W-2 Box 12W employer contribution is not there

Hello,

 

I was going through my W-2 and noticed that I don't have code W in my box 12, and I am seeking some clarification on the matter. 

 

Here is the context. I enrolled in an HSA and starting receiving contributions in November. My employer contributes $200 / month (not taken out of my paycheck). I personally did not contribute any of my money or paycheck to my HSA and only have the $400 from my employer contributions. 

 

On my W-2 there is no code W. From my understanding I should have a code W for $400 for the employer contributions regardless of whether they came out of my paycheck or not. 

 

Is this something I report on my taxes myself, and if so where would the appropriate place be? Or is there an error on my W-2? 

 

All advice is greatly appreciated, thanks!