Biliary dyskinesia: a surgical disease rarely found outside the United States.

Background: Our objective was to determine if cholecystectomy for biliary dyskinesia (BD) was performed more commonly in the United States than in 4 comparator countries around the world.
Methods: Using the Nationwide Inpatient Sample, we extracted and analyzed data for cholecystectomy from 1991 to 2011 using ICD-9 (International Classification of Diseases 9th Revision) procedure codes. To derive the number of cholecystectomies performed for BD, we used the ICD-9 code 575.8, greater than 80% of which are patients with BD. The same or equivalent code was used for the international comparator group. Through a SURGINET query we obtained data from verifiable national databases in 4 developed countries including the Swedish quality registry for surgical treatments of gallstone-related conditions (GallRiks), the Norwegian Cholecystectomy Registry, the Australian Bureau of Statistics, and the Polish National Health Insurance Agency.
Results: In the years ranging from 2008 to 2011, the number of cholecystectomies for BD per 1,000,000 population per year was less than 25 in the 4 comparator countries and greater than 85 in the United States (P < .01). From 1991 to 2011, the number of cholecystectomies for BD in the United States significantly increased from 43.3 to 89.1 per 1,000,000 population (P < .01).
Conclusions: These data strongly suggest that cholecystectomy for BD is over utilized in the United States. In addition, this trend continues to increase in frequency.
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