Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Maria O Ortiz Castillo, MD

Individual provider Internal Medicine Physician · NPI 1811298516

Maria O Ortiz Castillo, MD is an Internal Medicine in Pasadena, California. Graduated from University of California, Geffen School of Medicine in 2010, 16 years ago. Practices with City of Hope Medical Foundation, a 959-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
16
Trained at
University of California, Geffen School of Medicine
Licensed in
CA
In the registry since
2010
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

100 W California Blvd
Pasadena, CA 91105-3010
Phone: (626) 397-8300
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 1500 Duarte Rd, Duarte, CA 91010-3012 — (626) 256-4673
  • 1414 S Grand Ave Ste 100, Los Angeles, CA 90015 — (213) 481-2200
  • 880 S Atlantic Blvd, Monterey Park, CA 91754-4700 — (626) 281-6969

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence A121001 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence A121001 (CA)

Record details

NPI number1811298516
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedNovember 11, 2010
Last updated in NPPESJuly 15, 2026
Certification dateJuly 15, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF CALIFORNIA, GEFFEN SCHOOL OF MEDICINE
Graduated 2010 (16 years in practice)
Group practice City Of Hope Medical Foundation — 959 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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