NT Scan and Insurance

Has anyone's NT scan NOT been covered by insurance? I see everyone is pretty much getting it and I'm not sure if I should or not. 
​I have BCBS PPO as my primary (it does have maternity coverage) and Medicaid as my secodary (basically to just fill in the gaps in my primary). 
​I am only 24 (will be 25 by the time I deliver) and no family history of Downs Syndrome, so I'm guessing I have a fairly low risk, and I'm not sure the scan is necessary but if insurance would cover it, I may consider it. 
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​I need to call and see if Medicaid will cover it. Even if my primary doesn't, if medicaid does it will pick up the cost.
​But, I just wanted to see if there was anyone who didn't have it covered by insurance.