Objectives: To explore the impact of post-procedure delirium on resource utilization following transcatheter and surgical aortic valve replacement (TAVR and SAVR, respectively).Background: Postprocedure delirium is associated with worse long-term survival after TAVR and SAVR. However, its effect on resource utilization has been understudied.Methods: Using the 2015 Medicare Provider Analysis and Review File (MedPAR), we retrospectively analyzed elderly (≥80 years) Medicare beneficiaries receiving either SAVR or endovascular TAVR in the United States. Multivariate regression models estimating hospitalization cost and length of stay (LoS) were adjusted for patient demographics, comorbidities, and nondelirium complications.Results: A total of 21,088 discharges were available for analysis (12,114 TAVR and 8,974 SAVR).TAVR patients were older (87 AE 3.8 vs. 84 AE 2.7 years; P < 0.001) with a higher comorbidity burden (Charlson index 3.0 AE 1.8 vs. 2.1 AE 1.7; P < 0.0001). Despite this, fewer TAVR patients (1.6%) experienced postoperative delirium during the index hospitalization compared to surgical patients (3.6%; P < 0.