In box 12 of my W-2 it says D 18 followed by the amount, what does this mean and should I have included the 18 with the amount when I entered it into TurboTax?

[forsythm517]

I only entered the amount after D 18 into TurboTax when I was prompted.

[Critter · Accepted solution]

The "18" means 2018 ... in the program only enter the D.