The "preexisting condition" invention in American health care: A lingering threat to preventive care: This second of a two-part series reveals how new research has detailed how expanded access to health insurance is aiding preventive care, and how further gains could be thwarted by unresolved insurance provisions: This second of a two-part series reveals how new research has detailed how expanded access to health insurance is aiding preventive care, and how further gains could be thwarted by unresolved insurance provisions.