Chargeback Reason Codes: The Complete 2026 Guide for Merchants (Visa, Mastercard, Amex, Discover)

Every chargeback you receive arrives with a reason code — a short alphanumeric label the issuing bank attaches to explain why the cardholder is disputing the transaction. The reason code is the single most important field on a dispute notification, because it dictates exactly what evidence you need to submit, how long you have to respond, and what your realistic win rate looks like.

Most merchants treat reason codes as bureaucratic noise. That's a mistake. A merchant who reads the reason code, matches the right evidence to it, and submits inside the deadline wins two to three times more disputes than one who sends a generic rebuttal. This guide walks through every category of chargeback reason code used by Visa, Mastercard, American Express, and Discover in 2026 — what each code means, the evidence that wins, and the deadlines you need to hit.

What is a chargeback reason code?

A chargeback reason code is the standardized identifier a card network assigns to a dispute when an issuing bank initiates a chargeback against a merchant. Each of the four major networks — Visa, Mastercard, American Express, and Discover — maintains its own reason code system, but all four group disputes into the same four broad categories:

• Fraud — the cardholder claims they didn't authorize the transaction
• Authorization — the merchant processed the transaction without proper authorization
• Processing errors — the transaction was processed incorrectly (wrong amount, duplicate, currency mismatch)
• Consumer disputes — the cardholder received the wrong product, no product, or believes the merchant breached the sales agreement

The reason code is generated by the issuing bank based on what the cardholder tells them. It is not always accurate — cardholders frequently mislabel disputes, and issuers sometimes assign the wrong code. Part of winning a chargeback is recognizing when the assigned reason code doesn't match the actual dispute and addressing both the stated and likely real reasons in your evidence package.

Why reason codes matter for your win rate

Card network rules are explicit: your rebuttal evidence must directly address the specific reason code on the dispute. A merchant who receives a Visa 13.1 — Merchandise/Services Not Received chargeback and submits proof the customer authorized the transaction will lose, because authorization isn't the issue. The required evidence is delivery confirmation — tracking, signature, proof of download, or proof of service rendered.

This is why generic rebuttal templates fail. The reason code tells you exactly what the issuer's compelling evidence requirements are, and submitting anything else is wasted work. Merchants who automate reason-code-matched evidence collection routinely hit 60–75% win rates on first chargebacks; merchants using generic responses average 20–30%.

Visa chargeback reason codes (Visa Claims Resolution)

Visa restructured its dispute system into the Visa Claims Resolution (VCR) framework in 2018, consolidating dozens of legacy reason codes into four categories with two-part numeric codes (e.g. 10.4, 13.1).

### Visa fraud reason codes (Category 10)

• 10.1 EMV Liability Shift — Counterfeit Fraud — a counterfeit card was used at a non-EMV terminal. Almost always a card-present issue.
• 10.2 EMV Liability Shift — Non-Counterfeit Fraud — a lost or stolen EMV chip card was used at a non-chip terminal.
• 10.3 Other Fraud — Card Present — fraudulent card-present transaction outside the EMV liability shift.
• 10.4 Other Fraud — Card Absent — the most common ecommerce fraud chargeback. Cardholder claims they didn't make the online purchase. Defendable with AVS/CVV match, device fingerprint, customer-account history, IP geolocation matching shipping address, and prior legitimate purchases.
• 10.5 Visa Fraud Monitoring Program — the merchant has been placed in Visa's fraud monitoring program. These are not individually rebuttable.

### Visa authorization reason codes (Category 11)

• 11.1 Card Recovery Bulletin — the merchant processed a transaction on a card listed in Visa's Card Recovery Bulletin.
• 11.2 Declined Authorization — the merchant forced through a transaction that was declined.
• 11.3 No Authorization — the merchant processed without obtaining an authorization at all.

### Visa processing error reason codes (Category 12)

• 12.1 Late Presentment — the transaction was submitted past Visa's clearing window.
• 12.2 Incorrect Transaction Code — wrong transaction code submitted.
• 12.3 Incorrect Currency — wrong currency code.
• 12.4 Incorrect Account Number — account number doesn't match.
• 12.5 Incorrect Amount — billed amount differs from authorized amount.
• 12.6 Duplicate Processing/Paid by Other Means — the cardholder was charged twice, or paid by cash/check and was also charged on the card.
• 12.7 Invalid Data — required transaction data is missing or invalid.

