It doesn't make sense to treat Dan's bleeding ulcer, without attention to the depression that spurs him to drink alcohol excessively, which contributes to ulcer development. Nor is it prudent to ignore Nancy's anxiety that prevents her following through on chemotherapy for breast cancer. The connections are obvious, yet today connecting treatments for mind and body is a rare occurrence. Mental health and substance-abuse disorder assessments and interventions are separated by the payment mechanics of health plans, which encourage independent delivery of services. Dr. Kathol, a veteran...