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An Instrumental Variable Analysis Comparing Medicare Expenditures for Laparoscopic vs Open Colectomy.
Kyle H Sheetz1,2, Edward C Norton3,4,5, Scott E Regenbogen1,2
1Department of Surgery, University of Michigan, Ann Arbor.
JAMA Surgery
|June 15, 2017
Summary
Laparoscopic colectomy lowers Medicare costs compared to open surgery, primarily due to reduced readmission and postacute care expenses. Selection bias influences cost estimates in comparative effectiveness research.
Area of Science:
- Surgical Oncology
- Health Services Research
- Health Economics
Background:
- Laparoscopic surgery is often associated with lower healthcare costs than open procedures.
- The degree to which cost differences are attributable to the surgical approach versus patient selection bias remains unclear.
Purpose of the Study:
- To evaluate Medicare expenditures for laparoscopic versus open colectomy.
- To identify the drivers of cost differences between the two surgical approaches.
Main Methods:
- Population-based study of Medicare beneficiaries undergoing colectomy (2010-2012).
- Instrumental variable methods used to control for selection bias.
- Analysis of Medicare payments, including physician fees, readmissions, and postacute care, up to one year post-operation.
Main Results:
- Laparoscopic colectomy was associated with lower total Medicare expenditures compared to open colectomy, even after accounting for selection bias.
- Key cost savings were driven by reductions in readmission and postacute care payments.
- The magnitude of cost reduction was smaller when accounting for selection bias.
Conclusions:
- Selection bias significantly impacts cost estimates in comparative effectiveness research.
- Laparoscopic colectomy reduces overall healthcare episode payments, with savings primarily realized in the postacute care period, not the initial hospitalization.
