Reports on Massachusetts Acute Hospital Case Mix Database

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 and includes data through September 2024. See:

• Inpatient Discharge Data

• Emergency Department Data

• Outpatient Observation Data
   

For further information about the Case Mix Database including information about data governance, data submissions, data requests and use cases, see CHIA's Case Mix Data web page.