Ambetter Fax Number: Prior Auth, Appeals & Claims

By Michael Chen · Published November 2, 2026 · 10 min read

Quick Answer: There is no single Ambetter fax number. Ambetter is sold through state plans, and each one prints its own prior authorization fax — 1-855-537-3447 in Texas, 1-855-678-6981 in Florida, 1-855-685-6508 in Georgia. Most states share 1-833-886-7956 for appeals and grievances, pharmacy appeals go to 1-888-865-6531, and claims can't be faxed at all. A practice that faxes Ambetter every week can send from its own number, with a signed BAA, on mFax Business.

An Ambetter fax number is always a state plan's fax number. "Ambetter Health is the brand name used for products and services provided by one or more of the wholly owned subsidiaries of Centene Corporation," the Ambetter Health site says, and each subsidiary runs its own authorization unit. In Texas the plan is Ambetter from Superior HealthPlan; in Michigan, Ambetter from Meridian; in Ohio, Ambetter from Buckeye Health Plan.

The state numbers below come from each state's Ambetter Quick Reference Guide, the short provider guide every state plan posts under Manuals and Forms, checked on 2026-11-13; the Texas details also draw on that state's forms and guides. Twenty-five of the guides are January 2027 editions; Delaware and New Hampshire still post January 2026 editions. Where a guide doesn't print a line, we link the state page instead of guessing.

Ambetter Fax Numbers at a Glance

The Ambetter fax number you need depends on the request type and, for authorizations and most appeals, on the member's state. Find the row, then read the section below it.

Ambetter Prior Authorization Fax Numbers by State

The Ambetter prior authorization fax number is the "Medical Fax" on the member's state guide. Each guide marks the online route — Availity Essentials and the plan's secure provider portal — as the "fastest result" for authorization requests, so fax is the alternative, not the first choice. Click a state to open the guide the numbers come from.

"Not printed" means the 2027 guide lists no behavioral health fax for that state; ask Provider Services before you fax one. Arkansas and Delaware list behavioral health authorizations by phone only.

Urgent requests go by phone

Don't fax an urgent request on its own. Every guide sends urgent authorization requests and admission notifications to the Provider Services line in the last column, and adds that "phone authorizations must be followed by a fax submission of clinical information." Inpatient hospital admissions need notification by the next business day, normal maternity deliveries excepted.

Texas: one number on the guide, another on an old form

Texas has two numbers in circulation. The October 2026 quick reference guide and the outpatient authorization form on the Texas Manuals and Forms page both print 1-855-537-3447, with behavioral health requests and records to 1-844-307-4442 and transplants to 1-833-589-1240. The inpatient authorization form still linked on the same page prints 1-866-838-7615, with records to 1-800-380-6650.

Lead with the guide's number, and confirm with Provider Services before sending an inpatient packet to the older one. Texas also sells a second Marketplace line, Ambetter Health, whose Provider Services number is 1-833-543-3145.

California and New York

Ambetter's state list sends California to Health Net's individual-plan site and New York to Fidelis Care's Ambetter page. Neither posts an Ambetter quick reference guide like the 27 above, so we don't print a number for them; use the provider section of those sites or the number on the member ID card.

Ambetter Pharmacy Fax Numbers

Drug requests go to a separate pharmacy line, not the state's medical fax. Most guides print 1-800-977-4170 as the pharmacy fax, and the Texas Pharmacy Guide calls it the "Pharmacy Services Fax." Prescribers can also file coverage determinations electronically through CoverMyMeds, the ePA route every guide lists.

A few states differ:

• Texas — the quick reference guide prints 1-866-562-8989 for pharmacy medical requests.
• South Carolina — pharmacy medical requests share the medical fax, 1-844-560-0799.
• Florida — adds a Buy and Bill drugs fax, 1-866-351-7388, and a discharge-only DME and home health fax, 1-833-422-1462.

The Texas Pharmacy Guide's coverage determination list covers non-formulary drugs, drugs with prior authorization, step therapy, quantity and age limits, and most self-injectable and infusion drugs. You'll also see 1-877-541-1503 in almost every guide; that is the fax for AcariaHealth, Ambetter's preferred specialty pharmacy, not for Ambetter itself.

Ambetter Appeal Fax Numbers

The Ambetter appeal fax number in most states is 1-833-886-7956, printed under "Appeals and Grievances" in the guides for Alabama, Arkansas, Delaware, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Michigan, Mississippi, New Jersey, North Carolina, Oklahoma, Pennsylvania, South Carolina and Tennessee. Mail goes to Ambetter, Attn: Appeals and Grievances Department, P.O. Box 10341, Van Nuys, CA 91410.

Ten states print something else:

Two appeal lines are shared across most guides. Pharmacy appeals go to 1-888-865-6531 for retail prescriptions and 1-844-235-5091 for medical-benefit drugs, or by mail to Ambetter, Attn: Pharmacy Services — Pharmacy Appeals, P.O. Box 31398, Tampa, FL 33631-3398. The Texas Pharmacy Guide allows 180 calendar days from the denial notice. Behavioral health appeals go to 1-866-714-7991.

