Yichen Ethel Wu, MD
Hospitalist Physician · San Francisco, CA
Yichen Ethel Wu, MD is a hospitalist physician with a practice address in San Francisco, California, and NPI 1871722611, issued on Jul 14, 2009. Check the license (California A121923, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Yichen Ethel Wu
- Credential
- MD
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- A121923 CA
Self-reported in NPPES; status is on the state search - Practice location
- 521 Parnassus Ave, San Francisco, CA 94143
- Phone
- (415) 502-1413
- Enumerated
- Jul 14, 2009
- Record last updated
- Feb 25, 2022
- Fax
- (415) 476-4818
- Medicare enrollment
- Enrolled (PECOS I20120815000381); accepts Medicare assignment
- Medical or professional school
- Boston University School Of Medicine, 2009
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 521 Parnassus Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Daniela Arango Isaza, MDHospitalist Physician1427722990
Verify Yichen Ethel Wu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A121923Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% fewer Medicare Part D claims than the average hospitalist physician in 2024
134 Medicare Part D claims for 43 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
Most prescribed
- Micafungin18 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
- Regents OF The University OF CaliforniaSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Yichen Ethel Wu among 3,099 hospitalist physician records in California
Yichen Ethel Wu, MD is one of 3,099 hospitalist physician records with a practice address in California. 90% 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 39% of them.
- NPI issued2009 · 39% of these records are older, 56% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 81% of these records are
- Graduated2009 · median 2010 among the 2,505 with a school on file
- Record last updated2022 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in California
There are 3,099 hospitalist physician records in California.
All 3,099 in California → Every provider in San Francisco → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Seth Blumberg, MD PHDSan Francisco, CA 941431255595443
- Robertino Garcia Cortes, MDSan Francisco, CA 941431770872590
- Robin Goldman, MD, MPHSan Francisco, CA 941431033439906
- Win Han, MDSan Francisco, CA 941431619110384
- Ari HoffmanSan Francisco, CA 941431346566221
- Alison Kuchta, M.D.San Francisco, CA 941431063704963
- Andrew Lai, M.D.San Francisco, CA 941431861666281
- Khoa Lam, M.D.San Francisco, CA 941431801114095
Common questions
What is Yichen Ethel Wu, MD's NPI number?
Yichen Ethel Wu, MD's National Provider Identifier (NPI) is 1871722611, issued on Jul 14, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Yichen Ethel Wu, MD located?
The NPPES record lists a practice address at 521 Parnassus Ave, San Francisco, CA, 94143. Phone: (415) 502-1413. Providers update this record themselves, so call before visiting.
How can I verify Yichen Ethel Wu, MD's license?
NPPES lists California license number A121923, 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 Yichen Ethel Wu, MD prescribe under Medicare Part D?
In 2024, Yichen Ethel Wu, MD had 134 Medicare Part D claims for 43 beneficiaries; the average among hospitalist physician prescribers was 521. 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.