A 1099-R form uses a variety of numbered and lettered codes to indicate the type of distribution. They are entered in Box 7 on the form. A table of the codes is included in the instructions.
This form was new for 2020 and replaces the old Box 7 of Form 1099-MISC. “NEC” stands for “non-employee compensation”. It is due to recipients and the IRS by January 31st (or the first ...
When one of these exceptions applies, your IRA custodian is required to indicate the exception by entering the appropriate exception-qualifying code in Box 7 Distribution code(s) of your 1099-R.