Change files

A Notification of Change (NOC) is a non-dollar entry transmitted from a receiving depository financial institution (RDFI) to the originating depository financial institution (ODFI). These are sent in response to outdated or erroneous information in an initial entry. An NOC often occurs due to bank mergers or acquisitions that change account and/or routing numbers. If an RDFI sends an NOC, the ODFI will need to inform their originator promptly.

The Standard Entry Class code for an NOC is “COR”. There are a few possible reasons for an NOC, each defined by a “change code”. The most common codes are C01 for an incorrect account number and C02 for an outdated routing number. We have a list of supported change codes below.

NOCs are identified by an Addenda98 record on the EntryDetail with a ChangeCode that can be processed.


The RDFI must send an NOC within two banking days of the original entry settlement date (to which the NOC is in response to).

The ODFI is responsible for forwarding an NOC to the Originator within two banking days of the NOC settlement date. They must provide the Originator with the following information at a minimum:

  • Company name
  • Company identification
  • Company Entry description
  • Effective Entry date
  • DFI account number
  • Individual name/receiving company name
  • Individual identification number

  • Change code
  • Original Entry trace number
  • Original RDFI indentification
  • Corrected data

The Originator must make specified changes within six banking days of receiving the above information or prior to initiating another entry to the receiver’s account (whichever is later).


When creating an NOC entry, add an Addenda98 record onto the EntryDetail with the appropriate change code.

addenda98 := ach.NewAddenda98()
addenda98.ChangeCode = "C01"
addenda98.OriginalTrace = "121042880000001"
addenda98.OriginalDFI = "121042882"
addenda98.CorrectedData = "1918171614"
addenda98.TraceNumber = "91012980000088"

//entry.Addenda98 = addenda98

Change codes

Code Reason Description
C01 Incorrect bank account number Bank account number incorrect or formatted incorrectly
C02 Incorrect transit/routing number Once valid transit/routing number must be changed
C03 Incorrect transit/routing number and bank account number Once valid transit/routing number must be changed and causes a change to bank account number structure
C04 Bank account name change Customer has changed name or ODFI submitted name incorrectly
C05 Incorrect payment code Entry posted to demand account should contain savings payment codes or vice versa
C06 Incorrect bank account number and transit code Bank account number must be changed and payment code should indicate posting to another account type (demand/savings)
C07 Incorrect transit/routing number, bank account number and payment code Changes required in three fields indicated
C09 Incorrect individual ID number Individual’s ID number is incorrect
C10 Incorrect company name Company name is no longer valid and should be changed
C11 Incorrect company identification Company ID is no longer valid and should be changed
C12 Incorrect company name and company ID Both the company name and company id are no longer valid and must be changed