John Peter Gruen, M.D.
Neurological Surgery Physician · Los Angeles, CA
John Peter Gruen, M.D. is a neurological surgery physician with a practice address in Los Angeles, California, and NPI 1194769570, issued on Jun 15, 2006. Check the license (California G63324, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Peter Gruen
- Credential
- M.D.
- Primary taxonomy
- Neurological Surgery Physician 207T00000X
- License number
- G63324 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1520 San Pablo St, Los Angeles, CA 90033
- Phone
- (323) 442-5720
- Enumerated
- Jun 15, 2006
- Record last updated
- Nov 27, 2023
- Fax
- (323) 442-7543
- Entity
- Type 1 · individual
8 nearest neurological surgery physician records → All 929 in California → Look up another NPI →
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Verify John Peter Gruen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G63324Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John Peter Gruen among 929 neurological surgery physician records in California
John Peter Gruen, M.D. is one of 929 neurological surgery physician records with a practice address in California. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 62% newer
- In a Medicare fileNo · 77% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2023 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207T00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neurological Surgery Physician providers in California
There are 929 neurological surgery physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 929 in California → Every provider in Los Angeles → Neurological Surgery Physician nationwide →
The 8 neurological surgery physician records with the nearest ZIP codes
- Arun Amar, MDLos Angeles, CA 900331447348032
- Michael Apuzzo, M.D.Los Angeles, CA 900331720027501
- Frank Attenello, M.D., M.S.Los Angeles, CA 900331386818227
- Thomas Chen, M.D., PHDLos Angeles, CA 900331225071509
- Steven Giannotta, M.D.Los Angeles, CA 900331114978871
- Patrick Hsieh, MDLos Angeles, CA 900331942405956
- Charles Liu, M.D., PHDLos Angeles, CA 900331568406080
- John Liu, MDLos Angeles, CA 900331235161449
Common questions
What is John Peter Gruen, M.D.'s NPI number?
John Peter Gruen, M.D.'s National Provider Identifier (NPI) is 1194769570, issued on Jun 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Peter Gruen, M.D. located?
The NPPES record lists a practice address at 1520 San Pablo St, Los Angeles, CA, 90033. Phone: (323) 442-5720. Providers update this record themselves, so call before visiting.
How can I verify John Peter Gruen, M.D.'s license?
NPPES lists California license number G63324, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.