Development of Novel Formulas to Determine Hospital and Pharmacy Opportunities to Reduce Extended Length of Stay

Background: Hospital length of stay (LOS) is an important measure to determine resource utilization and efficiency of care for inpatients. No existing objective methodology is available to determine where and how pharmacy departments can have maximal impact on reducing extended LOS. Objective: An objective methodology to guide decisions by hospital pharmacy departments on reducing extended LOS is described. Methods: University of North Carolina Medical Center’s LOS was compared to hospitals with similar inpatient bed size and case mix index. Objective methodology using pharmacy intensity weight, LOS index, and relative number of cases overall and by hospital service was developed to identify targets of impacting LOS for a pharmacy department. Results: The novel Pharmacy Opportunity Length of Stay (POLOS) formula was developed to prioritize each Medicare Severity Diagnosis Related Group (MSDRG) based on the overall impact pharmacy can have on reducing extended LOS at an individual institution. An additional novel formula, Service Specific POLOS (SSPOLOS), was created to strategically target hospital services, as opposed to MSDRGs, allowing for effective deployment of targeted pharmacy interventions to decrease extended LOS. Conclusion: POLOS and SSPOLOS are novel formulas to guide pharmacy departments in objectively prioritizing and targeting resources to reduce extended LOS. The novel formulas can be used to quantify LOS performance at the hospital and pharmacy specific levels, in addition to providing a hospital service approach to launch LOS initiatives at health care institutions. To our knowledge, this represents the first opportunity for hospital pharmacy departments to objectively target and reduce extended LOS.