Report Resources
Submission Deadlines
M.G.L. c. 12C, § 10 requires the Center for Health Information and Analysis (“CHIA”) to report on changes over time in Massachusetts health insurance premiums, benefit levels, member cost-sharing, and product design.
CHIA collects this data under Regulation 957 CMR 10.00. The Data Submission Manual provides technical details to assist payers in reporting and filing data. Only payers with at least 50,000 Massachusetts Private Commercial Plan members for the latest quarter as reported in CHIA’s most recently published Enrollment Trends are required to submit.
Links to the Data Submission Manual, Reporting Workbook, new Supplemental Data Reporting, Frequently Asked Questions, and relevant regulations are found under "Report Resources" on the right of this page.
The Health Care Payers Premiums and Claims Data Reporting Workbook (Workbook) must be used for data submission. A Workbook must be completed for each legal entity of a payer and saved according to the following file naming convention: 2025-PremiumsReporting-Carrier Designator-YYYYMMDD.xlsx. (Standardized “Carrier Designator” abbreviations are listed in the “Naming Conventions” Workbook tab.)
Payers are responsible for notifying CHIA of additional legal entities not listed here that may meet filing requirements. In addition to the Workbook, payers should submit a copy (in PDF and Excel format) of their completed Centers for Medicare & Medicaid Services (CMS) Medical Loss Ratio (MLR) Annual Reporting Form for the 2024 MLR Reporting Year no later than Wednesday, September 10, 2025.
Completed Workbooks and MLR Forms should be sent to CHIAData@oliverwyman.com no later than Wednesday, September 10, 2025.
For questions regarding the content of the cost report or problems with submitting your cost report data, email PayerData@chiamass.gov.
General questions can be submitted anytime to CHIAData@oliverwyman.com.
