Reports on Massachusetts Acute Hospital Case Mix Database

Massachusetts Acute Care Hospital
Case Mix Reporting

Hospital Inpatient Discharge Reporting
Emergency Department Reporting
Outpatient Observation Reporting

Massachusetts Hospitals Main Web Page
About Case Mix Databases

Under state law, CHIA maintains a database of all Massachusetts acute care hospitals encounters. These databases, collectively known as Case Mix, capture each inpatient admission, emergency department visit, and outpatient observation stay along with the medical reason for the visit, procedures and services provided, charges incurred, visit duration and patient demographics.

This customizable report series includes overall and individual hospital utilization patterns, patient demographics, and discharge or visit characteristics. The data is through June 2025.

For general information about Case Mix including data governance, data submissions, data documentation, and use cases, see CHIA's Case Mix Data web page.

To receive a Case Mix data extract for project research, please refer to the Government Agency or Non-Government Agency data application web pages.