I didn't receive form MA 1099HC, how do I proceed without entering the Ins Co subscriber no?

[ChrisJ]

Form 1099-HC is a form that you need to complete your Massachusetts state return. It serves as proof that you had health insurance coverage. You can complete your Massachusetts return without one, but you will not be able to e-file that return. You should contact your insurance provider to get a copy of the 1099-HC form before you file your return.