You are correct, the Affordable Care Act requires employers to report the cost of coverage under an employer-sponsored group health plan. However, this requirement is still being transitioned in, so some Employers are still exempt from this requirement.
You should receive a Form 1095-B from your Health Insurance Provider reporting you coverage details, including which months you were covered. This form is not required to file your return but will help you answer questions as you move through the process of completing your return in TurboTax.
Check out the TurboTax FAQ below for more details:
https://ttlc.intuit.com/replies/4829605