Skip to main content

Health care

We provide affordable and personalized care

How can we help?

Helpful links

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.

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

Mark Chung-Hsun Tsai, MD

Please contact to confirm appointment availability

Please contact to confirm appointment availability

Specialty

Internal Medicine

Languages

English, Mandarin

Seeing patients at

  • About Mark Chung-Hsun Tsai, MD

    Mark Tsai, MD, is board certified in internal medicine. Dr. Tsai earned his medical degree from the University of Pittsburgh School of Medicine in Pennsylvania. He completed his internship and residency at Ronald Reagan UCLA Medical Center. Dr. Tsai encourages his patients to take charge of their health and well-being. In his spare time, he enjoys reading. In addition to speaking English, Dr. Tsai has a basic command of Mandarin and is familiar with Spanish medical terms.

    Gender

    Male

    Board certifications

    American Board of Internal Medicine

    Licenses

    CA, A81875

    Employed or contracted

    Contracted

    Network Name

    Optum Care Network California

    NPI

    1225033111

    Hospital affiliations

    UCI Health Lakewood,Promise Hospital of East Los Angeles

  • Medical School

    • University of Pittsburg School of Medicine

      1997

    Residency

    • VA Greater Los Angeles Healthcare System - West Lo

      Internal Medicine

      2004

    Internship

    • Ucla Medical Center

      2001