Why is my HSA contribution needed?

[spikehansen128]

Why does IRS need my HSA contributions?

[Mike9241]

If you got a W-2 it's most likely that your employer contributed to an HSA for you. Look for box 12 code W. That's the HSA contribution. Your employer can contribute, and you not, but it's treated as if you contributed. 

If it's not on your W-2 and since you didn't contribute directly, it's possible someone misfiled something using your SSN. Rad the notice and proceed as directed if you disagree.