Vivien An Nguyen, M.D.
Pediatric Gastroenterology Physician · Walnut Creek, CA
Vivien An Nguyen, M.D. is a pediatric gastroenterology physician with a practice address in Walnut Creek, California, and NPI 1154586659, issued on Jul 23, 2008. Check the license (California A101918, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Vivien An Nguyen
- Credential
- M.D.
- Primary taxonomy
- Pediatric Gastroenterology Physician 2080P0206X
- License number
- A101918 CA
Self-reported in NPPES; status is on the state search - Practice location
- 106 LA Casa Via Ste 100, Walnut Creek, CA 94598
- Phone
- (650) 497-8000
- Enumerated
- Jul 23, 2008
- Record last updated
- Dec 19, 2017 (not updated in 9 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest pediatric gastroenterology physician records → All 264 in California → Look up another NPI →
Also registered at 106 LA Casa Via Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lisa Arcilla, MDPediatric Cardiology Physician1649430364
- Erica Bennett, MDOtolaryngology Physician1164438875
- Pamela Bohrer, MDOtolaryngology Physician1497839476
- Danielle Brown, NPNurse Practitioner1851834410
- Maryann ChristofasPediatric Nutrition Registered Dietitian1184172736
- David Garcia, MDPediatrics Physician1942756143
Verify Vivien An Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A101918Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
50% more Medicare Part D claims than the average pediatric gastroenterology physician in 2024
63 Medicare Part D claims, against an average of 42 among the 289 providers of this specialty who prescribed in Part D.
Most prescribed
- Heparin Sodium12 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.
Vivien An Nguyen among 264 pediatric gastroenterology physician records in California
Vivien An Nguyen, M.D. is one of 264 pediatric gastroenterology physician records with a practice address in California. 62% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 48% of them.
- NPI issued2008 · 48% of these records are older, 44% newer
- In a Medicare fileYes · 62% of these records are
- In the CMS Doctors and Clinicians fileNo · 30% of these records are
- Record last updated2017 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2080P0206X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pediatric Gastroenterology Physician providers in California
There are 264 pediatric gastroenterology physician records in California.
All 264 in California → Every provider in Walnut Creek → Pediatric Gastroenterology Physician nationwide →
The 8 pediatric gastroenterology physician records with the nearest ZIP codes
- Susan Jeiven, M.D.Walnut Creek, CA 945981386606804
- Sabina Ali, MDOakland, CA 946091336351717
- Elizabeth Gleghorn, M.D.Oakland, CA 946091093809659
- Paul Harmatz, MDOakland, CA 946091255435301
- Arathi Lakhole, M.D, M.P.HOakland, CA 946091013309145
- Prita Mohanty, MDOakland, CA 946091386966984
- Robert Rothbaum, M.D.Oakland, CA 946091326066887
- Mala Setty, M.D.Oakland, CA 946091790720308
Common questions
What is Vivien An Nguyen, M.D.'s NPI number?
Vivien An Nguyen, M.D.'s National Provider Identifier (NPI) is 1154586659, issued on Jul 23, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Vivien An Nguyen, M.D. located?
The NPPES record lists a practice address at 106 LA Casa Via Ste 100, Walnut Creek, CA, 94598. Phone: (650) 497-8000. Providers update this record themselves, so call before visiting.
How can I verify Vivien An Nguyen, M.D.'s license?
NPPES lists California license number A101918, 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 Vivien An Nguyen, M.D. prescribe under Medicare Part D?
In 2024, Vivien An Nguyen, M.D. had 63 Medicare Part D claims; the average among pediatric gastroenterology physician prescribers was 42. 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.