Appendix 3.

Inclusion criteria

Bariatric surgery procedure codes
Bariatric surgery procedure*	ICD-9 code	CPT code
Biliopancreatic diversion	43.7, 45.91	43633, 43845
Open Roux-en-Y-gastric bypass	44.39, 44.31	43846, 43847
Laparoscopic Roux-en-Y-gastric bypass	44.38	43644
Laparoscopic vertical sleeve gastrectomy	43.82	43775
Open & laparoscopic adjustable gastric band	44.69, 44.95	43843, 43770

Bariatric surgery or bariatric surgery referral must be within the date range 1/1/2011-6/1/2016.

^*Identified in both inpatient and outpatient surgical procedure tables within CDW