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

Maria Estella Castillejos, MD

Specialty

Ophthalmology, Retina Specialist (Ophthalmology)

Languages

English, Spanish

Seeing patients at

  • Gender

    Female

    Licenses

    CA, A37652

    Network Name

    Optum Care Network California

    Hospital affiliations

    Sharp Chula Vista Medical Center,Alvarado Hospital Medical Center,Scripps Mercy Hospital

  • Education

    Medical School

    • Universidad Autonoma De Mexico

      1933

    Residency

    • Jewish Hospital Medical Center

      Ophthalmology

      1975

    Internship

    • Moncton Hospital

      1971

    Fellowship

    • Harvard Medical School

      1979

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