Behavioral Health Facilities Case Mix Data

Report Resources

Submission Deadlines

Begin & End Dates



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


CHIA collects Behavioral Health facility data, from participating providers, on patient demographics, diagnoses and procedures, physicians, and charges for each inpatient discharge in Massachusetts. Facilities submit data in accordance with the requirements of the Behavioral Health Inpatient Data Submission Specification Manual, which sets forth the file format, record specifications, data elements, definitions, code tables, and edit specifications. A link to their location is found in the blue box on the right side of this page. Facilities will submit data on a quarterly basis, following a standard hospital fiscal year schedule (October 1 – September 30).

Filing Application

Behavioral Health facilities will submit their Case Mix data through CHIA Submissions, CHIA’s web-based transaction service.




Completed forms may be submitted to For more information about CHIA’s interfaces (e.g. INET, CHIA Submissions), please see INET and CHIA Submissions Questions & Answers.

CHIA occasionally hosts Case Mix Technical Assistance Group (TAG) webinars where hospitals or facilities may ask questions about their Provider data submissions. On the right of this page, you can find information on how to participate in future webinars and view presentation materials from more recent TAG sessions.


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