I recieved a 1099-HC form after efiling

If you prepared your original tax return using TurboTax, log in to your account, open the tax return you already filed, and click on the link to amend your return. From there, the software will walk you through the process of filing the amendment.  

The 1099-HC (MA form) is an informational form like the 1099-B (Federal form) that is your proof of insurance.

However, these forms do not have to be used to file your taxes. 

If you are answering questions on the Federal, Health Insurance tab, you will answer that you have insurance and it is not through a marketplace plan.

Form 1099-HC

• The 1099-HC form is a Massachusetts document that serves as proof of health insurance coverage for MA adult residents.  Every MA resident who has insurance will receive an annual 1099-HC form which is completed and provided by your insurance carrier. 
• You do not need to file Form 1099-HC. The form is informational and should be used to complete a new Schedule HC form with your MA residential tax form. Schedule HC is now a required tax return attachment for all MA residents.  {From: Form 1099 HC