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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) Profile Reports

ED and AS Profile Reports are collected through MIRCal and may be accessed by data type, facility ID# or facility name and report period begin and end dates. Each report consists of a two-page summary which represents the number and percentage of each data element for a given facility.

Frequencies

Data Download

Ambulatory Surgery Center Encounters, County Frequencies by Patient County of Residence
Emergency Department Encounters, County Frequencies by Patient County of Residence

See also: ICD-9-CM Code Frequencies, CPT Code Frequencies

Reports

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.

Other Information

To order a Public Use File, see our Data Request Center

View information for Patient Discharge Data.

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