I have filed my joint return with wife and recently received form 1042-S from my spouse's last employer with Income code 15 . how to report it in turbo tax state/federal?

[KristinaK]

Income code 15 on Form 1042-S is for Retirement Income. You will need to amend your tax return and include that information in the return. 

When you start entering the information as if you received a 1099-R (do a search for 1099-R, then Jump to), you will get to a point in the interview where you can mark the box indicating that you are preparing a 1099-R substitute.