Objectives: To quantify differences in prices paid and procedural complications incurred in hospital outpatient departments (HOPDs) and freestanding ambulatory surgery centers (ASCs).
Study design: Observational study using deidentified 2019-2020 insurance claims from Blue Cross Blue Shield insurance plans nationally, with information on prices paid and complications incurred for colonoscopy, knee or shoulder arthroscopy, and cataract removal surgery.
Methods: The data include 1,662,183 patients who received a colonoscopy, 53.5% of whom were treated in HOPDs; 259,200 patients who underwent arthroscopy, 61.0% of whom were treated in HOPDs; and 173,664 patients who had cataract removal surgery, 34.7% of whom were treated in HOPDs. Multivariable linear regression methods were used to identify the associations between HOPD and ASC site of care, prices, and complications after adjusting for patient demographics, risk, and geographic market location.
Results: After adjusting for patient characteristics, risk, and geographic market location, prices paid in HOPDs were 54.9% higher than those charged in ASCs for colonoscopy (95% CI, 53.6%-56.1%), 44.4% higher for arthroscopy (95% CI, 43.0%-45.8%), and 44.0% higher for cataract removal surgery (95% CI, 42.9%-45.5%). Adjusted rates of complications were slightly higher in HOPDs than ASCs for colonoscopy over a 90-day interval but similar over the 7- and 30-day intervals. Rates were statistically and clinically similar between the 2 sites of care for arthroscopy and cataract removal.
Conclusions: The higher prices charged in HOPDs for the 3 ambulatory procedures were not balanced by better quality-as measured by rates of procedural complications-compared with procedures performed in nonhospital ASCs.