Databases - CHIA

CHIA collects detailed financial and patient-level data from Massachusetts payers and providers. Data submissions are normalized to ensure completeness and validity, enabling accurate cross-payer and cross-provider research and analyses.

CHIA’s rich data resources are available to state agencies, providers, payers, and health care researchers seeking data for health research in the public interest.

Learn about the Massachusetts All Payer Claims Database, including what data is collected, how to request access, and how to submit claims data to CHIA.

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

CHIA's Electronic Health Record Database includes quarterly data from about 70 acute care hospitals across Massachusetts, focusing on key patient information, health risk factors, and selected clinical and visit information.

CHIA’s aggregate payer data collects information from commercial health insurance plans in Massachusetts to support a better understanding of health care costs, spending trends, and how care is delivered across the state.

Provider financial and cost reports are submitted from acute hospitals, affiliated physician groups, hospital health systems, hospitals, skilled nursing facilities, resident care facilities, and other providers.