Table 1.

Inclusion and Exclusion Criteria

	Procedure code	Diagnosis code for urolithiasis	Excluded codesa
Inpatient	56.0-ureteroscopic lithotripsy	592.0 or 592.1 or 592.9	Malignancy: 188.0–188.9, 189.1, 189.2, 189.8, 189.9 UPJ obstruction/ureteral stricture: 593.3, 593.2, 753.21
	59.95 or 9851-shockwave lithotripsy
	55.03 or 55.04-percutaneous lithotripsy
Outpatient	52,351 or 52,352 or 52,353-ureteroscopic lithotripsy
	50,590 for shockwave lithotripsy
	50,080 or 50,081 for percutaneous lithotripsy

^aICD-9 diagnosis codes that were excluded in the inpatient or outpatient setting.

UPJ = ureteropelvic junction.