Jack S. Huynh, MD
Internal Medicine Physician · San Francisco, CA
Jack S. Huynh, MD is an internal medicine physician with a practice address in San Francisco, California, and NPI 1548334543, issued on Nov 20, 2006. Check the license (California A41781, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jack S. Huynh
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A41781 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1520 Stockton Street, San Francisco, CA 94133
- Phone
- (415) 391-9686
- Enumerated
- Nov 20, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (415) 433-1139
- Medicare enrollment
- Enrolled (PECOS I20090302000485); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1520 Stockton Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Daniel ChanSpecialist1356417349
- Lydia HsuContinuing Education/Staff Development Registered Nurse1114082005
- Peggy HuangDiabetes Educator Registered Nurse1184797003
- Thinn Khaing, M.D.Internal Medicine Physician1396939724
- Sihao Lam, MDPediatrics Physician1528132511
- Lien Luong, MDFamily Medicine Physician1811038912
Verify Jack S. Huynh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A41781Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.8 times the Medicare Part D claims of the average internal medicine physician in 2024
8,882 Medicare Part D claims for 570 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Losartan Potassium985 claims
- Atorvastatin Calcium958 claims
- Amlodipine Besylate912 claims
- Triamcinolone Acetonide366 claims
- Metformin Hcl333 claims
- Metoprolol Succinate310 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.
Bills Medicare through one group practice
- North East Medical ServicesSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jack S. Huynh among 17,696 internal medicine physician records in California
Jack S. Huynh, 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 fileYes · 63% of these records are
- Graduated1981 · median 2004 among the 11,065 with a school on file
- 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).
1,318 internal medicine physician records list a practice address in San Francisco
They are 1,318 of the 38,143 NPPES records with a practice address in San Francisco, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Francisco → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Leila Alpers, M.D.San Francisco, CA 941331881706935
- Kenneth Chan, MDSan Francisco, CA 941331912091919
- Kenneth Chang, MDSan Francisco, CA 941331609832724
- Qingquan Fu, MDSan Francisco, CA 941331578673620
- Judy Hsu, MDSan Francisco, CA 941331043384050
- Thinn Khaing, M.D.San Francisco, CA 941331396939724
- Edward Ko, MDSan Francisco, CA 941331841364841
- Andrea Kung, M.D.San Francisco, CA 941331932105582
Common questions
What is Jack S. Huynh, MD's NPI number?
Jack S. Huynh, MD's National Provider Identifier (NPI) is 1548334543, issued on Nov 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jack S. Huynh, MD located?
The NPPES record lists a practice address at 1520 Stockton Street, San Francisco, CA, 94133. Phone: (415) 391-9686. Providers update this record themselves, so call before visiting.
How can I verify Jack S. Huynh, MD's license?
NPPES lists California license number A41781, 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 Jack S. Huynh, MD prescribe under Medicare Part D?
In 2024, Jack S. Huynh, MD had 8,882 Medicare Part D claims for 570 beneficiaries; 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.