Post-acute care facility utilization and outcomes among Medicare beneficiaries undergoing inpatient cancer surgery.

11088 Background: Patients with cancer using post-acute care facilities have poor outcomes, including delayed return home and increased health care utilization. However, little is known about post-acute care use and outcomes among patients with cancer undergoing surgery. Methods: We examined Medicare claims of 100% of fee-for-service Medicare beneficiaries from 2010-2022, to identify patients who underwent inpatient cancer-directed surgery and were thus eligible for a post-acute facility stay. We used billing codes within 3 days of hospital discharge to identify post-acute facility stays, defined as skilled nursing facility (SNF), long-term acute care hospital (LTACH), or inpatient rehabilitation facility (IRF) stays. We used logistic regression to identify patient sociodemographic and clinical factors associated with post-acute care facility use. We also compared hospital readmissions within 30 days and days at home (defined as days not in an acute or post-acute facility) in the 90 days after discharge by setting, using Chi-square and Wilcoxon rank sum tests. Results: We studied 1,637,792 Medicare beneficiaries who underwent inpatient cancer surgery from 2010 to 2022. About half (48.9%) were women; median age was 73.0 years. The most common cancer diagnoses were colorectal (28.4%), lung (14.4%), and prostate (12.1%), and 22.7% had a Charlson comorbidity index (CCI) of ≥3. Overall, 16.0% of patients were discharged to a post-acute care facility (11.4% SNF, 4.5% LTACH/IRF). Discharge to post-acute care was greater among patients who were aged ≥80 vs 65-69 (Adjusted Odds Ratio[AOR] 3.85, 95% Confidence Interval[CI] 3.79,3.90), had CCI ≥3 versus 0 (AOR 2.92, 95%CI 2.88,2.95), were dual-eligible (AOR 2.01, 95%CI 1.99,2.04), or had metastatic cancer (AOR 1.26, 95%CI 1.24,1.28). Patients undergoing brain or spinal surgeries for primary or metastatic cancers had highest odds of PAC facility utilization. Compared to those discharged home, patients discharged to post-acute care facilities had a higher 30-day hospital readmission rates (18.6% vs. 9.5%, p<0.0001), and fewer days at home in the 90 days after discharge from their index surgical admission (median 68 vs. 90 days, p<0.0001). Conclusions: Patients with cancer undergoing inpatient surgery who are older, have comorbidities, or have advanced disease have higher rates of post-acute care facility use, and such post-acute care is associated with higher hospital readmissions and fewer post-operative days at home. Further work is needed to improve pre-operative decision-making and optimization as well as to develop supportive care and rehabilitative interventions that can improve post-operative outcomes for patients who need post post-acute care.