Gary Alan Pasternak, MD
Internal Medicine Physician · San Mateo, CA
Gary Alan Pasternak, MD is an internal medicine physician with a practice address in San Mateo, California, and NPI 1194820688, issued on Sep 13, 2006. Check the license (California G55926, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gary Alan Pasternak
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G55926 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1670 South Amphlett Blvd., San Mateo, CA 94403
- Phone
- (650) 554-1000
- Enumerated
- Sep 13, 2006
- Record last updated
- Dec 17, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (650) 554-1018
- Medicaid ID
- 00G559260 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Gary Alan Pasternak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G55926Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
13 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Gary Alan Pasternak among 17,696 internal medicine physician records in California
Gary Alan Pasternak, 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. 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 fileNo · 63% of these records are
- Record last updated2010 · 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).
44 internal medicine physician records list a practice address in San Mateo
They are 44 of the 3,909 NPPES records with a practice address in San Mateo, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Mateo → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Richard EhlingSan Mateo, CA 944031124187950
- Susan Ehrlich, MDSan Mateo, CA 944031942379474
- Indu Fotedar, MDSan Mateo, CA 944031508960766
- Evelyn Haddad, M.D.San Mateo, CA 944031295936755
- Grace Hassid, MDSan Mateo, CA 944031700957099
- Susan Joseph, MDSan Mateo, CA 944031801960497
- Chester Kunnappilly, MDSan Mateo, CA 944031437220704
- Jennifer Lin, MDSan Mateo, CA 944031336342708
Common questions
What is Gary Alan Pasternak, MD's NPI number?
Gary Alan Pasternak, MD's National Provider Identifier (NPI) is 1194820688, issued on Sep 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gary Alan Pasternak, MD located?
The NPPES record lists a practice address at 1670 South Amphlett Blvd., San Mateo, CA, 94403. Phone: (650) 554-1000. Providers update this record themselves, so call before visiting.
How can I verify Gary Alan Pasternak, MD's license?
NPPES lists California license number G55926, 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.
How much does Gary Alan Pasternak, MD prescribe under Medicare Part D?
In 2024, Gary Alan Pasternak, MD had 13 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.