Patient Origin & Market Share Reports

In the current healthcare climate it is important to identify where patients come from and where local residents go for inpatient care. Market knowledge helps hospitals understand and improve their competitive position, target their services, and better address community healthcare needs. Local health departments can use the information to understand gaps in care and to design and evaluate health promotion and quality improvement efforts.

OSHPD has several tools to analyze the geographic distribution "Patient Origin (PO)" or hospital destination "Market Share (MS)" of patients:

PO/MS Reports - for the General Public

  • Patient Origin & Market Share Pivot Tables
    The PO/MS Pivot Tables identify where in the state (specified by ZIP Code) patients come from for treatment at a selected hospital, emergency department, or ambulatory surgery center, as well as the facilities that patients from a selected ZIP Code or county go to for treatment.
  • Healthcare Atlas Hospital “Core Market” Maps
    Hospital markets are defined as the ZIP Code areas in which 70% of the patients from a single hospital reside. The data is based on inpatient data collected by OSHPD’s MIRCal data collection system for discharges during the most recent calendar year.  The detail pages about specific California hospitals provide market information, including patient origin, hospital market area maps, and hospital market geographic overlaps.
  • Patient Origin & Market Share Query Tool
    The PO/MS Query Tool is similar to the PO/MS Pivot Tables but includes service line categories and permits age or payer group selections to support marketing, planning, and evaluation.

PO/MS Reports - for Hospitals and Local Health Departments (Confidential Data)

Hospitals and communities face tremendous budgetary pressures, making the need to understand operating performance critical.   The PO/MS Reports available to California hospital and local health departments include facility, patient ZIP Code and county, age group, payer, and MS-DRG information. Data is available for 2008 onwards and can be requested for one or more years. 

Patient Origin & Market Share Pivot Tables

This product contains the Patient Origin and Market Share Pivot Tables. These pivot tables identify where in the state (specified by ZIP Code) patients come from for treatment at a selected hospital, as well as the hospitals that patients from a selected ZIP Code or county go to for treatment.

Three Easy Steps to Use Pivot Tables:

  1. Download and unzip Pivot Table, preferably to your desktop.
  2. From Pivot worksheet, select variables using drop-down boxes.
  3. Go to Profile worksheet to view results.

If you need technical assistance, please call HIRC at (916) 326-3802.

Data Download

Patient Origin & Market Share Query Tool

Patient Origin Reports

“Patient origin” is the proportion of patients from a hospital, emergency department, or ambulatory surgery center that come from a defined community. Patient Origin Reports display ZIP Codes for patients receiving inpatient, emergency department, or ambulatory surgery care at licensed California facilities.

Market Share Reports

“Market share” is the proportion of a defined community that goes to a particular hospital, emergency department, or ambulatory surgery center. Market Share Reports display the facilities to which patients from a specific ZIP Code or county go for inpatient, emergency department, or ambulatory surgery care.

Patient Origin & Market Share Documentation

Source: Office of Statewide Health Planning and Development, CA Patient Discharge Data.

NOTE: If you have questions about the Patient Origin & Market Share Reports, please E-mail HIRC.


This page was last updated on Thursday, June 29, 2017.

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