Vivian Ng, M.D.
Gastroenterology Physician · Redwood City, CA
Vivian Ng, M.D. is a gastroenterology physician with a practice address in Redwood City, California, and NPI 1700026416, issued on Feb 20, 2009. Check the license (California A111047, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Vivian Ng
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A111047 CA
Self-reported in NPPES; status is on the state search - Practice location
- 905 Maple St., Redwood City, CA 94063
- Phone
- (650) 299-2537
- Enumerated
- Feb 20, 2009
- Record last updated
- Dec 20, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (650) 299-4172
- Medicare enrollment
- Enrolled (PECOS I20110623000016); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 2008
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Verify Vivian Ng in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A111047Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4% fewer Medicare Part D claims than the average gastroenterology physician in 2024
776 Medicare Part D claims for 405 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Gavilyte-C265 claims
- Pantoprazole Sodium58 claims
- Omeprazole55 claims
- Sucralfate52 claims
- Famotidine37 claims
- Mesalamine36 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
- Permanente Medical Group IncRedwood City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Vivian Ng among 2,140 gastroenterology physician records in California
Vivian Ng, M.D. is one of 2,140 gastroenterology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 69% of them.
- NPI issued2009 · 69% of these records are older, 28% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2008 · median 2002 among the 1,538 with a school on file
- Record last updated2021 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Redwood City → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Ming-Shing Chiu, MDRedwood City, CA 940631154409712
- Francis Chui, MDRedwood City, CA 940631033297684
- Henry Chun, MDRedwood City, CA 940631952489502
- Christina Dimopoulos-Verma, MDRedwood City, CA 940631053976738
- Yejoo JeonRedwood City, CA 940631851851679
- Madhuri BadrinathRedwood City, CA 940621972030146
- Susan Cummings, MDRedwood City, CA 940621619946514
- Betty Ho, M.D.Redwood City, CA 940621134168750
Common questions
What is Vivian Ng, M.D.'s NPI number?
Vivian Ng, M.D.'s National Provider Identifier (NPI) is 1700026416, issued on Feb 20, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Vivian Ng, M.D. located?
The NPPES record lists a practice address at 905 Maple St., Redwood City, CA, 94063. Phone: (650) 299-2537. Providers update this record themselves, so call before visiting.
How can I verify Vivian Ng, M.D.'s license?
NPPES lists California license number A111047, 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 Vivian Ng, M.D. prescribe under Medicare Part D?
In 2024, Vivian Ng, M.D. had 776 Medicare Part D claims for 405 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.