The most effective method of identifying what books the libraries have on a topic is to determine and use relevant Library of Congress subject headings.
Subject headings are standardized terms and phrases used to describe the overall topics of a book.
Subject headings identify books on the same or very similar topics in uniform terms that are not dependent on the author's terminology or the title of the book. Type a word or phrase that describes the topic. Appropriate subject headings may be found by browsing the list. Viewing these suggestions may identify additional subject headings to use. The first entry indicates there are 16 other headings relating to health insurance that may be searched also.