607. Identifying Intervention Opportunities to Prevent Readmissions during OPAT

Background Patients receiving outpatient parenteral antimicrobial therapy (OPAT) experience high rates of unplanned readmissions. To inform interventions that may reduce risk of unplanned readmissions during OPAT, we examined the frequency and reasons for readmission in a large cohort of OPAT patients. Methods We analyzed data on all patients enrolled in UNC’s OPAT program from February 2015-February 2020. Patients were evaluated by an infectious diseases (ID) physician prior to OPAT enrollment, discharged with >14 remaining days of prescribed therapy, and received care coordination and systematic monitoring by an ID pharmacist. We abstracted EHR data into a REDCap database to ascertain information on each patient’s OPAT course and readmission details: length of stay, primary ICD-9-CM/ICD-10-CM diagnosis code associated with readmission, and reason for readmission from clinical notes. Diagnosis codes and notes were adjudicated and summarized by a multidisciplinary team. Results Among 1,165 OPAT courses, 19% resulted in at least one readmission during therapy, lasting for a median length of stay of 5 days. Among those patients who were readmitted during OPAT, the median time from OPAT start to readmission was 17 days (interquartile range, IQR: 8-29 days). 66% of readmissions preceded the scheduled follow-up appointment during OPAT (median time to scheduled follow-up was 27 days, IQR: 15-35 days). 55% of readmissions were unrelated to OPAT diagnosis. Based on ICD-9-CM/ICD-10-CM code classifications, the most common infectious diseases-related reasons for readmission were worsening OPAT infection (18%), OPAT-related adverse drug reaction (12%), and new infection (11%). Conclusion One-fifth of OPAT courses resulted in readmission during therapy. Half of readmissions were associated with OPAT or other infection, and half were for other reasons. Earlier post-discharge follow-up by a multidisciplinary team (including primary care providers, case management, and OPAT) might prevent infection-related readmissions for OPAT patients. Future work should also address the need for enhanced care coordination with non-infectious disease providers to manage OPAT patients. Disclosures All Authors: No reported disclosures