CHIA Data » Information for Data Submitters: Acute Hospital Case Mix Data

Information for Data Submitters: Acute Hospital Case Mix Data

Report Resources

Submission Deadlines

Quarter
Begin & End Dates

Due
Date
Oct. 1st - Dec. 31st
March 16th
Jan. 1st- March 31st
June 14th
April 1st - June 30th
Sept. 13th
July 1st - Sept. 30th
Dec. 14th

Please Note: Preliminary quarterly Hospital Inpatient Discharge, Emergency Department, and Outpatient Observations submissions are due on the last day of the month following the close of the quarter.

For more information, see Administrative Bulletin 21-04 and Administrative Bulletin 22-01.

Overview

CHIA collects hospital data on patient demographics, diagnoses and procedures, physicians, and charges for each inpatient discharge, outpatient observation stay, and emergency department visit in Massachusetts. Hospitals submit data in accordance with the requirements of the Data Submission Specification Manuals, which set forth the file format, record specifications, data elements, definitions, code tables, and edit specifications for each database. These manuals can be found in the blue box on the right of this page. Hospitals submit inpatient, outpatient observation, and outpatient emergency department data quarterly.

CHIA hosted a webinar on to review the proposed changes to the FY2026 Redline Hospital Outpatient Observation Data Specifications. See the webinar presentation for more information.

Reporting Requirements

The Hospital Case Mix Data Specification Manuals provide information on the data file format, data specifications, data element definitions, and quality standards that data submitters must follow when submitting Case Mix files to CHIA.

Acute hospitals submit their Case Mix data through a CHIA web-based submission platforms. Case Mix data is submitted to CHIA online through CHIA Submissions. If you are a new provider or new user and do not have log in credentials, you must register with CHIA as soon as possible. 

Registration Instructions

New users must register to submit data via CHIA Submissions.

  1. Complete and sign the CHIA Data Reporter User Agreement after reviewing the DRUA instructions. Note that each individual user for an organization must complete the form.
  2. Submit the completed Data Reporter User Agreement to DL-Data-Submitter-HelpDesk@chiamass.gov.
  3. You will be notified when your account is ready to use.

For help with registration, email DL-Data-Submitter-HelpDesk@chiamass.gov or call 617-701-8100 (9am-5pm Monday through Friday).

Contact

Please email Cathy Houston or call (617) 701-8100 regarding either Case Mix Hospital or Behavioral Health Facility submissions.

Related Links

CHIA Regulation and Administrative Bulletin