Bob Herman covers health insurance, government programs, hospitals, physicians, and other providers — reporting on how money influences those businesses and shapes what we all pay for care. He is also the author of the Health Care Inc. newsletter. You can reach Bob on Signal at bobjherman.09.SAN DIEGO — Optum, the health data and care provider division of UnitedHealth Group, is developing a way to calculate how sick Medicare patients are through artificial intelligence, instead of relying solely...