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Mary Dawn De Castro Castro, MD

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My specialty:
Family Medicine

My provider affiliation:
Kaiser Permanente provider

I speak: English, Tagalog

My gender: Female

Where I practice

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  • Emergency service
  • Urgent care services
  • After-hours services
  • Pharmacy services
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About me

Hi! Thank you for visiting my Web page. Through this, I hope to let you get to know a little about me and the things that help me thrive.


I’m a family physician who graduated from the University of Santo Tomas in the Philippines, where I was born and raised. When I was growing up, I always knew that I wanted to become a doctor. I came from a close-knit family and feel very blessed to have supportive parents that inspire me to work hard and do well. In 2004, my husband and I moved to the United States and stayed in Michigan, where we lived for three years. I finished my residency in Grand Rapids, Michigan, in 2007. Prior to joining Kaiser Permanente, I worked as a lead physician for a nonprofit community clinic in Moreno Valley for over five years. I’m proud to be providing care at Kaiser Permanente and to be working alongside my colleagues as we assist in providing care to our members.

About my practice

Medicine, as a career, has helped me to connect with people by way of listening. I enjoy my work as a physician because of the many opportunities I have to make a positive impact on the lives of others. I treat my patients like my own family. Being away from my family taught me to value my relationship with my patients. Healthy living and preventive care are the best ways to stay well, but I’m also here to help whenever you get sick. I strongly believe in the importance of empowering my patients by educating them and getting them involved in their own health care.

How I thrive

I believe in the balance of work and play. Retail therapy is what I enjoy best! During my free time, I catch up on the latest news and chat for hours with my parents and siblings. My husband and I also love meeting up with friends and enjoy traveling together.

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My office

Languages spoken by medical staff

Help is available in your language. Learn more.

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My provider type

Physicians and Surgeons

Medical groups and plans

Southern California Permanente Medical Group

List Header Plans Accepted
  • Exclusive Provider Organization (EPO)
  • HMO
  • Medi-Cal Managed Care
  • Point-of-Service Plan (POS)
  • Senior Advantage/Medicare Cost
Family Practice Department
12815 Heacock St, Moreno Valley, CA 92553

Contact information

  • Advice/appointments/cancellations/messages
  • 1-833-574-2273 (1-833-KP4CARE) (toll free)
  • California Relay Service
  • 711 (TTY for the hearing/speech impaired)

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My training, certifications and licensing

Medical school

Santo Tomas University Hospital
Manila , Philippines

Board certification

Family Medicine

American Board of Family Medicine

Medical training


Family Medicine

Grand Rapids Area Medical Education Center
Grand Rapids , MI


Family Medicine

Grand Rapids Area Medical Education Center
Grand Rapids , MI

Joined Permanente Medical Group


Active license information

License number


License type


License issuing state


National Provider Identifier (NPI)

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My hospitals

This information is not available at this time.

To find:

  • a provider's office hours, search our facility directory
  • providers in your plan or accepting new patients, call 1-800-464-4000 (toll free) or 711 (TTY for the hearing/speech impaired)

The information in this online directory is updated periodically. The availability of physicians, hospitals, providers, and services may change. Information about a practitioner is provided to us by the practitioner or is obtained as part of the credentialing process. If you have questions, please call us at 1-800-464-4000 (toll free). For the hearing and speech impaired: 1-800-464-4000 (toll free) or TTY 711 (toll free). You can also call the Medical Board of California at 916-263-2382, or visit their website.

We want to speak to you in the language that you’re most comfortable with when you call or visit us. Qualified interpreter services, including sign language, are available at no cost, 24 hours a day, 7 days a week during all hours of operations at all points of contact. We do not encourage the use of family, friends or minors as interpreters. Only the services of interpreters and qualified staff are used to provide language assistance. These may include bilingual providers, staff, and healthcare interpreters. In-person, telephone, video, and alternative modes of communication are available. Learn more about interpreter services

If you would like to report an error in provider or facility information, please contact us.

Kaiser Permanente enrollees have full and equal access to covered services, including enrollees with disabilities as required under the Federal Americans with Disabilities Act of 1990 and Section 504 of the Rehabilitation Act of 1973.

Kaiser Permanente uses the same quality, member experience, or cost-related measures to select practitioners and facilities in Marketplace Silver-tier plans as it does for all other Kaiser Foundation Health Plan (KFHP) products and lines of business.The measures may include, but are not limited to, HEDIS/CAHPS performance, member/patient complaints, patient safety scores, hospital quality measures, and geographic need. Members enrolled in KFHP Marketplace plans have access to all professional, institutional and ancillary health care providers who participate in KFHP plans’ contracted provider network, in accordance with the terms of members’ KFHP plan of coverage. All Kaiser Permanente Medical Group physicians and network physicians are subject to the same quality review processes and certifications.
Kaiser Permanente uses the same geographic distribution consideration to select hospitals in Marketplace plans as it does for all other Kaiser Foundation Health Plan (KFHP) products and lines of business. Accessibility of medical offices and medical centers in this directory: All Kaiser Permanente facilities are accessible to members.


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