A chargeback reason code is the short alphanumeric label a card network attaches to a disputed transaction to tell the merchant exactly what the cardholder is claiming went wrong. Visa, Mastercard, American Express, and Discover each run their own numbering system, but every chargeback reason code sorts into one of four buckets: fraud, authorization failures, processing errors, or consumer complaints about the goods or services. The code controls what evidence you need to fight the dispute and how many days you have to send it.
The Four Categories Every Code Falls Into
Despite the different numbering schemes, every major network organizes its codes around the same four categories.
Fraud codes cover transactions the cardholder says they never made or authorized. Authorization codes flag sales processed without proper approval from the issuing bank, or processed after a decline. Processing error codes deal with mechanical mistakes: duplicate charges, wrong amounts, late submission of transaction records. Consumer dispute codes address complaints about the purchase itself — merchandise that never arrived, services that didn’t match what was promised, or refunds the merchant agreed to but never issued.
Which category a code sits in tells you who has to prove what. Fraud puts the burden on the merchant to show the real cardholder made the purchase. Processing errors turn on transaction records and timestamps. Consumer disputes come down to delivery confirmation, product descriptions, and refund records. Identifying the category is the first step in deciding whether a dispute is worth fighting.
Visa Reason Codes
Visa uses a decimal system that groups every code into one of four numbered categories, with the decimal identifying the specific claim. The Visa Core Rules and Visa Product and Service Rules set out the full list and the evidence each code requires.1Visa. Visa Core Rules and Visa Product and Service Rules
- Category 10 — Fraud. The cardholder says they did not make or authorize the charge. Code 10.4 covers fraud in card-not-present transactions and is the most common fraud code online merchants see.
- Category 11 — Authorization. The merchant processed without a valid approval, or kept processing after a decline response.
- Category 12 — Processing Errors. Duplicate charges, incorrect amounts, late presentment, and similar settlement mistakes.
- Category 13 — Consumer Disputes. Goods not received, goods not as described, or a refund that was promised but never posted. Code 13.1 is the non-receipt code.
The decimal is what tells you precisely what the cardholder alleged, and that is what dictates the documentation you need to submit.
Mastercard Reason Codes
Mastercard uses a four-digit numbering scheme in the 48xx series, mapped to the same four conceptual buckets. The Mastercard Chargeback Guide sets out the specific evidence requirements for each code.2Mastercard. Chargeback Guide Merchant Edition
- Code 4837 — No Cardholder Authorization. Mastercard’s primary fraud code, with a heavy evidentiary burden.
- Code 4808 — Authorization-Related. Processing without proper authorization, including ignoring a decline.
- Code 4834 — Point-of-Interaction Error. Terminal and processing problems, including duplicate charges and incorrect currency conversion.
- Code 4853 — Cardholder Dispute. The broadest code, covering goods not received, goods not as described, defective merchandise, and credits never processed.
Some systems show these codes as two digits (37, 08, 34, 53). They mean the same thing. If you see a two-digit Mastercard code, prefix it with “48” and the documentation requirements line up.2Mastercard. Chargeback Guide Merchant Edition
American Express Reason Codes
American Express is both the card network and the issuing bank, which changes how its disputes flow. AmEx uses a two-phase process: an initial inquiry stage, where the network requests information from the merchant, and a formal dispute if the inquiry response doesn’t resolve the issue.3American Express. Managing a Dispute Case
AmEx reason codes use letter prefixes that signal the category. Codes starting with “F” relate to fraud claims. Codes starting with “C” cover credit-related issues such as refunds the cardholder says were never processed. Because there is no separate issuing bank in the middle, the merchant’s dealings with the dispute are more direct than on Visa or Mastercard.
Discover Reason Codes
Discover uses a four-digit numeric system spread across several ranges rather than concentrated in one series. Fraud codes include 4537 for card-present fraud, 4752 for a cardholder who doesn’t recognize the charge, and 4868 for card-not-present fraud. Authorization issues use codes such as 4512 for an invalid cardholder number. Processing errors include 4534 for duplicate charges and 4542 for late presentment.4Adyen Docs. Dispute Reason Codes and Defense Requirements
Consumer disputes carry their own codes. 4541 flags unauthorized recurring charges the cardholder says they already canceled. 4553 covers quality complaints about goods or services. 4555 addresses non-receipt. 4560 handles credits a merchant agreed to issue that never appeared on the cardholder’s account.4Adyen Docs. Dispute Reason Codes and Defense Requirements
Friendly Fraud Hides Inside Fraud Codes
A fraud reason code does not necessarily mean a stolen card. The industry distinguishes true fraud from what Visa calls “first-party misuse,” commonly known as friendly fraud. True fraud is a stranger using stolen credentials. Friendly fraud is the actual cardholder, or someone in their household, making the purchase and then disputing it anyway.5Visa. Friendly Fraud Explained: Prevention and Solutions
Friendly fraud lands under the same fraud reason codes as genuine stolen-card cases. A family member used a saved card. The cardholder didn’t recognize the merchant’s billing descriptor. The buyer wants to keep the goods without paying. The reason code alone will not tell you which situation you are in, which is why the evidence rules under codes like Visa 10.4 give merchants a specific path to prove the cardholder actually made the purchase.
How to Find the Reason Code on a Dispute
When a chargeback comes in, pull three pieces of information before doing anything else: the reason code, the Acquirer Reference Number (ARN), and the original transaction date and amount. The reason code tells you what is being claimed. The ARN, a unique 23-digit identifier, lets you track the funds and match the dispute to your sale records. The transaction date and amount let you pull up the specific order in your own system.
