Emergency Department and Ambulatory Surgery Data
An outpatient encounter record is submitted each time a patient is treated in a licensed emergency department or ambulatory surgery center in California. These facilities report their encounter data via the Medical Information Reporting for California System (MIRCal).
The reported data include patient demographic information, such as age, sex, county of residence, and race/ethnicity, diagnostic information, treatment information, disposition, and expected source of payment. County Frequencies for Emergency Department and Ambulatory Surgery outpatient encounters by patient county of residence can be downloaded below:
Emergency Department (ED) and Ambulatory Surgery (AS) Facility Summary Reports
Patient level data are reported through the MIRCal system. Facility Summary Reports display a numerical and percentage breakdown of patient level data, combining quarterly report periods into an annual view of a facility's ED or ambulatory surgery encounter data.
Ambulatory Surgery (AS) - Top Ten Procedure Groups - 2015
A statewide listing of the top ten principal procedure groups, based on Current Procedural Terminology, Fourth Edition (CPT-4). Includes both hospital based ambulatory surgery and freestanding ambulatory surgery centers.
Emergency Department (ED) Encounters by Facility - 2014
A listing, by hospital, of the number of ED encounters. Includes both ED encounters and admissions through the ED.
Emergency Department (ED) - Top Ten Causes of Injury - 2015
A statewide listing of the top ten principal external cause of injury codes reported by Emergency Departments. This data is only from ED encounters that did not result in a hospital admission.
Emergency Department Encounter Reports – Top 10 Diagnosis Codes and Groups
A statewide listing of the top ten principal diagnosis codes reported by Emergency Departments. Also included is a statewide listing of the principal diagnosis groups (based on ICD-9-CM codebook chapters). This data is only from ED encounters that did not result in a hospital admission.
To order a Public Use File, see our Data Request Center
View information for Inpatient Discharge Data.
This page was last updated on Monday, June 27, 2016.