NSF Origin Codes:

1 = Teller posted below available balance; 
2 = Checks reversed as NSF; 
11 = ACH reversed as NSF; 
13 = NSF ATM not returned; 
16 = NSF Debit not returned; 
81 = ACH posted below available balance; 
82 = Check posted below available balance; 
83 = ATM posted below available balance; 
86 = Debit card posted below available balance.