William Ng, MD
Internal Medicine Physician · San Gabriel, CA
William Ng, MD is an internal medicine physician with a practice address in San Gabriel, California, and NPI 1518298041, issued on Jan 22, 2010. Check the license (California A110227, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Ng
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A110227 CA
Self-reported in NPPES; status is on the state search - Practice location
- 506 W Valley Blvd, San Gabriel, CA 91776
- Phone
- (408) 469-3856
- Enumerated
- Jan 22, 2010
- Record last updated
- Dec 15, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20100722000734); 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 506 W Valley Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Steven ChanCardiovascular Disease Physician1790218824
- Derrick ChiNurse Practitioner1750248233
- Shirley Chiang, NPFamily Nurse Practitioner1003173410
- An Elowe, PA-CPhysician Assistant1548443310
- Yih Kok, M.D.Cardiovascular Disease Physician1518928829
- Stanley Lau, M.D.Cardiovascular Disease Physician1548222813
Verify William Ng in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A110227Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
45% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,759 Medicare Part D claims for 409 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Metoprolol Succinate247 claims
- Lisinopril118 claims
- Losartan Potassium107 claims
- Atorvastatin Calcium103 claims
- Isosorbide Mononitrate Er94 claims
- Jardiance85 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 IncModesto, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Ng among 17,696 internal medicine physician records in California
William Ng, 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 2010, is newer than 63% of them.
- NPI issued2010 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1986 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
24 internal medicine physician records list a practice address in San Gabriel
They are 24 of the 762 NPPES records with a practice address in San Gabriel, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Gabriel → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Kenneth Chan, M.D.San Gabriel, CA 917761861422370
- Michelle Chan, M.D.San Gabriel, CA 917761043326283
- Araceli Chanbonpin, M.D.San Gabriel, CA 917761962572909
- Jennifer Chen, MDSan Gabriel, CA 917761548335516
- Le-Young Lee, MDSan Gabriel, CA 917761861417586
- Su Lee, M.D.San Gabriel, CA 917761871510370
- Charles Lin, MDSan Gabriel, CA 917761982719225
- Garry Pratt, MDSan Gabriel, CA 917761679592281
Common questions
What is William Ng, MD's NPI number?
William Ng, MD's National Provider Identifier (NPI) is 1518298041, issued on Jan 22, 2010. An NPI identifies a provider in billing; it is not a license.
Where is William Ng, MD located?
The NPPES record lists a practice address at 506 W Valley Blvd, San Gabriel, CA, 91776. Phone: (408) 469-3856. Providers update this record themselves, so call before visiting.
How can I verify William Ng, MD's license?
NPPES lists California license number A110227, 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 William Ng, MD prescribe under Medicare Part D?
In 2024, William Ng, MD had 1,759 Medicare Part D claims for 409 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.