Appealing as an Ambetter member

Members appeal to the same departments, and the denial notice says where. The federal rules on HealthCare.gov give you 180 days from the denial notice to file an internal appeal. The plan then has 30 days to decide on a service you haven't received yet, and 60 days on one you have.

Texas's Appeals and Grievances Guide (December 2024 edition) spells out the member side for that state. It allows appeals "either orally or in writing" and sends them by fax to 1-866-918-2266. A provider can appeal for the member, and anyone acting for a member needs an Appointment of Representative (AOR) form signed by both. If the denial is upheld, Texas members can ask MAXIMUS Federal Services for an external review, by fax at 1-888-866-6190. Other states describe the process in the member's Evidence of Coverage; the Georgia grievance and appeals page is an example.

Faxing your own appeal? You don't need a fax machine. Open the mFax app, upload the denial notice and your letter as a PDF, and send it in under 2 minutes, free for 7 days. On iPhone or Android, the app's scanner turns a paper notice into a fax-ready PDF.

Is There an Ambetter Claims Fax Number?

No. All 27 quick reference guides say it the same way: "Ambetter does not accept handwritten, faxed or replicated claim forms," and it doesn't accept CDs, DVDs or USB drives either. Claims go electronically or by mail:

• Electronic — through Availity, Ambetter's preferred clearinghouse, or your existing one, with payer ID 68069. Availity Essentials also offers free direct data entry.
• Paper — to Ambetter, Attn: Claims Department, P.O. Box 5010, Farmington, MO 63640-5010.

Timely filing varies by state. Most guides allow 180 days from the date of service for participating providers, and many give non-participating providers 90. Texas allows 95 days, Tennessee 90, Arizona 120 for participating providers, and Michigan 365.

In Texas, claim disputes don't go by fax either: the Claims, Disputes & Recovery Guide sends claim payment disputes "via the secure provider portal or by mail," within 120 days of the EOP. Nebraska's guide, by contrast, prints a provider dispute fax, 1-833-957-0438.

Ambetter, WellCare and Centene

Ambetter and WellCare are both Centene brands, and their fax numbers don't overlap. Ambetter covers the ACA Marketplace, while WellCare's numbers cover Medicare Advantage and prescription drug plans. The overlap is in the names: Kentucky's and New Jersey's Marketplace plans are "Ambetter from WellCare." Fax those members' requests to the Ambetter lines in the state table, and use our WellCare fax number guide only for WellCare's Medicare members.

Faxing other payers the same week? Our Aetna fax number guide and Anthem fax number guide do the same job for their lines.

How to Fax Documents to Ambetter

A fax to Ambetter lands in the right unit when you take the number from the state guide or the form, put Ambetter's identifiers on the cover sheet and keep proof of delivery. Here's the sequence in mFax, on the web or in the iPhone, Android and Windows apps:

A delivered fax proves the transmission, not that a reviewer has opened it. Check the status in Availity or the plan's portal, and keep the date, page count and receipt at hand. Our guide to the fax confirmation page explains what that proof shows.

Faxing PHI to Ambetter: What HIPAA Requires

HIPAA lets a practice fax patient records to a health plan; what it adds is a business associate agreement with the service that carries the fax. Our guide to HIPAA-compliant fax covers the rules, and how to fax PHI securely covers the habits.

mFax Business covers the service side:

• A BAA on every plan, at no extra cost. The workspace owner opens Settings, chooses Review & sign on the Business Associate Agreement row, both sides sign electronically, and the row shows Signed with the date.
• What a privacy officer asks about — PHI stored and processed in the US, a confirmed-or-failed status on every fax, and every teammate signing in with their own login.
• A fax number for Ambetter's answers. Ambetter's Texas authorization forms make the requesting provider's fax a required field. The practice's fax line puts those replies in a shared Received list.
• Fax from email, too. Staff can address a message to the fax number at send.mfax.to — the Texas medical line becomes 18555373447@send.mfax.to — and attach the PDF; the address they sign in with is already authorized. The subject and body become the cover sheet, so keep patient details in the attachment. More in our email-to-fax guide.

Plans start from about $9/mo, and you build your own from the seats and pages you need.

When a Fax to Ambetter Doesn't Go Through

When a fax to Ambetter fails, its status names the reason, and most failures can be fixed on a second try:

• Recipient busy, No answer — the line was in use or didn't pick up. Busy lines are retried automatically; otherwise wait a few minutes and press Resend.
• No fax tone, Declined — the number answered, but no fax machine did. You most likely dialed a Provider Services phone line; check the number against the guide.
• Invalid number, Number not in service — re-check the digits and the +1.
• File too large — the packet is over 60 pages or 100 MB. Split it into two faxes and mark the cover sheets "1 of 2" and "2 of 2".

Fax Ambetter from Your Practice's Own Number

mFax Business gives your practice a fax number for Ambetter's replies, HIPAA-compliant faxing with a signed BAA, and a delivery receipt for every packet — on web, mobile and desktop. Build your own plan from about $9/mo, and cancel anytime.