It’s really not a good idea to file without Form 1095-A. If you enrolled in coverage through the Marketplace, you’ll need the information on Form 1095-A to complete Form 8962 to reconcile any advance payments of the premium tax credit, or claim the premium tax credit, and to file a complete and accurate tax return. The information on the documentation you have may be incorrect or incomplete.
The IRS advises that if you’re expecting to receive a Form 1095-A, wait to file your 2017 income tax return until you receive that form. For tax year 2017, the deadline for the Marketplace to provide Form 1095-A is January 31, 2018, so you should hopefully get the form soon.