Assessment of outpatient chemotherapy and unplanned emergency department visits in a large community hospital system.
Authors: Dvorak Tomas , Maroney Thomas T , Dhannapuneni Srujankumar , Stephenson Ian , Laughlin Amy Iarrobino 
Published: June 2023

e18768 Background: Unplanned complications of outpatient chemotherapy can significantly affect patient oncologic outcomes, health, and increase cost of care. CMS rule OP-35 evaluates quality of care for Medicare patients by assessing the risk of emergency department (ED) visit within 30 days after outpatient chemotherapy administration. This study reviews this measure for all oncology patients treated in our community hospital setting. Methods: Patients treated between 02/2012 and 04/2021 were identified. Age at first chemotherapy administration, gender, cancer diagnosis, and chemotherapy regiment were evaluated. Chemotherapy was stratified into cytotoxic therapy, immunotherapy, targeted therapy, and endocrine therapy. ED visits were only those in our hospital system. 30-day risk of ED visit was calculated for individual chemotherapy administrations. Internal results were compared with our CMS OP-35 results for concordance. Results: There were 19,732 patients who received chemotherapy treatments between 02/2012 and 04/2021, with 262,379 chemotherapy administrations. Individual chemotherapy administration had 5.2% risk of a 30 day ED visit. Cumulative risk of a patient having a 30 day ED visit was 32.9%. From ED, patients had 61.2% rate of hospital admission, vs 24.8% rate for general ED population. By age at first chemotherapy administration, the risk of 30 day ED visit was 6.3% for age < 18, 5.4% for age 18-64, and 5.9% for age > = 65. Our rate was relatively stable between 2014 and 2020. Our corresponding CMS score was 5.5% in 2016, 5.5% in 2018, and 5.1% in 2019. By gender, the risk was 5.6% for male and 5.0% for female patients. By chemotherapy category, the risk was 5.9% for cytotoxic chemotherapy, 7.5% for immunotherapy, 4.2% for targeted therapy, and 5.2% for endocrine therapy. Carboplatin/paclitaxel was the most common drug combination administered, with 8.7% risk. Cytarabine/methotrexate combination had the highest risk at 57.0%. By ICD diagnosis, breast cancer accounted for most patients and most chemotherapy administrations, with 30 day ED visit risk of 3.6%. Multiple myeloma had the highest rate of chemotherapy administrations at 26.3 per patient and a risk of 4.0%, compared with 13.3 across the entire population. Stomach cancer had the highest risk of 30 day ED visit at 10.0%. Conclusions: The risk of 30 day unplanned ED visit was elevated in pediatric patients, and was similar in patients 18-64 and > = 65 years of age, and corresponded well to our CMS OP-35 metric, despite only tracking internal ED visits. Immunotherapy had significantly elevated risk compared with cytotoxic therapy, while targeted therapy had the lowest risk of ED visit. There were significant differences depending on disease site. We have established a baseline, and developed a live dashboard in our electronic medical record to monitor this metric globally, and to intervene in patients at high risk of 30 day ED visit.