Underinsurance before the implementation of the Affordable Care Act: From the Research Involving Outpatient Settings Network (RIOS Net).

Background: As the Affordable Care Act (ACA) is implemented and many uninsured become insured, rates of underinsurance may persist or increase. This study was designed to estimate the rate of underinsurance in primary care safety net clinics serving low income, multiethnic populations in New Mexico.

Methods: Data were collected from 2 primary care clinics in an urban setting during a 2-week period in 2011 and 2012.