Emergency Department Database (EDD) Reporting

Overview

The acute care hospital emergency department data dashboard contains data through December 2025. The primary purpose of this series is to provide timely patterns and trends on key emergency department (ED) utilization measures.

CHIA’s Emergency Department Database (EDD) consists of ED visits from all acute care hospitals in Massachusetts resulting in neither an inpatient admission nor an observation stay—commonly referred to as treat-and-release visits. Acute care hospitals submit data quarterly to CHIA’s Case Mix databases including information on patient sociodemographics, diagnostic information, treatment and service information, and hospital charges.

REPORT MATERIALS
Databook (Excel) Technical Appendix (PDF)

Interactive Dashboard

This interactive dashboard presents analyses on a quarterly basis on measures of ED utilization and visit characteristics at a statewide level and for select analyses at the hospital level. The data in the quarterly updates are preliminary.

(Data through December 2025)

Updated May 28, 2026

Previous Publication Materials

Recommended Links

Case Mix

Access Massachusetts hospital case mix data, including inpatient discharge, emergency department, and outpatient observation datasets, documentation, and data specification manuals.

Read more

Hospital Inpatient Discharge Database (HIDD) Reporting

Find submission requirements and technical resources for Massachusetts acute care hospitals reporting inpatient discharge data to CHIA's case mix database.

Read more

Outpatient Observation Database (OOD) Reporting

Find submission requirements and technical resources for hospitals reporting outpatient observation visit data to CHIA's Outpatient Observation Database.

Read more