Day Procedure Group (DPG) is a national classification system for ambulatory hospital patients that focuses on the area of day surgery. Patients are assigned to categories according to the principal or most significant procedure recorded on the patient abstract. Patients assigned to the same DPG group represent a homogeneous cluster with similar clinical episodes who require similar resources. Each DPG group is assigned a DPG Resource Intensity Weight (RIW) value, which is used to standardize the expression of hospital day surgery volumes, recognizing that not all day surgery patients require the same health care resources. The volume of day surgery cases is then expressed as total day surgery weighted cases. These weighted cases can be directly compared with the inpatient weighted cases and Comprehensive Ambulatory Classification System (CACS) weighted cases. Note that 2010 was the final year for DPG. As of 2011–2012, all ambulatory care is grouped using CACS.

Product Overview

There are 115 DPG groups, each one defined by a set of intervention codes from CCI. In the 2008 version of DPG, several new DPG groups have been created using the data element anesthetic technique.


A facility’s case volume, its case mix and an estimate of resources consumed in the day surgery setting can be estimated using the DPG methodology and DPG RIW values. A health care facility can analyze its same-day surgery activity for planning, cost analysis and utilization, and for quality-management purposes. It can compare inpatient activity to outpatient activity, as well as to the CIHI database.


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Download / Purchase the latest version of the DPG Directory

Download / Purchase the latest version of Day Procedure Groups (DPG) 2010 RIW and Title Table (ZIPFile)