Gary S. Firestein, M.D.
Internal Medicine Physician · San Diego, CA
Gary S. Firestein, M.D. is an internal medicine physician with a practice address in San Diego, California, and NPI 1699790808, issued on Jul 12, 2006. Check the license (California G46824, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gary S. Firestein
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G46824 CA
Self-reported in NPPES; status is on the state search - Practice location
- 200 W Arbor Dr, San Diego, CA 92103
- Phone
- (858) 822-0480
- Enumerated
- Jul 12, 2006
- Record last updated
- Sep 11, 2025
- Medicaid ID
- 00G468240 CA
- Medicare enrollment
- Enrolled (PECOS I20101025000893); accepts Medicare assignment
- Medical or professional school
- Johns Hopkins University School Of Medicine, 1980
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
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Verify Gary S. Firestein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G46824Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Regents OF The University OF CaliforniaSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gary S. Firestein among 17,696 internal medicine physician records in California
Gary S. Firestein, M.D. 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. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1980 · median 2004 among the 11,065 with a school on file
- Record last updated2025 · 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).
961 internal medicine physician records list a practice address in San Diego
They are 961 of the 52,937 NPPES records with a practice address in San Diego, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Diego → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Hamid Amjadi, DOSan Diego, CA 921031700861333
- Donald Brandon, M.D.San Diego, CA 921031740272467
- Daniel Bressler, M.D.San Diego, CA 921031700887726
- Eric Dahms, M.D.San Diego, CA 921031306808464
- Janette Gray, M.D.San Diego, CA 921031295721876
- San Hsieh, MDSan Diego, CA 921031851388847
- Arthur Kingsbury, M.D.San Diego, CA 921031144216284
- Timothy O'Neill, M.D.San Diego, CA 921031831172295
Common questions
What is Gary S. Firestein, M.D.'s NPI number?
Gary S. Firestein, M.D.'s National Provider Identifier (NPI) is 1699790808, issued on Jul 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gary S. Firestein, M.D. located?
The NPPES record lists a practice address at 200 W Arbor Dr, San Diego, CA, 92103. Phone: (858) 822-0480. Providers update this record themselves, so call before visiting.
How can I verify Gary S. Firestein, M.D.'s license?
NPPES lists California license number G46824, 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. Medicare files from data.cms.gov. 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.