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Jason Petroske, FSA, MAAA

Consulting Actuary
Brookfield, WI, US

Tel: +1 262 9233692

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Professional Designations

  • Fellow, Society Actuaries
  • Member, American Academy of Actuaries


  • BS, Applied Mathematical Economics, Marquette University

Current Responsibility

Jason is a consulting actuary with the Milwaukee office of Milliman. He joined the firm in 2013.


Jason’s primary area of focus is assisting commercial health plans with pricing, state insurance department rate filings, experience analysis, and financial modeling. He has worked extensively with Affordable Care Act (ACA) regulations and, in particular, the Federal Risk Adjustment program and risk transfer model.

He has led many ACA research initiatives and modeling projects in his time at Milliman, including designing and building the Milwaukee practice’s commercial medical coding improvement tool and the firmwide ACA financial accrual projection model, among others.

Additionally, he has supported various issuers with forecasting and building pro forma financial statements. He has also assisted health plans with their annual statements of actuarial opinion regarding their statutory liabilities.

Before joining Milliman, Jason worked for nearly nine years at a major health insurer in the Milwaukee area. As director of enterprise risk management, he coordinated various analyses and projections for the company’s main business units, such as claims processing, sales, and customer service and retention. His other responsibilities included general experience analysis and building and maintaining the firm’s individual and small group financial forecasting models.


  • When adverse selection isn’t: Which members are likely to be profitable (or not) in markets regulated by the ACA, Milliman Research Report, December 2013
  • Sizing up ACA risk adjustment volitility: How the interplay between risk adjustment and issuer size affects profitability under the ACA, Milliman Research Report, June 2016
  • On second thought: Initial insights from year two of the ACA risk adjustment program, Milliman Research Report, August 2016
  • Taking the EDGE off: Minimize stress while maximizing ACA risk adjustment through EDGE server best practices, Milliman Insight Publication, August 2016
  • The “Risk” of adjustments in 2018 ACA risk adjustment, Milliman Insight Publication, August 2017
  • ACA risk adjustment management: Going all-out, Milliman Insight Publication, December 2017
  • ACA risk adjustment management: Higher “EDGE-ucation", Milliman Insight Publication, December 2017
  • ACA risk adjustment management: Cracking the code, Milliman Insight Publication, December 2017
  • ACA risk adjustment management: Time to keep score, Milliman Insight Publication, December 2017
  • Work at Milliman

    • “I was offered a chance to come in, shake things up, create something."
    Work at Milliman