Massachusetts Patient Origins (Published January 2018)

Massachusetts Patient Origins (published January 2018)

Example or Patient Origins mapThe Massachusetts Patient Origins map lets users identify the areas from which hospitals and hospital systems draw their patients by illustrating the distribution of hospital inpatient discharges in 2016 by patient zip code, for each acute care hospital and 11 hospital systems in Massachusetts.

Using the Hospital Inpatient Discharge Database (HIDD) Case Mix data, areas in red and yellow represent ZIP codes with a high number of discharges, while blue areas represent ZIP codes with low numbers of discharges for each hospital or hospital system.

Please note that discharge densities are relative and hospital-specific; therefore it is not possible to directly compare the size and intensity of shaded areas across hospitals or hospital systems.

(click map to activate the web application)

How to Use the Map

mapAfter opening the map application, the viewer displays a topographical map of the Commonwealth of Massachusetts and a selectable series of layers listing out Massachusetts hospitals and hospital systems.

The right-hand-side pane contains a “Layer List.” Each layer represents an acute care hospital in Massachusetts, listed alphabetically. The map includes data for 59 acute care hospitals in Massachusetts. You can select and deselect hospitals by clicking on the box to the left of the layer name. When a hospital layer is activated, a colored overlay will appear on the map.

In addition to individual hospital layers, the map contains layers for Massachusetts hospital systems operating in Massachusetts. These layers present discharges by patient zip code, totaled across all member hospitals.

Areas of higher intensity (i.e., ZIP codes with higher numbers of discharges) are colored red and yellow and areas of lower intensity are colored in blue. Note that as the user zooms in and out of the map, the size and granularity of the colored overlay changes.

When you click on the center of a shaded area of the map, a pop-up window appears. The window displays the following information: zip code, city, hospital name, and affiliated hospital system. If the hospital is not affiliated with any system, the entry is blank.

You can use the following icons to modify your map view.

 Zoom in or out of the map; located at the top-left corner of the application.
 Returns the map to the original view; located just below the zoom tools.
 Allows the network to detect your physical location and zoom the map to it.
 Search for and zoom to a specific hospital or street address.
 Learn more about the Patient Origin map.
 Change the display of the underlying map. Choose between various topographic and street-level maps. Note that changing maps will not alter the data.
 Print the current map.

Notes about Patient Origins Map Data

  • Only Massachusetts ZIP codes are included in the map.
  • ZIP codes with fewer than 26 total discharges are not displayed to preserve data confidentiality.
  • Relative density scales are hospital-specific, and vary across hospitals and hospital systems (i.e., “high” and “low” densities may represent different discharge counts for different hospitals). Therefore, while it is possible to display multiple hospitals and/or systems at a time on the map, densities are not comparable and it is recommended that users select only one hospital or system at a time.
  • Shaded areas are positioned according to calculated center points (centroids) for each 5-digit ZIP Code.  Points do not represent specific street addresses.
  • When opening the underlying data attribute table for a hospital layer, some zip code records may not be present in the table.  This occurs when the “Filter by Map Extent” option is selected and the attribute table itself obscures any shaded portion of the map. In these cases, obscured zip codes are omitted from the data table.  You can reveal the missing records by panning so that shaded areas of the map are visible in the map viewer.
  • When viewing maps, it is recommended you use the latest version of Mozilla Firefox, Google Chrome, or Safari. Older versions of these browsers, as well as versions of Internet Explorer, may have viewing and performance limitations.
  • Dana-Farber Cancer Institute, Massachusetts Eye and Ear Infirmary, Shriners Hospitals for Children – Boston, and Shriners Hospitals for Children - Springfield are not depicted because all patient origin ZIP codes fell below the 26-discharge threshold.
  • Baystate Mary Lane Hospitalonly displays data from October 1, 2015 through September 10, 2016 as it closed.
  • Hospital system affiliations are based on arrangements as of September 2016.

Patient Origins Map Data Source

Hospital discharge data comes from the Hospital Inpatient Discharge Database (HIDD), Fiscal Year (FY) 2016. HDD data are submitted quarterly by acute hospitals. The HDD contains patient-level data—including zip code of residence—for all acute inpatient discharges. FY 2016 data includes information on discharges occurring between October 1, 2015 and September 30, 2016. Patient origin was determined by each patient’s reported zip code of residence. Discharges were totaled for each zip code in Massachusetts.

For additional information about acute care hospitals in Massachusetts, please see CHIA’s Acute Hospital Profiles. For information about patient discharges by ZIP code, please refer to the FY16 Patient Origins Databook.