Case Mix Data


Steps to Request the Data


Government
entities



Non-Government
entities


Case Mix Current Release Documentation 


Hospital Inpatient Discharge Database (HIDD)

Emergency Department Database (ED)

Outpatient Observation Database (OOD)

  • Documentation Manual (PDF) | Word (Coming soon!)
  • Codebook (PDF) | Excel (Coming soon!)

 

User Support / Contact Us


MA APCD / Case Mix
User Workgroup




casemix.data@state.ma.us
(Please include your IRBNet Number and/or name of PI, if a current data user)

Information for Data Submitters

 


The Massachusetts Acute Hospital Case Mix Database is a database comprised of:

  • Hospital Inpatient Discharge Database (HIDD)
  • Outpatient Observation Database (OOD)
  • Emergency Department Database (ED)

 

Acute Hospital Case Mix data includes case specific, diagnostic discharge data that describe socio-demographic characteristics of the patient, the medical reason for the admission, treatment and services provided to the patient, the duration and status of the patient's stay in the hospital, and the full, undiscounted total and service-specific charges billed by the hospital to the general public.

This patient-level data supports the analyses of such issues as preventable hospitalizations, hospital market analysis, alternative care settings, the patient care continuum, and comparative costs and outcomes in acute care hospitals.  To learn more about how Case Mix data is used, view recent applications for Case Mix data that CHIA has received from researchers and other entities. 

Case Mix data includes hospital inpatient data, outpatient observation data, and hospital outpatient emergency department data.

 

Inpatient Discharge Database 

The Hospital Inpatient Discharge Database (HIDD) contains comprehensive patient-level information including socio-demographics, clinical data, and charge data. It is used to establish reasonable and adequate rates, to enable hospitals to be grouped for comparing costs, to assist in the formulation of health care delivery and financing policy, and to assist in the provision and purchase of health care services. For more information about this data, please see the documentation manual.

 

Outpatient Observation Database 

The Outpatient Hospital Observation Discharge Database (OOD) contains comprehensive patient-level information, including socio-demographics, clinical data, and charge data. The OOD is used by hospitals, strategic planners, policy makers, researchers, and program evaluators to establish payment rates and to inform health care policy development and public health studies. For more information about this data, please see the documentation manual.

 

Emergency Department Database 

The Outpatient Emergency Department (ED) Database contains patient demographics, clinical characteristics, services provided, charges, and hospitals and practitioner information, as well as mode of transport. The ED Database contains data elements that are similar to those contained in the inpatient and observation stay databases, with some additions relevant to the ED setting. For more information about this data, please see the documentation manual.

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