Did that come from the City of Chicago, by any chance?  I'm not asking because a lot of Chicago police officers were injured last year, but because there's an example of the notice online:

https://dqjghx1vau0u.cloudfront.net/uploads/assets/30690/original.pdf?1454507714

At the bottom it says to attach the notice to the tax return.  

The city probably does not want to issue a corrected W-2 because they use the Box 1 amount for other purposes, like calculating pension benefits.  And I'm guessing that its public-safety workers are covered by Social Security, so there are no amounts in Boxes 3 and 5. 

Others have asked the question online and the answer has been to subtract it out on Schedule 1, Line 8, as a negative number for "other income."  I don't think that's the best solution, but it's probably the only one for now. 

That TAM number does not exist -- maybe it has been renumbered, or obsoleted.