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

Dr. John Peter Gruen, MD

Individual provider Neurological Surgery Physician · NPI 1194769570

Dr. John Peter Gruen, MD is a Neurosurgery in Los Angeles, California. Graduated from Columbia University College of Physicians and Surgeons in 1986, 40 years ago. Practices with USC Care Medical Group Inc, a 1,371-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
40
Trained at
Columbia University College of Physicians and Surgeons
Licensed in
CA
In the registry since
2006
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

1520 San Pablo St Ste 3800
Los Angeles, CA 90033-5310
Phone: (323) 442-5720
Fax: (323) 442-7543
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Neurological Surgery Physician (primary) Taxonomy 207T00000X · Licence G63324 (CA)

Record details

NPI number1194769570
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 15, 2006
Last updated in NPPESNovember 27, 2023
Certification dateAugust 31, 2020

Medicare enrollment

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

Medicare specialtyNEUROSURGERY
Medical schoolCOLUMBIA UNIVERSITY COLLEGE OF PHYSICIANS AND SURGEONS
Graduated 1986 (40 years in practice)
Group practice Usc Care Medical Group Inc — 1371 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations6 on file with Medicare

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