Benjamin J. Diederich

FSA,MAAA

Principal and Consulting Actuary

Seattle, WA, US

Ben Diederich is a principal and consulting actuary specializing in healthcare consulting in the Seattle office of Milliman. He joined the firm in 2006.

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Experience

Ben's actuarial experience includes health policy analysis, Medicaid rate setting and actuarial certification, and a variety of activities for public sector employees including value based purchasing through accountable care organizations, budget modeling, procurement, and both portfolio-wide and self-insured plan management functions. With his main focus on public sector clients, Ben also has experience with health plans in the development of commercial rate filings for individual, small, and large groups, Medicare Advantage bid development, and statements of actuarial opinion. His current client activities include:

Development and support of Value Based Purchasing Accountable Care Models
Unit Cost and Risk Standardized Health Plan comparisons
MARA Risk Adjustment customization for Medicaid
Actuarial rate certification for Medicaid and commercial products
Population analytics of utilization and cost
Procurement evaluation support for both insured and vendor administrative programs
Pricing and rate development
Budget modeling
Preparation of regulatory rate filings
Provider Unit Cost Evaluations in relation to Medicare
Actuarial input for accountable care program design

Publications and Presentations

How Employers can address plan selection bias with risk adjustment, 18 October 2019.
Operation of a health exchange within the PPACA, 17 September 2010.
Managing Employee Health Care Costs - PEBB and OEBB, 3 December 2019.

Professional Designations

Member, American Academy of Actuaries, 1999
Fellow, Society of Actuaries (FSA), 2006

Education

Bachelor of Science, Mathematics (summa cum laude), Oregon State University, Corvallis, Oregon

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Publications

Read their latest work

Article

Universal health care system design: Cost of care for select populations under existing benefit designs

06 March 2025 - by Benjamin J. Diederich, Mark Franklin, Menko Ypma, Peter Hallum

We present the cost of care for select populations under three existing benefit designs for the Washington State Health Care Authority.

Video

Proxy Pricing and Medicare Pricing Gaps

08 August 2024 - by Charlie Mills, Benjamin J. Diederich, David C. Lewis, Bill Alto

In this webinar, we will help you understand Percent of Medicare and its role in the commercial healthcare market and provide case studies.

Video

Percent of Medicare Caps and Guarantees: How it can work for you

08 August 2024 - by Charlie Mills, Benjamin J. Diederich, David C. Lewis, Bill Alto, Mich’l P. Needham (Washington State Health Care Authority)

Our experts discuss what falls out when using Medicare fee schedules.

Article

How employers can address plan selection bias with risk adjustment

18 October 2019 - by Benjamin J. Diederich, Will Fox, Brent Jensen

Employers should adjust health plan options for morbidity in order to reduce the selection bias.

Article

Operation of a health exchange within the PPACA

17 September 2010 - by Benjamin J. Diederich, Stacey V. Muller

What are the main operational considerations relevant to the creation of state health insurance exchanges?

Benjamin J. Diederich

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Experience

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Read their latest work

Universal health care system design: Cost of care for select populations under existing benefit designs

Proxy Pricing and Medicare Pricing Gaps

Percent of Medicare Caps and Guarantees: How it can work for you

How employers can address plan selection bias with risk adjustment

Operation of a health exchange within the PPACA

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Benjamin J. Diederich

Experience

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