About

Dr. Castillo is passionate about LGBTQ medicine and strives to be an outspoken, visible leader within his community. He has a special interest in gender-affirming hormone therapy and the prevention of sexually transmitted infections (STIs). His practice includes specific time every week reserved for transgender patients to seek hormone replacement therapy (HRT) and preventative medicine in a caring and accepting environment. 

Dr. Castillo serves as Director of LGBTQ Health and Associate Program Director, Family Medicine Residency Program at MemorialCare Long Beach Medical Center. He is committed to training physicians who are mindful of social determinants of health, including socioeconomic status, education level, and health literacy—ensuring that all patients receive the quality care they deserve. 

In his free time, Dr. Castillo loves singing, making music, cooking, trying new restaurants, trivia and crossword puzzles. He is also an avid fan of Bay Area sports teams. He is fluent in English and Tagalog and speaks intermediate Spanish.

Languages

English

Provider Specialty

Family Medicine, Primary Care

Areas of Care

Education

Medical School

Touro University College of Osteopathic Medicine

2017

Internship/Residency - Family Medicine

Long Beach Medical Center

2020

Locations & Affiliations

Locations

Insurance

Please consult your health care provider or health plan for the most accurate information about your health plan’s coverage of a particular health care service offered at a MemorialCare facility. Learn more about our Accepted Health Plans.

Patient Reviews

5.0 out of 5
(209 Ratings)
Oct 8, 2026
Ekua H.
Dr Castillo listens and remembers your history, is thorough and very knowledgeable. Has excellent bedside manner. He is a gem and I would recommend him to anyone looking for a skilled clinician.
Oct 8, 2026
George F.
Appreciated the kind discussion and care for my health
Oct 1, 2026
Nicholas G.
Sep 30, 2026
Laurie B.
Love ?? Memorial Care
Sep 13, 2026
Nicolette A.
I have been a patient of Dr. Castillo for over five years, and I cannot recommend him highly enough. He is incredibly understanding and genuinely invested in helping his patients thrive--a quality that feels truly rare in the medical field today. I actually look forward to my check-ups and know I am in great hands whenever I have health concerns. I feel very fortunate to have him as my doctor.
Sep 9, 2026
Jane C.
Enormously professional and knowledgeable, with a deep sensitivity for marginalized communities
Sep 9, 2026
George Z.
Sep 4, 2026
Meredith P.
Very professional, explained plan clearly
Sep 4, 2026
Yihsiang L.
Sep 4, 2026
Florentina C.

Source: Reviews are aggregated from third-party review sites such as Facebook, Google, HealthGrades, RepuGen, Vitals, WebMD, and Yelp.