Matt Mraz

FSA, MAAA

Senior Consulting Actuary

Chicago, IL, US

Main +1 312 726 0677 | Office +1 262 641 3555

Matt Mraz is a senior consulting actuary with the Chicago office of Milliman. He joined the firm in 2013.

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Experience

Matt provides financial and strategic risk management support to the insurance and healthcare industries. He assists various entities, including insurance companies, health plans, hospital systems, employers, and professional associations / trusts. Matt’s core area of expertise is the group and individual commercial health insurance markets, with a specific focus on issues related to the Patient Protection and Affordable Care Act (ACA). Matt helps clients in the commercial market with pricing and filing efforts, health care reform analyses, financial and strategic risk management, underwriting, product development, provider contract negotiations, and other actuarial projections. He assists with the pricing and filing of individual and small group ACA products since 2015 in multiple states. His insurance experience also includes risk adjustment optimization, valuation of reserves, claims auditing, large group rate filing assistance, and annual actuarial certifications. Matt assisted in the design and creation of projection models supporting the Milliman Pandemic Modeling Suite, which helped quantify the potential range of financial effects on patients, payers, and providers resulting from COVID-19. Matt is also a core member of the commercial market research segment within his practice, spearheading the creation and ongoing development of several ACA market intelligence tools. These tools help to identify ACA market strategic opportunities by leveraging competitive intelligence derived from CMS public use files, statutory filings, and Milliman’s proprietary data sources.

Publications and Presentations

ACA market insights derived from 2024 Unified Rate Review Templates. Milliman Report, May 2024.
Hospital payments for COVID-19 inpatient treatment: An analysis of inpatient claims data. Milliman White Paper, May 2021.
How much are hospitals paid for inpatient COVID-19 treatment? Milliman Report, June 2020.

Professional Designations

Fellow, Society of Actuaries
Member, American Academy of Actuaries

Education

BBA, Actuarial Science / Risk Management and Insurance / Finance and Investment Banking (Triple Major), University of Wisconsin-Madison

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Publications

Read their latest work

Article

2026 ACA premium landscape: What health insurers need to know—and do—now

11 December 2025 - by Matt Mraz, Kenneth Laskowski, Barbara R. Collier

The expiration of enhanced ACA subsidies resets market dynamics, reshaping enrollment patterns and risk pools across the individual market.

Article

Quantifying the value of ACA premium subsidy enhancements set to expire in 2026

18 September 2025 - by Matt Mraz, Kenneth Laskowski

Expiration of ACA premium subsidy enhancements: Stakeholders face a highly complex environment as they finalize 2026 rate filings.

Article

Analyzing the ACA market landscape: Key insights from 2025 rate submissions

01 May 2025 - by Matt Mraz, Sarah Marion

We reviewed the latest premium rate submissions, issuer participation, and claims assumptions shaping the ACA landscape for 2025.

Article

ACA market insights derived from 2024 Unified Rate Review Templates

21 May 2024 - by Matt Mraz, Sarah Marion

We offer some key ACA market insights, gleaned from Unified Rate Review data released by the Centers for Medicare and Medicaid Services.

Article

Hospital payments for COVID-19 inpatient treatment: An analysis of inpatient claims data

13 May 2021 - by Emma Kramer, Carol Bazell, Matt Mraz

Our analysis of inpatient claims data shows large variations in hospital payments for COVID-19 inpatient treatment in 2020.

Article

How much are hospitals paid for inpatient COVID-19 treatment?

22 June 2020 - by Carol Bazell, Emma Kramer, Matt Mraz, Susan Silseth

This report presents the authors’ estimates of the 2020 national average hospital per-admission payments for COVID-19 hospitalizations for patients covered by commercial, Medicaid, and Medicare fee-for-service sources of insurance coverage.

Experience

Matt Mraz

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Experience

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Read their latest work

2026 ACA premium landscape: What health insurers need to know—and do—now

Quantifying the value of ACA premium subsidy enhancements set to expire in 2026

Analyzing the ACA market landscape: Key insights from 2025 rate submissions

ACA market insights derived from 2024 Unified Rate Review Templates

Hospital payments for COVID-19 inpatient treatment: An analysis of inpatient claims data

How much are hospitals paid for inpatient COVID-19 treatment?

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Matt Mraz

Experience

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