Most of this information appears on a Chargeback Adjustment Report or Debit Advice from your payment processor. These are the formal notification that funds have been withdrawn from your merchant account. The processor’s online portal is usually the fastest route — look under “Disputes,” “Chargebacks,” or “Reporting.” Stripe, for example, surfaces disputes in the main dashboard and offers automated evidence collection for eligible cases.6Stripe. Disputes Clicking into a specific case shows the network’s reason code, a description of the claim, and the response deadline.
Once you have the code, cross-reference it against the network’s own documentation to confirm what evidence qualifies. A generic response that doesn’t address the specific code is functionally the same as no response at all.
Response Deadlines by Network
Missing a response deadline is the fastest way to lose a chargeback you could have won. The clock starts when the dispute is filed, not when you notice it in your dashboard.
Visa gives merchants 30 days to respond at the initial dispute and pre-arbitration stages. Arbitration drops that to 10 days.
Mastercard allows 45 calendar days from the chargeback settlement date for the initial representment. Supporting documentation then has to be uploaded to Mastercom within 8 calendar days of generating the representment (10 days for Maestro). Miss the documentation window and Mastercard will not consider the evidence even if the representment itself was timely.7Mastercard. Chargeback Guide Merchant Edition
American Express does not publish a universal deadline. Each dispute carries a “reply-by” date in the merchant dispute dashboard. Miss it and AmEx issues the chargeback automatically.3American Express. Managing a Dispute Case Discover generally allows 30 days.
Across every network, the safest practice is to check the processor’s dispute portal daily or set up automated alerts.
Matching Evidence to the Code
The reason code dictates what counts as acceptable evidence. A fraud code wants proof the real cardholder made the purchase. A non-receipt code wants proof of delivery. Submitting the wrong type of evidence, or generic evidence that doesn’t address the specific code, is why merchants lose disputes they should win.
Visa Compelling Evidence 3.0
Visa built Compelling Evidence 3.0 (CE3.0) specifically to help merchants fight friendly fraud under dispute condition 10.4. To qualify, the merchant must provide at least two previous undisputed transactions from the same cardholder that occurred between 120 and 365 days before the dispute, with no fraud reports against them.8Visa. Compelling Evidence 3.0 Merchant Readiness
The heart of CE3.0 is data matching. At least two of the following must match between the disputed transaction and the historical ones: user account or login ID, IP address, shipping address, or device ID/fingerprint. At least one of those two matches has to be either the IP address or the device ID. Showing that the same device from the same IP address made undisputed purchases six months earlier is a strong signal of friendly fraud.9Visa. Evolution of Compelling Evidence – Merchant FAQs
Mastercard Evidence Standards
Mastercard’s requirements vary by subcategory. For a 4853 dispute claiming goods were not as described, the issuer has to show the cardholder contacted the merchant and the merchant refused to resolve the problem. The merchant can defend with documentation that goods were delivered as described or that the cardholder acknowledged receipt in good condition. For digital goods purchases of $25 or less, the bar is lower: the merchant can show that purchase controls were offered or that a refund was already issued.10Mastercard. Chargeback Guide Merchant Edition
All Mastercard supporting documentation goes through Mastercom. If the issuer and merchant operate in different languages, the merchant must include an English translation of any relevant document.10Mastercard. Chargeback Guide Merchant Edition
What Happens if You Lose the First Round
A rejected representment is not necessarily the end. On Mastercard, the next step is pre-arbitration: the issuer files a pre-arbitration case explaining why it rejected the evidence, and the acquirer has 30 calendar days to respond. The acquirer can accept the loss, reject the case with a new rebuttal, or do nothing (which counts as accepting the loss after 30 days). If the issuer is still unsatisfied, it can escalate to full arbitration, where Mastercard’s Dispute Resolution Management team assigns financial liability. The losing party has 45 calendar days to appeal, and arbitration carries an administrative fee on top of the original chargeback amount.11Mastercard. Chargebacks Made Simple Guide
Visa follows a similar path: dispute response, pre-arbitration (30 days each), then arbitration (10 days). Each stage shortens the response window and raises the stakes. Weak evidence at the initial representment stage only gets weaker on appeal.
Why Your Overall Chargeback Rate Matters
Card networks track your chargeback rate over time. Even if you win most individual disputes, exceeding network thresholds triggers monitoring programs with escalating penalties.
Visa’s Acquirer Monitoring Program (VAMP) uses a dispute ratio combining fraud and non-fraud chargebacks against total transaction volume. A merchant has to hit at least 1,500 disputes to be flagged, and once that floor is met, the ratio drives the classification. As of April 2026, Visa classifies merchants as “excessive” at a dispute ratio of 1.5% or higher in most regions, down from the previous 2.2% threshold. Acquirers face their own thresholds, with ratios above 0.5% considered “above standard” and above 0.7% “excessive.”
Mastercard’s Excessive Chargeback Program (ECP) uses both a count and a ratio against the prior month’s sales. A merchant hitting 100 or more chargebacks at a ratio between 1.5% and 2.99% is classified as an Excessive Chargeback Merchant. At 300 or more chargebacks with a ratio of 3% or higher, the classification escalates to High Excessive Chargeback Merchant with steeper penalties. Exiting the program requires staying below the lower thresholds for three consecutive months.
The worst outcome is termination by the acquiring bank and placement on Mastercard’s MATCH list (Member Alert to Control High-Risk Merchants), a shared database other acquirers check before onboarding new merchants. A MATCH listing lasts five years and makes finding a new processor during that period very difficult.12Mastercard Developers. MATCH Pro Managing chargeback reason codes is not only about winning the case in front of you. It is about keeping the aggregate numbers low enough that these programs never flag you in the first place.