Before private insurance market rules in the Affordable Care Act (ACA) took effect in 2014, health insurance sold in the individual market in most states was medically underwritten.1 That means insurers evaluated the health status, health history, and other risk factors of applicants to determine whether and under what terms to issue coverage. To what extent people with pre-existing health conditions are protected is likely to be a central issue in the debate over repealing and replacing the ACA.
This brief reviews medical underwriting practices by private insurers in the individual health insurance market prior to 2014, and estimates how many American adults could face difficulty obtaining private individual market insurance if the ACA were repealed or amended and such practices resumed. We examine data from two large government surveys: The National Health Interview Survey (NHIS) and the Behavioral Risk Factor Surveillance System (BRFSS), both of which can be used to estimate rates of various health conditions (NHIS at the national level and BRFSS at the state level). We consulted field underwriting manuals used in the individual market prior to passage of the ACA as a reference for commonly declinable conditions.