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Performance of the ACG case-mix system in two Canadian provinces
R J Reid1, L MacWilliam, L Verhulst
1Centre for Health Services and Policy Research, University of British Columbia, Vancouver, Canada.
Medical Care
|February 15, 2001
Summary
The Adjusted Clinical Group (ACG) system effectively explains healthcare costs in Canada, similar to its performance in the US. This system, using diagnoses from claims and records, is feasible for Canadian health plans.
Area of Science:
- Health Services Research
- Health Economics
- Public Health
Background:
- The Adjusted Clinical Group (ACG) system, widely validated in the US, has seen limited application in other developed nations.
- This study investigates the ACG system's performance and cost-accounting capabilities in two Canadian provinces.
Purpose of the Study:
- To assess the feasibility and performance of the ACG system in Canada.
- To determine the extent to which ACGs can predict same-year and next-year healthcare expenditures.
Main Methods:
- Utilized data from continuously enrolled residents of Manitoba and British Columbia (1995-1997).
- Assigned ACGs based on fee-for-service physician claims and hospital separation diagnoses.
- Employed linear regression to analyze the variation in individual physician and total healthcare costs (truncated at the 99th percentile).
Main Results:
- The ACG system explained approximately 50% of same-year and 25% of next-year physician cost variations.
- For total costs, the ACG system explained approximately 40% of same-year and 14% of next-year variations.
- Data quality was high, with less than 2% of diagnoses rejected.
Conclusions:
- ACG system application is feasible in Canada using existing healthcare data.
- The system's ability to explain cost variations is comparable to findings in US health systems.
- Further research is needed to evaluate ACGs' accuracy in reflecting population morbidity and healthcare needs.