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Background Clostridioides difficile infection (CDI), especially recurrent CDI (rCDI), is associated with high morbidity and resource use and imposes a significant burden on the US healthcare system. The objective of this study was to evaluate the burden of rCDI on healthcare resource utilization. Methods A retrospective study analyzed commercial claims data from patients aged 18–64 years old in the IQVIA PharMetrics Plus™ database. CDI episodes required an inpatient stay with CDI diagnosis code (ICD-9-CM 008.45; ICD-10-CM A04.7, A04.71, A04.72), or an outpatient medical claim with CDI diagnosis code plus a CDI treatment, and index episodes occurred from January 1, 2010 to June 30, 2017. Only patients who were observable 6 months before and 12 months after the index CDI episode were included. Each CDI episode was followed by a 14-day claim-free period after the end of treatment. rCDI was defined as another CDI episode within an 8-week window immediately after the claim-free period. Number of CDI and rCDI episodes, healthcare resource use, and costs were calculated over 12-month follow-up and stratified by number of rCDI episodes. Costs were adjusted to 2018 dollars. Results 46,571 patients with an index CDI episode were included, with 3,129 (6.7%) who had 1 rCDI, 472 (1.0%) who had 2 rCDI, and 134 (0.3%) who had 3+ rCDI episodes. Mean age was 47.4 years, and 62.4% were female. In the 12-month follow-up, the mean (SD) numbers of inpatient visits were 1.4 (2.1) for those with no rCDI, 2.7 (3.4) for those with 1 rCDI, 3.7 (3.9) for those with 2 rCDI, and 5.8 (6.0) for those with 3+ rCDI episodes. Emergency department (ED) visits had a similar trend, with mean (SD) number of visits of 1.5 (3.5), 2.5 (6.0), 3.7 (7.0), and 4.6 (13), respectively for the four study groups. All-cause costs after the index CDI were $71,980 for those with no rCDI, $131,953 for those with 1 rCDI, $180,574 for those with 2 rCDI, and $207,733 for those with 3+ rCDI. Conclusion CDI and rCDI are associated with substantial healthcare resource utilization and direct medical costs. During the 12 months after an index CDI episode, the number of inpatient admissions and ED visits increased substantially for patients with an rCDI episode. Direct medical costs for patients with rCDI also increased with number of recurrences. Disclosures All authors: No reported disclosures.

2374. Healthcare Resource Use, Costs, and Recurrences in Patients with Clostridioides difficile Infection: A Real-world Data Analysis