Yes, you will need to report the Social Security check you received on your 2017 Tax Return. You should receive Form 1099-SA reporting the income in the mail.
If you haven't received it in the mail yet, you can click this link to the Social Security Administration for details on how to get hold of a copy: How Can I Get My 1099-SA.
[Edited 02.07.18 |1:11PM]