### Visa consumer dispute reason codes (Category 13)

• 13.1 Merchandise/Services Not Received — the product or service was never delivered. Defendable with tracking, delivery confirmation, signed proof of delivery, or proof of digital fulfillment.
• 13.2 Cancelled Recurring — the cardholder cancelled a subscription but was billed anyway. Defendable with timestamped cancellation records and clear billing policy.
• 13.3 Not as Described or Defective Merchandise — product doesn't match description. Defendable with product description screenshots, return policy, customer service correspondence, and proof the customer didn't return the item.
• 13.4 Counterfeit Merchandise — cardholder claims they received counterfeit goods.
• 13.5 Misrepresentation — merchant misrepresented the product or service.
• 13.6 Credit Not Processed — merchant agreed to refund but didn't issue it. Defendable with proof of credit issued and policy disclosure.
• 13.7 Cancelled Merchandise/Services — cardholder cancelled inside the merchant's cancellation window but was charged.
• 13.8 Original Credit Transaction Not Accepted — refund was rejected.
• 13.9 Non-Receipt of Cash or Load Transaction Value — applies to prepaid load disputes.

Visa response deadline: merchants have 30 days from the chargeback date to submit second-presentment evidence under VCR.

Mastercard chargeback reason codes

Mastercard uses four-digit codes grouped into the same four categories.

### Mastercard fraud reason codes

• 4837 No Cardholder Authorization — the most common Mastercard fraud chargeback. Cardholder denies authorizing the transaction. Defendable with AVS/CVV, device data, IP match, customer history.
• 4840 Fraudulent Processing of Transactions — multiple disputed transactions on one card.
• 4849 Questionable Merchant Activity — Mastercard flagged the merchant.
• 4863 Cardholder Does Not Recognize — Potential Fraud — common "I don't recognize this charge" claim. Often friendly fraud. Defendable with clear billing descriptor, IP/device match, customer-account proof, and order history.
• 4870 Chip Liability Shift — non-EMV terminal processed a chip card.
• 4871 Chip/PIN Liability Shift — lost/stolen PIN-preferred card.

### Mastercard authorization reason codes

• 4808 Authorization-Related Chargeback — covers expired authorizations, declined authorizations processed anyway, and missing authorizations.
• 4812 Account Number Not on File — the account doesn't exist.

### Mastercard processing error reason codes

• 4831 Transaction Amount Differs — billed amount doesn't match authorized.
• 4834 Duplicate Processing — transaction processed more than once.
• 4842 Late Presentment — transaction submitted past deadline.
• 4846 Correct Transaction Currency Code Not Provided — wrong currency.
• 4850 Installment Billing Dispute — installment plan dispute.

### Mastercard consumer dispute reason codes

• 4853 Cardholder Dispute — the umbrella code for goods/services issues. Sub-conditions cover not received, not as described, defective, credit not processed, cancelled recurring, and digital goods disputes.
• 4854 Cardholder Dispute — Not Elsewhere Classified (US Only) — US-only catch-all.
• 4855 Goods or Services Not Provided — non-delivery.
• 4859 Service Not Rendered — service-based non-delivery.
• 4860 Credit Not Processed — refund not issued.

Mastercard response deadline: 45 days for most reason codes, 60 days for installment billing disputes.

American Express chargeback reason codes

American Express is both the network and the issuer for most of its cards, so its reason codes work slightly differently. Codes are alphanumeric (e.g. F24, A02, C08).

### Amex fraud codes (F-series)

• F14 Missing Signature — card-present without signature.
• F24 No Cardmember Authorization — Amex's primary ecommerce fraud code. Equivalent to Visa 10.4 / Mastercard 4837.
• F29 Card Not Present — disputed card-not-present transaction.
• F30 EMV Counterfeit — counterfeit card at non-EMV terminal.
• F31 EMV Lost/Stolen/Non-Approved — lost/stolen EMV card.

### Amex authorization codes (A-series)

• A01 Charge Amount Exceeds Authorization Amount
• A02 No Valid Authorization
• A08 Authorization Approval Expired

### Amex processing error codes (P-series)

• P01 Unassigned Card Number
• P03 Credit Processed as Charge
• P04 Charge Processed as Credit
• P05 Incorrect Charge Amount
• P07 Late Submission
• P08 Duplicate Charge

### Amex consumer dispute codes (C-series)

• C02 Credit Not Processed — refund not issued.
• C04 Goods/Services Returned or Refused — customer returned the product and wasn't refunded.
• C05 Goods/Services Cancelled — order cancelled in time but charged.
• C08 Goods/Services Not Received or Only Partially Received — non-delivery.
• C14 Paid by Other Means — customer paid in another way.
• C18 No Show or CARDeposit Cancelled — hotel/rental no-show dispute.
• C28 Cancelled Recurring Billing — subscription cancelled but billed.
• C31 Goods/Services Not as Described
• C32 Goods/Services Damaged or Defective

Amex response deadline: 20 days — the shortest of any network. Set up automated alerts.

Discover chargeback reason codes

Discover uses two-letter codes grouped into the same four categories.

