American Express Chargeback Reason Codes

Updated June 2026

American Express chargeback reason codes are letter-and-number codes (such as F29, C08, and C31) that tell you exactly what a cardholder is disputing. Because Amex is a closed-loop network (both the card issuer and the network), its codes and dispute process differ from Visa and Mastercard. The most important difference for merchants: Amex usually gives you about 20 days to respond, the shortest window of any major network, and many disputes start as an inquiry you can resolve before it becomes a chargeback.

How the Amex dispute process works

American Express handles disputes differently because it issues its own cards. Many disputes begin as an inquiry (a request for information) rather than an immediate chargeback. If you provide complete evidence at the inquiry stage, the dispute can close before any funds move. When a claim is clear-cut, Amex may instead issue an upfront chargeback and give you a chance to respond (represent the charge).

Treat every inquiry as urgent. If you do not respond, or your response is incomplete, the inquiry can turn into a chargeback and the funds are debited.

Common Amex chargeback reason codes

American Express groups its reason codes by dispute type. These are among the codes merchants see most often. Always confirm the exact code and its current evidence requirements in your Amex merchant portal or processor dashboard, since networks update their dispute rules over time.

Code	What the cardholder is claiming	Evidence that answers it
F29	Card not present: disputes an online or phone charge as fraudulent	AVS/CVV match, authentication data, IP and device records, delivery to the cardholder
C08	Goods or services not received, or only partially received	Tracking with delivery confirmation, or access/usage logs for digital goods and services
C31	Goods or services not as described	Listing screenshots, specifications, and any return process the customer skipped
C28	Canceled recurring billing: charged after the cardholder says they canceled	Consent to recurring terms, your cancellation policy, the date and method of any cancellation request
C02	Credit not processed: a promised refund did not appear	Refund receipt and date, or your policy showing no refund was owed

For per-code detail, see our reason code library, which includes Amex codes such as F29, C08, and C31.

The 20-day deadline: respond fast

American Express gives merchants roughly 20 days to respond, measured from the inquiry or chargeback date. That is the strictest deadline among Visa, Mastercard, and Discover. Build your evidence as soon as the notice arrives rather than waiting. For a side-by-side of every network's timeline, see our chargeback response deadlines guide.

Miss the window and the dispute is upheld. Amex's short timeline leaves little room for delay, so set an alert for new disputes and aim to respond within the first week.

How to respond to an Amex reason code

Match your evidence to the specific code rather than sending a generic packet. Amex acts as both network and issuer, so it can already see cardholder data, and inconsistencies are more likely to be noticed. Keep your response accurate, concise, and organized.

Read the code, then build to it

Identify the exact reason code and gather only the evidence that disproves that claim: delivery confirmation for C08, authentication data for F29.

Answer inquiries completely the first time

Because an incomplete inquiry response can become a chargeback, include everything the code requires in your first reply.

Keep it factual

A short cover explanation plus labeled exhibits reads better than a long, argumentative letter. No service can guarantee a win, but a clear, code-specific response gives you the best chance.

Frequently Asked Questions

How long do I have to respond to an American Express chargeback?↓

American Express generally gives merchants about 20 days, measured from the inquiry or chargeback date, which is the shortest window of the major card networks. If you do not respond in time, an inquiry can turn into a chargeback and the funds stay debited.

What is the difference between an Amex inquiry and a chargeback?↓

An inquiry is Amex requesting information before deciding whether to charge it back. A chargeback means the funds have already been debited. Responding fully at the inquiry stage can resolve the dispute before it becomes a chargeback, so treat inquiries as urgent.

Why does American Express have different reason codes than Visa and Mastercard?↓

American Express runs a closed-loop network: it is both the card issuer and the network. Visa and Mastercard are open-loop, with separate banks issuing the cards. Because Amex plays both roles, it uses its own letter-and-number codes (like C08, C31, and F29) and its own dispute process.

What are the most common Amex chargeback reason codes?↓

Common American Express reason codes include F29 (card not present fraud), C08 (goods or services not received), C31 (not as described), C28 (canceled recurring billing), and C02 (credit not processed). Each calls for evidence tailored to that specific claim.

Respond to an Amex Dispute in Time

With only ~20 days to respond, speed matters. ChargebackKit builds a code-specific evidence pack with a response letter and organized exhibits, so you can answer the inquiry or chargeback quickly.

Build My Evidence Pack — $19

Or see a sample pack first →