Andrew Chi-Wei Ng, MD
Internal Medicine Physician · Millbrae, CA
Andrew Chi-Wei Ng, MD is an internal medicine physician with a practice address in Millbrae, California, and NPI 1871716910, issued on Apr 10, 2007. Check the license (California A107327, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Andrew Chi-Wei Ng
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A107327 CA
4301088587 MI
Self-reported in NPPES; status is on the state search - Practice location
- 423 Broadway, Millbrae, CA 94030
- Phone
- (650) 732-9721
- Enumerated
- Apr 10, 2007
- Record last updated
- Jul 25, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (510) 323-4286
- Medicare enrollment
- Enrolled (PECOS I20110811000397); accepts Medicare assignment
- Medical or professional school
- Medical College Of Ohio, 2004
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 423 Broadway
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Melissa Frederick, M.D.Internal Medicine Physician1033238076
Verify Andrew Chi-Wei Ng in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A107327Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5.1 times the Medicare Part D claims of the average internal medicine physician in 2024
16,128 Medicare Part D claims for 518 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 191 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,249 claims
- Gabapentin726 claims
- Amlodipine Besylate700 claims
- Eliquis593 claims
- Furosemide513 claims
- Pantoprazole Sodium425 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 73.8 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Acn Medical Group IncMillbrae, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Andrew Chi-Wei Ng among 17,696 internal medicine physician records in California
Andrew Chi-Wei 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2004 · median 2004 among the 11,065 with a school on file
- Record last updated2014 · 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).
3 internal medicine physician records list a practice address in Millbrae
They are 3 of the 164 NPPES records with a practice address in Millbrae, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Millbrae → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Melissa Frederick, M.D.Millbrae, CA 940301033238076
- Jie LingMillbrae, CA 940301003187766
- Sylvia Friedberg, M.D.Portola Valley, CA 940281396886925
- Kathryn Hallsten, M.D.Portola Valley, CA 940281184750861
- Rebecca LongPortola Valley, CA 940281639007172
- Emma Morton-Bours, M.D.Portola Valley, CA 940281316003528
- Gerard Sarnat, M.D.Portola Valley, CA 940281750658415
- Ning Tang, M.D.Portola Valley, CA 940281790806131
Common questions
What is Andrew Chi-Wei Ng, MD's NPI number?
Andrew Chi-Wei Ng, MD's National Provider Identifier (NPI) is 1871716910, issued on Apr 10, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Andrew Chi-Wei Ng, MD located?
The NPPES record lists a practice address at 423 Broadway, Millbrae, CA, 94030. Phone: (650) 732-9721. Providers update this record themselves, so call before visiting.
How can I verify Andrew Chi-Wei Ng, MD's license?
NPPES lists California license number A107327, 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 Andrew Chi-Wei Ng, MD prescribe under Medicare Part D?
In 2024, Andrew Chi-Wei Ng, MD had 16,128 Medicare Part D claims for 518 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Andrew Chi-Wei Ng, MD's MIPS final score?
The 2023 MIPS final score is 73.8 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.