Diagnosis: Unknown is an American medical drama that aired on CBS television from July 5 to September 20, 1960. The series aired as a summer replacement for The Garry Moore Show from 10 to 11 p.m. on Tuesdays. Patrick O'Neal played Daniel Coffee, head of a hospital's pathology lab.
Daniel Coffee, head of a hospital's pathology lab, worked with police to find criminals who committed bizarre murders. Lab assistants Doris Hudson and Motilal Mookerju supported Coffee in his work. Link, a boy who worked as handyman, kept the lab clean.