Mastercard's reason codes are four-digit numbers — 4853, 4837, 4808 — and while they look arbitrary, they group into clear families: fraud, authorization, point-of-interaction errors, and cardholder disputes. One code, 4853, carries the overwhelming majority of everyday consumer disputes. This guide decodes the system the way a cardholder needs it.
Type any Mastercard, Visa, Amex, or Discover reason code and get a plain-English explanation.
Unlike Visa's decimal codes, Mastercard assigns each dispute a four-digit number grouped by category:
The same complaint can carry a different code on Mastercard than it would on Visa — a not-as-described claim is usually 4853 on Mastercard but 13.3 on Visa. The numbers are not interchangeable, and each network's evidence expectations differ.
If you have exactly one Mastercard code to learn, it's 4853 — Cardholder Dispute, Defective / Not as Described. Mastercard uses it as a broad container with sub-conditions filed underneath the same number:
What this means for you: a 4853 on your letter doesn't fully tell you which of these your bank is judging. Read the letter's description carefully, match your evidence to that sub-condition (tracking records for non-provision, photos and the listing for not-as-described, cancellation confirmation for recurring), and don't assume — the three sub-cases need completely different proof.
Two related codes worth knowing: 4860 (Credit Not Processed) — the promised refund that never arrived — and 4841 (Canceled Recurring Transaction), still used alongside the 4853 sub-condition for subscription cancellations.
4855 was retired. It used to mean non-receipt of merchandise, but Mastercard folded it into 4853 as a sub-condition. If you see 4855 on an older letter, a processor export, or a training document, translate it directly: treat the dispute as a 4853 goods-or-services-not-provided case and gather the same evidence — order confirmation, promised delivery date, tracking showing non-delivery, and your messages to the merchant. Our decoder flags 4855 as retired so you know exactly what happened.
Paste your code into the decoder for the plain-English breakdown of what your bank is deciding.
This is the most consequential fork in the Mastercard system, and the one consumers most often get wrong. Fraud codes (4837, 4863) say you didn't make the transaction at all — the bank is judging authorization, and the merchant is largely defending against your issuer. Consumer-dispute codes (4853, 4841, 4860) say you made the transaction but something went wrong — now the bank is judging the facts of the purchase, and the merchant gets to present its side with delivery records, terms, and communications.
The practical difference: fraud cases turn on who (your statement of non-authorization, location proof, how fast you reported it), while consumer disputes turn on what happened (tracking, photos, the listing, dated messages to the merchant). Filing a "not as described" complaint as fraud — or vice versa — applies the wrong rulebook to your case. If your letter's code doesn't match your story, tell your issuer: the right category is worth more than the right argument in the wrong one.
Mastercard periodically retires, merges, and reorganizes codes — 4855's absorption into 4853 is the clearest example, and older lists still circulate in processor documentation. Any code list is therefore a snapshot: the authoritative source is always the exact code and description on your current bank letter. If something on your letter doesn't match, ask your issuer to explain it in writing — a precise code tells you exactly what to prove. And when in doubt about deadlines, check our Mastercard dispute time limits and the deadline calculator.
FAQ4853 is Mastercard's main consumer-dispute code — a catch-all covering goods or services not provided, not as described, defective, or a cancelled recurring charge, filed as sub-conditions under the one number. It's the code most everyday cardholder disputes travel under.
No — 4855 was retired and folded into 4853 as a sub-condition for goods-or-services-not-provided disputes. If an older letter or processor record shows 4855, treat it as a 4853 non-provision case.
Both are fraud-family codes. 4837 (No Cardholder Authorization) is the bank's determination that the transaction was unauthorized; 4863 (Cardholder Does Not Recognize) is filed when you don't recognize a charge and the bank is still treating it as possible fraud.
Mastercard uses four-digit codes (4853, 4837) while Visa uses decimal codes (13.3, 10.4). The same underlying complaint can carry a different code on each network, with different evidence expectations — the numbers are not interchangeable.
Usually not much directly — 4870 and 4871 decide which side (issuer, acquirer, or merchant) bears the loss when a chip card is processed without its chip. The consumer's job is mainly to confirm the transaction wasn't theirs.