### Discover fraud codes

• UA01 Fraud — Card Present Transaction
• UA02 Fraud — Card Not Present Transaction — equivalent to Visa 10.4.
• UA05 Fraud — Chip Counterfeit Transaction
• UA06 Fraud — Chip and PIN Transaction

### Discover authorization codes

• AT Authorization Noncompliance

### Discover processing error codes

• IC Illegible Sales Data
• LP Late Presentation
• DP Duplicate Processing
• NA No Authorization

### Discover consumer dispute codes

• RG Non-Receipt of Goods or Services
• RM Cardholder Disputes Quality of Goods or Services
• RN1 Credit Not Processed
• RN2 Credit Posted as Purchase
• CD Credit/Debit Posted Incorrectly

Discover response deadline: 30 days for most codes.

Evidence that wins each reason code category

Match your evidence package to the reason code category. Submitting the wrong type of evidence is the single most common reason chargebacks are lost.

For fraud codes (Visa 10.4, MC 4837/4863, Amex F24, Discover UA02):

• AVS and CVV match results
• IP address geolocated to shipping/billing region
• Device fingerprint matching previous legitimate orders
• Customer-account history (signup date, prior orders, login records)
• Delivery confirmation to the verified billing address
• Communication history showing customer engagement
• 3D Secure authentication results when available

For non-delivery codes (Visa 13.1, MC 4855, Amex C08, Discover RG):

• Tracking number with carrier-confirmed delivery
• Signed proof of delivery (signature image)
• Delivery photo if carrier provides one
• For digital goods: download/access logs with timestamps and IP
• For services: appointment confirmations, login records, usage data

For not-as-described codes (Visa 13.3, MC 4853, Amex C31, Discover RM):

• Product description and images from the time of purchase
• Customer service correspondence
• Return policy disclosed at checkout
• Proof customer did not return the item
• Quality control documentation if applicable

For cancelled recurring codes (Visa 13.2, MC 4853 cancelled subscription, Amex C28):

• Subscription terms accepted at signup (timestamped)
• Clear cancellation instructions in customer-facing UI
• Records of all cancellation attempts (or absence of any)
• Email/SMS reminders sent before each billing

For credit not processed codes (Visa 13.6, MC 4860, Amex C02, Discover RN1):

• Proof of refund issued (transaction ID, date, amount)
• Refund policy disclosed at checkout
• Communication confirming refund was processed

Response deadlines at a glance

| Network | Standard deadline | Notes | |---|---|---| | Visa | 30 days | VCR auto-closes at the deadline | | Mastercard | 45 days | 60 days for installments | | American Express | 20 days | Shortest window | | Discover | 30 days | Some codes shorter |

Miss the deadline and you forfeit the dispute automatically — no exceptions, no appeals.

Frequently asked questions

### What is the most common chargeback reason code? Across all networks, card-not-present fraud (Visa 10.4, Mastercard 4837/4863, Amex F24, Discover UA02) is the most common reason code for ecommerce merchants. The majority of these are friendly fraud — a real customer disputing a real purchase — not true criminal fraud.

### Can I dispute the reason code itself? You can't change the reason code on a chargeback, but in your rebuttal you can argue that the issuer assigned the wrong code and present evidence addressing what the dispute actually is. This is especially common with "cardholder doesn't recognize" codes that are really delivery or quality disputes in disguise.

### What happens if I miss the response deadline? The chargeback is automatically won by the cardholder. You forfeit the disputed amount, the chargeback fee (typically $15–$100), and you cannot appeal. The chargeback also counts against your monthly chargeback ratio.

### Do all card networks use the same reason codes? No. Visa, Mastercard, Amex, and Discover each maintain their own reason code systems, though they all group disputes into the same four categories: fraud, authorization, processing errors, and consumer disputes. The required evidence is broadly similar within each category across networks.

### Which reason codes are easiest to win? Processing error codes (duplicate charges, wrong amounts, late presentment) are easiest to win when the merchant has clean records, because they're factual disputes. Non-delivery codes are highly winnable with tracking and signed delivery proof. Friendly fraud codes (10.4, 4863, F24) are winnable but require a comprehensive evidence package. True criminal fraud (lost/stolen card, EMV liability shift) is almost never winnable.

### How long does it take to win a chargeback? After you submit evidence, the issuing bank typically takes 30–75 days to review and decide. If they reject your evidence, you can escalate to pre-arbitration and arbitration, which can extend the process to 6+ months.

The bottom line

Reason codes are not paperwork — they are the playbook. Every dispute tells you exactly which evidence will win it, and every network publishes its compelling evidence requirements in plain language. Merchants who match reason-code-specific evidence to every dispute and submit inside the deadline routinely win 60% or more of their chargebacks. Merchants who don't usually win under 25%.

RecovraFlow reads the reason code on every incoming dispute, pulls the matching evidence from your store and payment processor, and assembles a rebuttal package mapped to that network's compelling evidence requirements — all before the response deadline. If you're handling more than a handful of chargebacks a month, automated reason-code-matched evidence is the fastest way to lift your win rate without hiring a dispute team.