Amex Chargeback Reason Codes: What They Mean and What to Do

Who this helps: an Amex inquiry or chargeback just landed, you are looking at a code like C28 or F29, and you need to know what it means and what to send back before the clock runs out.

A Visa dispute travels from the customer to their bank, through the card network and your processor, before it reaches you. An Amex dispute skips most of that: for most Amex cards, American Express is the bank and the network, so the claim comes straight from them, on a short clock. Here is every code and what it asks for.

How is an Amex dispute different from Visa or Mastercard?

The parties are different, and so is the first step. American Express issues most of the cards that carry its name, so for those there is no separate bank in the middle. Some Amex-branded cards are issued by partner banks, and those can behave differently. Amex tries to settle the claim with the customer first, and if that fails, you see it one of two ways.

An inquiry means Amex needs your help before deciding, and no money has moved. An upfront chargeback means Amex decided it already has enough to act, and your account is debited straight away. The Amex guide is blunt about the deadline for both: "YOU HAVE 20 DAYS TO RESPOND."

Two more limits are worth knowing. Customers have up to 120 days from the transaction date to dispute a charge, though the window differs for goods not received, returns and cancellations. And Amex caps the same charge at "just 2 disputes per charge in most cases."

What are the Amex chargeback reason codes?

There are 34 American Express chargeback reason codes, sometimes called Amex dispute reason codes, and Amex sorts them into five groups: authorization, Card Member disputes, fraud, processing errors, and inquiry or miscellaneous. The group matters more than the code itself, because it tells you which evidence answers the claim. Our Visa and Mastercard code guide covers the other two networks.

Amex also runs a separate list of 18 inquiry codes, the ones you see before any money moves. They cover the same complaints at an earlier stage, which is the stage worth caring about.

Every Amex chargeback code, A to Z

Jump to the codes subscriptions get most: C28, F29, C08, C31.

Which Amex codes hit subscription businesses?

Four, and the first one accounts for most of them.

C28, canceled recurring billing. Amex's full name for it is longer, because it also covers goods not as described, defective or damaged, but for a subscription business it is the cancellation code. Amex's own list of what causes it reads like a list of subscription mistakes: the cancellation has not been processed yet, a promised refund was never issued, the customer was billed before the credit posted, the customer did not understand the renewal terms, the cancellation came after the automatic renewal, the customer tried to cancel and could not, or the charge was for an introductory offer. Amex asks for your cancellation policy, proof of how you disclosed it, and for trials, the customer's express consent to the terms plus a written confirmation when they signed up. This is the Amex twin of Visa 13.2 and Mastercard 4841.

F29, card not present. The customer denies taking part in a charge made without the card. For a subscription business this is usually the unrecognized rebill rather than a stolen card. Worth knowing: Amex states F29 does not apply to transactions started inside a digital wallet app.

C08, not received. The customer says the service never arrived, or only partly did. Failed provisioning after a successful payment lands here.

C31, not as described. The customer says what they got differs from the written description at the time of the charge. For software, that is the gap between the landing page and the product.

What happens if you miss the 20 days?

You lose, and Amex has codes for it. R13 is "No Reply" and R03 is "Insufficient Reply." Both are chargebacks created by the response rather than by the original complaint, which makes them the easiest ones on the list to avoid and the most annoying ones to receive.

The practical version: treat an Amex inquiry as a same-week task. Stripe warns that an unanswered inquiry can escalate into a chargeback you cannot win, and on Amex that escalation has its own code waiting for it.

What are FR2, FR4 and FR6?

They are programs, not complaints, and they remove your right to argue. FR2 is the Fraud Full Recourse Program, FR4 the Immediate Chargeback Program and FR6 the Partial Immediate Chargeback Program. When your Amex merchant account is enrolled in one, a customer's claim becomes a chargeback automatically.

The only defenses Amex lists are proof that you were not enrolled at the time, or proof that a credit already offsets the charge. Amex's own advice for staying out is short: issue credits and refunds within 7 calendar days, and state your refund time frames clearly.

Do chargeback alerts cover Amex?

Barely, and it matters more here than on other networks. Because Amex issues most of its own cards, the alert networks reach Amex disputes only where a participating bank is involved, and both Verifi's CDRN and Ethoca need a separate enrollment for it. Our alerts page states the same thing.

So on Amex, the two things that work are the ones you control: prevent the dispute with a recognizable statement line, an easy cancel and a reminder before every renewal, and answer every inquiry inside 20 days. The prevention playbook covers the first; the calendar covers the second.

One piece of good news: Visa's VAMP counts Visa's own fraud reports and disputes, and Mastercard's ECP counts Mastercard chargebacks, so an Amex dispute sits outside both. Amex's consequences are its own, and they arrive as the FR programs.

FAQ

Facts checked against American Express's US disputes reference guide and Stripe's documentation on dispute reason codes and how disputes work. Last reviewed September 16, 2026.