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

Leslie Graustark Oesterich

Individual provider Internal Medicine Physician · NPI 1245518422

Leslie Graustark Oesterich is an Internal Medicine in Torrance, California. Graduated from University of California, Geffen School of Medicine in 2011, 15 years ago. Practices with Permanente Medical Group Inc, a 10,941-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
15
Trained at
University of California, Geffen School of Medicine
Licensed in
CA
In the registry since
2011
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Practice location Address checks out

1000 W Carson St Box 400
Torrance, CA 90509
Phone: (310) 222-2401
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence A125675 (CA)

Record details

NPI number1245518422
Entity typeIndividual (Type 1)
GenderFemale
Sole proprietorYes
NPI enumeratedJuly 22, 2011
Last updated in NPPESFebruary 11, 2022

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 2011 (15 years in practice)
Group practice Permanente Medical Group Inc — 10941 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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