We describe malpractice claims closed by plaintiff attorneys after initial medical expert (ME) review. This retrospective study includes 61 cases, of which 33 originated in hospitals, 18 in physicians' offices, and 10 in nursing homes. No claims were against state or federal agencies. The reviews were done between 1987 and 1994 for 29 attorneys from 11 states. The cases fell into 12 diagnostic groups, and leading causes for action were late diagnosis (13 cases), drug administration (11 cases), sepsis (6 cases), and strokes (5 cases). We conclude that internists are particularly liable to unwarranted malpractice claims when unexpected complications occur and when treatment fails to cure infectious disease. However, such claims may be terminated following the initial ME review.