William Chun-Yin Hui, MD
Family Medicine Physician · Stanford, CA
William Chun-Yin Hui, MD is a family medicine physician with a practice address in Stanford, California, and NPI 1457857831, issued on Apr 4, 2018. Check the license (California A164255, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Chun-Yin Hui
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- A164255 CA
MD473425 PA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr, Stanford, CA 94305
- Phone
- (650) 723-4000
- Enumerated
- Apr 4, 2018
- Record last updated
- Apr 26, 2024
- Medicare enrollment
- Enrolled (PECOS I20220503001773); accepts Medicare assignment
- Medical or professional school
- Drexel University College Of Medicine, 2018
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 300 Pasteur Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Chun-Yin Hui in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A164255Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
62% fewer Medicare Part D claims than the average family medicine physician in 2024
1,342 Medicare Part D claims for 431 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 30 claims were for opioids.
Most prescribed
- Atorvastatin Calcium99 claims
- Levothyroxine Sodium57 claims
- Amlodipine Besylate48 claims
- Lisinopril43 claims
- Tamsulosin Hcl43 claims
- Gabapentin38 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.
One hospital affiliation
- Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
William Chun-Yin Hui among 17,133 family medicine physician records in California
William Chun-Yin Hui, MD is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 82% of them.
- NPI issued2018 · 82% of these records are older, 15% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2018 · median 2005 among the 10,652 with a school on file
- Record last updated2024 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
64 family medicine physician records list a practice address in Stanford
They are 64 of the 5,606 NPPES records with a practice address in Stanford, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Stanford → Family Medicine Physician nationwide →
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Common questions
What is William Chun-Yin Hui, MD's NPI number?
William Chun-Yin Hui, MD's National Provider Identifier (NPI) is 1457857831, issued on Apr 4, 2018. An NPI identifies a provider in billing; it is not a license.
Where is William Chun-Yin Hui, MD located?
The NPPES record lists a practice address at 300 Pasteur Dr, Stanford, CA, 94305. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.
How can I verify William Chun-Yin Hui, MD's license?
NPPES lists California license number A164255, 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 Chun-Yin Hui, MD prescribe under Medicare Part D?
In 2024, William Chun-Yin Hui, MD had 1,342 Medicare Part D claims for 431 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.