Informational

Data use:

We use cookies and similar tools to make your use of this website easy and to keep it working properly. We may share data about you and how you use the site with third parties, such as analytics and marketing partners. Learn more in our Privacy Policy and Terms of Use. By continuing to use the site, you agree to this.

Health care

We provide affordable and personalized care

How can we help?

Helpful links

Understanding coughs: Types, causes and treatments

More articles

Financial

Accounts to help you save and pay for health care expenses

How can we help?

Helpful links

  • Resources

    Find contribution limits, savings tools, calculators and eligible expenses

  • Account support

    Find contact information and frequently asked questions

Tax season resources

Get ready for HSA tax season

If you used an HSA this year, the HSA Tax Center offers general information about contributions, eligible expenses and commonly used tax forms — all in one place.

Visit the HSA Tax Center

Pharmacy

We make it easy to get medications you need, when and where you need them

How can we help?

Helpful links

  • Optum Rx

    For people with pharmacy insurance benefits through Optum Rx

  • Track orders

    Track your home delivery and specialty order

  • Pharmacy support

    Find contact information and answers to frequently asked questions

Mobile app

Optum Rx on the go

Request refills, track order status, manage billing information and much more.

Download on the App StoreGet it on Google Play

Mary Fredenberg, MD

Specialty

Dermatology

Languages

English, Spanish

Seeing patients at

  • Gender

    Female

    Board certifications

    American Board of Dermatology

    Licenses

    AZ, 16095

    Employed or contracted

    Contracted

    Network Name

    OptumCare Network of Arizona

    NPI

    1134140999

  • Education

    Medical School

    • University Of Arizona College Of Medicine

      Tucson, AZ

    Residency

    • Rush-Presby-St Lukes Medical Center

      Chicago, IL

© 2026 Optum, Inc. All rights reserved. Stock photos used.