Mastercard Chargeback Reason Code
Mastercard Reason Code 4849: Questionable Merchant Activity
Category FraudBy Payment Defender Editorial TeamUpdated July 17, 2026Last reviewed July 17, 2026
QMAP and applicable coercion-program context
What Mastercard Reason Code 4849 Means
Mastercard reason code 4849 identifies a dispute tied to questionable merchant activity, typically raised when a merchant is identified through a Mastercard fraud or compliance program such as the Questionable Merchant Audit Program.
Why This Chargeback Happens
This dispute commonly occurs when a merchant appears in a Mastercard risk or compliance program, when transactions are linked to identified fraud patterns, or when program-level review flags the merchant's activity.
What the Cardholder or Issuer Is Claiming
Mastercard or the issuer is asserting that the transaction is connected to questionable merchant activity identified through an applicable program.
What Merchants Should Review
Review any program notifications received, the flagged transaction details, your fraud-screening records, and communications from your acquirer regarding program placement.
Recommended Chargeback Evidence
- Records demonstrating legitimate, well-documented transactions
- Fraud-screening and authentication results for the flagged sales
- Correspondence with your acquirer about program status
- Documentation of remediation steps taken to reduce fraud
How to Prevent Similar Disputes
Questionable-activity disputes may be reduced by maintaining strong fraud controls, monitoring fraud ratios against program thresholds, cooperating promptly with acquirer inquiries, and documenting remediation when concerns are raised.
Important Limitations
This page is educational and reflects common industry usage. Mastercard dispute rules, timelines, and evidence requirements change over time and vary by region, program, and dispute reason. Merchants should confirm current requirements with their acquirer or processor before responding to any dispute.
Relevant Payment Defender Products
AlertBridge™
AlertBridge™ may help merchants intercept fraud disputes as alerts before they become chargebacks.
Explore AlertBridge™
Related Reason Codes
Sources and Review Information
- Mastercard: Mastercard Chargeback Guide
Last reviewed July 17, 2026
Chargeback rules, evidence requirements, and response options may vary by card network, region, processor, and dispute circumstances.