BRCA1/2 Testing in Massachusetts Among Women With Private Insurance or Medicaid, 2011-2015.

Purpose: Testing for BRCA1/2 mutations has increased among privately insured women in the United States. However, little is known about testing rates or trends among women with Medicaid. We sought to determine whether BRCA1/2 testing rates differed between women with private insurance compared with women with Medicaid in a state where both insurance types cover the test, and to compare testing trends from 2011 to 2015.

Methods: We conducted a retrospective cohort study of medical claims from January 2011 through June 2015. We included Massachusetts women aged 18-64 with private insurance or Medicaid and at least 12 months of continuous enrollment. We used multivariable linear regression to examine the association of insurance type, age, and time with testing rates.

Results: Mean monthly BRCA1/2 testing rates were lower among women with Medicaid compared with those with private insurance. Among privately insured women, mean monthly rates rose from 9.3 per 100,000 in 2011 to 18.4 per 100,000 in 2015, while among Medicaid-insured women, rates increased from 3.7 to 14.7. There was no difference in the monthly rate of increase in both groups (P=0.07). In adjusted analyses, rates were lower among Medicaid-insured women (7 fewer tests per month than privately insured women, P<0.001), and differed by age, with women aged 44-54 most likely to receive testing and women 18-34 the least likely.

Conclusion: BRCA1/2 testing rates were lower among women insured by Medicaid compared with those with private insurance, though rates increased from 2011 to 2015 among both groups of women at a similar rate.