Enrollment in Health Insurance

Enrollment Trends
(August 2017 Report)

Enrollment Trends monitors health insurance coverage in the Commonwealth of Massachusetts, where coverage is defined by unique Massachusetts residents with primary medical membership in the 13 largest commercial payers, MassHealth (Medicaid), and Medicare. 

The August 2017 edition of Enrollment Trends offers insights into changes in health insurance coverage in Massachusetts from March 2015 through March 2017.

Key Findings from August 2017 Enrollment Trends

  • Over four million Massachusetts residents received their primary, medical health insurance coverage through private commercial insurance from March 2015 through March 2017.

  • The number of individuals purchasing coverage through the MA Health Connector nearly doubled between March 2015 and March 2017, from 124,000 to almost 240,000. Nearly 80% of these enrollees qualified for cost sharing subsidies.

  • Medicare Advantage membership continued to grow at a faster rate than traditional Medicare Fee-for-Service (+7.9% vs. +0.5%) between March 2016 and March 2017.

commerical enrollment by payer August 2017

Please note:

The accompanying databook has additional detail not included in the main report. The report is also accompanied by a technical appendix and MA APCD programming code.

Enrollment Trends is produced using the Massachusetts All-Payer Claims Database, supplemented with additional data from commercial payers, the Massachusetts Health Connector, and the Centers for Medicare and Medicaid Services.

Previous Enrollment Publication Materials

2017 Publications

March 2017

2016 Publications

July 2016

February 2016

2015 Publications

September 2015

  • Annual Report on the Performance of the Massachusetts Health Care System

    CHIA’s Annual Report includes an update on enrollment by payers, market sectors, and product types. See Page 24 of the report for more information.

July 2015

March 2015


Please see the latest Enrollment Trends report for the most accurate data available. Enrollment data is subject to change due to retroactivity or continued specification refinement. Earlier reports (below) are provided for historical reference only.

2014 Publications