Max Rady College of Medicine

Term: Primary Diagnosis

Printer friendly

Glossary Definition

Last Updated: 2011-06-02


Also known as the "most responsible diagnosis", this is the discharge diagnosis most responsible for the length of a patient's hospital stay. Used in Canada. Studies have shown a 98% equivalence rate for AMI, comparing with the term "principal diagnosis" that is used in the United States.

Manitoba Health Services Commission considers the primary diagnosis to be an important condition of the patient which usually has a significant influence on the patient's length of stay and/or significantly influences the management/treatment of the patient while in hospital.

Related concepts 

Related terms 


  • Tu JV, Austin PC, Walld R, Roos L, Agras J, McDonald KM. Development and validation of the Ontario acute myocardial infarction mortality prediction rules. J Am Coll Cardiol 2001;37(4):992-997. [Abstract] (View)

Contact us

Manitoba Centre for Health Policy
Community Health Sciences, Max Rady College of Medicine,
Rady Faculty of Health Sciences,
Room 408-727 McDermot Ave.
University of Manitoba
Winnipeg, MB R3E 3P5 Canada