services on your ID card and ask for the appeals and grievances fax.

How to fax Ambetter, step by step

  1. Identify the request: pharmacy prior authorization, appeal, or grievance.
  2. Find the number on your letter, or in the table above for your state.
  3. Complete Ambetter's form, or write a short letter explaining what you disagree with and why.
  4. Write your member ID on every page.
  5. Attach evidence: the denial, records, and any letter from your doctor.
  6. Send it in one fax and keep the confirmation.

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

Mistakes that slow down an Ambetter fax

  • Sending an appeal to the pharmacy prior authorization line. That line is for prescribers' drug requests.
  • Using another state's appeals fax.
  • No member ID on the pages.
  • Incomplete prior authorization forms. The 24-hour clock starts only when Ambetter has complete information.
  • Missing the 180-day appeal deadline.

Fax your Ambetter form now →

Frequently asked questions

What is the Ambetter prior authorization fax number?

For prescription drugs, Ambetter's Prior Authorization Request Form says to fax the completed form to (800) 977-4170. Ambetter says it replies within 24 hours of receiving complete information, not counting weekends or holidays.

What is the Ambetter appeals fax number?

It depends on the state. Ambetter of Illinois lists 1-833-886-7956 for member grievances and appeals. Ambetter in Texas lists 1-866-918-2266 for medical appeals and 1-866-683-5369 for member grievances.

How long do I have to file an Ambetter appeal?

Ambetter's Illinois form and Texas guide both give 180 days from the denial to appeal. Illinois grievances can be filed at any time.

Where do I fax an Ambetter external review in Texas?

Ambetter's Texas appeals guide says external review goes to MAXIMUS, fax 1-888-866-6190, within 4 months of the final decision.

Do I need a fax machine to send Ambetter a form?

No. An online fax service sends the form from your browser or phone and gives you a delivery confirmation.

Sources