Call insurance company or check brochure if you have insurance. It is 100% covered by many insurances for certain age group, etc.
e.g.,
Are mammograms covered by health insurance?
Medicare, Medicaid and most insurance companies cover the cost of mammograms. Since September 2010, the Affordable Care Act has required all new health insurance plans to cover screening mammograms every 1-2 years for women ages 40 and older, with no out-of-pocket costs (co-payments or co-insurance) [16].