W-2 box 12 more than four codes needed
My wife's W-2 has codes and values in boxes 12a (code C), 12b (code D), 12c (code AA), and 12d (code DD). She contributed to her HSA, and should also have a code W box 12 entry. Is this not included in her W-2 since there are only four boxes available? How do i correct this? Is this information available elsewhere?