Isabelle Nguyen, MD
Internal Medicine Physician · San Francisco, CA
Isabelle Nguyen, MD is an internal medicine physician with a practice address in San Francisco, California, and NPI 1154920833, issued on Oct 22, 2020. Check the license (California A188101, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Isabelle Nguyen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A188101 CA
Self-reported in NPPES; status is on the state search - Practice location
- 900 Hyde St, San Francisco, CA 94109
- Phone
- (415) 353-6368
- Enumerated
- Oct 22, 2020
- Record last updated
- Jun 4, 2026
- Fax
- (415) 353-6360
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 900 Hyde St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Isabelle Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A188101Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
27 Medicare Part D claims for 17 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
Industry payments in 2024: $176.34
5 payments; by number, the most common kind was food and beverage; the largest payer was Regeneron Healthcare Solutions, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Isabelle Nguyen among 17,696 internal medicine physician records in California
Isabelle Nguyen, 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 2020, is newer than 89% of them.
- NPI issued2020 · 89% of these records are older, 8% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2026 · 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 →
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Common questions
What is Isabelle Nguyen, MD's NPI number?
Isabelle Nguyen, MD's National Provider Identifier (NPI) is 1154920833, issued on Oct 22, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Isabelle Nguyen, MD located?
The NPPES record lists a practice address at 900 Hyde St, San Francisco, CA, 94109. Phone: (415) 353-6368. Providers update this record themselves, so call before visiting.
How can I verify Isabelle Nguyen, MD's license?
NPPES lists California license number A188101, 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 Isabelle Nguyen, MD prescribe under Medicare Part D?
In 2024, Isabelle Nguyen, MD had 27 Medicare Part D claims for 17 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.