What American Express R13 means
The chargeback exists only because the inquiry went unanswered, intentionally or not. If you agree credit is due, Amex suggests replying by the due date with authorization for a chargeback instead.
Common causes
- Inquiry notices sent to an unmonitored email or portal
- Processor inquiry status (for example Stripe's warning_needs_response) not watched
- Reply uploaded after the due date
Evidence that answers it
- Proof you responded to the original inquiry within the time frame (submission receipt, timestamp)
- Proof of an offsetting credit
How to prevent it
- Route every Amex and processor dispute notice to one monitored queue
- Set reminders well before the 20-day reply date
- If you will not contest, reply with chargeback authorization or refund, rather than staying silent
How Verdikx helps with R13
Verdikx puts every imported dispute in one queue sorted by deadline, with 72-hour and 24-hour reminders, and Autopilot can submit inside limits you set (48 hours before the deadline by default). Forwarded notices from any processor become cases too.
Frequently asked questions
What does American Express reason code R13 mean?
Amex R13 means American Express did not receive your reply to its inquiry within the time frame, usually 20 days, or received it late. The only rebuttals are proof you replied on time or proof of an offsetting credit. Most R13 losses come from inquiries that were never noticed or routed.
Is American Express R13 worth fighting?
Our reference rates R13 (No Reply) usually one to accept: a response rarely changes the outcome. The evidence that answers it starts with proof you responded to the original inquiry within the time frame (submission receipt, timestamp). The cardholder's bank decides the outcome.
How long does a cardholder have to file a American Express R13 chargeback?
Usually 120 days from the transaction date, under the network's issuer time limits for most codes. Your processor gives you far less time to respond, so work from the due date on the case.
Answer your next R13 with the right evidence.
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Sources
- American Express: How to Manage and Help Prevent Disputes (US reference guide, version 2024PROP) (checked October 5, 2026)
- Stripe Docs: How disputes work (inquiries, timing, unchallengeable disputes) (checked October 5, 2026)
Last reviewed by Verdikx Research.