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130th Annual Meeting Abstracts

Primary Payer Status Affects Mortality For Major Surgical Operations
*Damien J LaPar, *Castigliano M. Bhamidipati, *Carlos M Mery, *George J Stukenborg, David R Jones, Bruce D Schirmer, Irving L Kron, MD, *Gorav Ailawadi, MD
University of Virginia, Charlottesville, VA

Objectives: Medicaid and Uninsured populations are a significant focus of current healthcare reform. We hypothesized that outcomes following major surgical operations in the United States is dependent on primary payer status.
Methods: From 2003-2007, 893,658 major surgical operations were evaluated using the Nationwide Inpatient Sample (NIS) database: lung resection, esophagectomy, colectomy, pancreatectomy, gastrectomy, abdominal aortic aneurysm repair, hip replacement, and coronary artery bypass. Patients were stratified by primary payer status: Medicare (n=491,829), Medicaid (n=40,259), Private Insurance (n=337,535), and Uninsured (n=24,035). Multivariate regression models were applied to assess outcomes.
Results: Unadjusted mortality for Medicare (4.4%, OR= 3.51), Medicaid (3.7%, OR: 2.86) and Uninsured (3.2%, OR: 2.51) patient groups were higher compared to Private Insurance groups (1.3%, p<0.001). Moreover, mortality was lowest for Private Insurance patients independent of operation. Importantly, after controlling for age, gender, income, geographic region, operation, and 30 comorbid conditions, Medicaid payer status was associated with the longest length of stay and highest total costs (p<0.001). In addition, Medicaid (p<0.001) and Uninsured (p<0.001) payer status independently conferred the highest adjusted risks of mortality (Table 1).
Table 1: Multivariate regression analyses for adjusted outcomes.
OutcomeMedicaidUninsuredMedicarePrivate Insurance
In-Hospital Mortality*1.97 (1.84-2.10)1.74 (1.60-1.90)1.54 (1.48-1.61)Ref
Length of Stay (days)*10.49±0.047.01±0.038.77±0.017.38±0.01
Total Costs ($)*$79,140±251.4$65,667±231.0$69,408±53.1$63,057±53.0
* p<0.001. Reference group: Private Insurance. In-hospital mortality reflected as Odds Ratios (95% Confidence Interval), Length of Stay and Total Costs reflected as adjusted means.

Conclusions: Medicaid and Uninsured payer status confers increased risk of adjusted mortality. Medicaid was further associated with the greatest adjusted length of stay and total costs despite risk factors or operation. Possible explanations include delays in access to care or disparate differences in health maintenance.


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Wednesday, May 22, 2019