Measuring work complexity for acute care services

Case weights capture the resource cost by diagnosis-related group (DRG) but may not fully reflect the complexity of the clinical services provided. This study describes the use of a work complexity index (WCI), for assessing acute care services focusing on those provided by physicians in healthcare systems. The services are classified using relative value units (RVUs) and their point value assigned using the resource-based relative value scale. 57,559 acute inpatients from a tertiary hospital were first classified into diagnosis-related groups, which together with the relative value units assigned to services were then used to calculate a work complexity index for 38 departments. A case mix index (CMI) was also compiled as a conventional measure of complexity which had a correlation of 0.676 (p < 0.001) with the WCI. The correlation between the WCI and the RVUs representing the weighted volume of physician activities was 0.342 (p = 0.036). The WCI represents a more output or activity focused measure of complexity whereas the CMI is more patient focused and thus provides better insights into Departments' productivity. Although this paper focuses on physicians, the WCI can be easily extended to include other clinical services.