Big Tech Expands Footprint in Health

Amazon.com Inc. is starting to sell software that mines patient medical records for information doctors and hospitals could use to improve treatment and cut costs. The move is the latest by a big technology company into health care, an industry where it sees opportunities for growth.

The market for storing and analyzing health information is worth more than $7 billion a year, according to research firm Grand View Research, a business in which International Business Machines Corp.’s Watson Health and UnitedHealth Group Inc.’s...