Payer Data Reporting: Premiums Data

Overview

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.

Reporting Requirements

Links to the Data Submission Manual, Premiums Reporting Workbook, Supplemental Data Reporting, Frequently Asked Questions, and relevant regulations are found under "Report Resources" on the right of this page.

There are two (2) Excel workbooks that must be used for data submission as follows: 

• The Health Care Payers Premiums and Claims Data Reporting Workbook (Premiums Workbook). A Premiums Workbook must be completed for each legal entity of a payer and saved according to the following file naming convention: 2026-PremiumsReporting-Carrier Designator-YYYYMMDD.xlsx. (Standardized “Carrier Designator” abbreviations are listed in the “Naming Conventions” Premiums Workbook tab.) Payers are responsible for notifying CHIA of additional legal entities not listed here that may meet filing requirements.

• The Supplemental Data Reporting Workbook (Supplemental Workbook). A Supplemental Workbook must be completed for each legal entity of a payer and saved according to the following file naming convention: 2026-Supplemental-Data-Reporting-Carrier Designator-YYYYMMDD.xlsx. (Standardized “Carrier Designator” abbreviations are listed in the “Naming Conventions” Supplemental Workbook tab.) Payers are responsible for notifying CHIA of additional legal entities not listed here that may meet filing requirements. 

In addition to the Premiums and Supplemental Workbooks, 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 2025 MLR Reporting Year.

Completed Premiums Workbooks and MLR Forms should be sent to CHIAData@oliverwyman.com no later than Wednesday, September 9, 2026.

Completed Supplemental Workbooks should be sent to CHIAData@oliverwyman.com no later than Wednesday, September 23, 2026. 

Contact

For questions regarding the content of the Workbooks or problems with submitting your premiums and supplemental data, email PayerData@chiamass.gov.

General questions can be submitted anytime to CHIAData@oliverwyman.com.

Related Links

CHIA Regulations and Administrative Bulletins