UPI error M16: AI model decline
Raised by: NPCI UPI switch. Source: NPCI, UPI Error and Response Codes v2.9.
What it means
NPCI added M16 in version 2.9 of its error-code list. It means an AI fraud model in the UPI system declined the transaction. Treat it as a newer, model-driven relative of U16.
No.
Business: the systems worked and declined the payment.
What you should do
Don't keep retrying. Make sure you're paying the right person, and contact your bank if a genuine payment keeps getting blocked.
If you run a payments business
Handle it like U16: no automatic retries, alerts on spikes, and a look at the flow that produced it.
Related codes
If it still isn't sorted
- Raise a complaint inside your UPI app. Every UPI app has a help or dispute option on the transaction, and it goes into NPCI's online dispute system. Keep the UPI transaction ID or RRN handy.
- If the app doesn't resolve it, contact your bank's grievance desk with the same reference.
- If your bank hasn't replied within 30 days, or you're not happy with the reply, complain to the RBI Ombudsman at cms.rbi.org.in. It's free.
Technical or business decline?
NPCI splits declines into two kinds. A technical decline means a system didn't respond or failed: a bank offline, a timeout, a switch error. A business decline means the systems worked and said no, for a reason about the account or the payment: wrong PIN, not enough money, a limit, a risk check. Retrying helps with some technical declines and almost never with business ones.