Robert Neil Horowitz, MD
Internal Medicine Physician · San Jose, CA
Robert Neil Horowitz, MD is an internal medicine physician with a practice address in San Jose, California, and NPI 1588628812, issued on Apr 13, 2006. Check the license (California G45180, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Robert Neil Horowitz
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G45180 CA
Self-reported in NPPES; status is on the state search - Practice location
- 500 Tully RD, San Jose, CA 95111
- Phone
- (408) 494-7422
- Enumerated
- Apr 13, 2006
- Record last updated
- Sep 11, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicaid ID
- 00G451800 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 500 Tully RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Robert Neil Horowitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G45180Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Robert Neil Horowitz among 17,696 internal medicine physician records in California
Robert Neil Horowitz, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% 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, 56% newer
- In a Medicare fileNo · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2007 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
428 internal medicine physician records list a practice address in San Jose
They are 428 of the 20,925 NPPES records with a practice address in San Jose, and 17,696 internal medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 17,696 in California → Every provider in San Jose → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Dan Le, MDSan Jose, CA 951111962468314
- Peter Mazonson, MDSan Jose, CA 951111811953391
- Jamie Nguyen, MDSan Jose, CA 951111053442020
- Sara Pinkel, MDSan Jose, CA 951111629138474
- Don Tran, M.D.San Jose, CA 951111881688950
- Khanh Tran, MDSan Jose, CA 951111124093133
Common questions
What is Robert Neil Horowitz, MD's NPI number?
Robert Neil Horowitz, MD's National Provider Identifier (NPI) is 1588628812, issued on Apr 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert Neil Horowitz, MD located?
The NPPES record lists a practice address at 500 Tully RD, San Jose, CA, 95111. Phone: (408) 494-7422. Providers update this record themselves, so call before visiting.
How can I verify Robert Neil Horowitz, MD's license?
NPPES lists California license number G45180, 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.