Yu-Nan Hsu, D.O
Hospitalist Physician · Fountain Valley, CA
Yu-Nan Hsu, D.O is a hospitalist physician with a practice address in Fountain Valley, California, and NPI 1922382407, issued on Oct 3, 2011. Check the license (California 20A11894, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Yu-Nan Hsu
- Credential
- D.O
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License numbers
- 20A11894 CA
A11894 CA
Self-reported in NPPES; status is on the state search - Practice location
- 11037 Warner Ave, Fountain Valley, CA 92708
- Phone
- (800) 641-4651
- Enumerated
- Oct 3, 2011
- Record last updated
- Dec 28, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (714) 751-1005
- Medicaid ID
- 20A11894 CA
- Medicare enrollment
- Enrolled (PECOS I20140428000072); accepts Medicare assignment
- Medical or professional school
- Lake Erie College Of Osteopathic Medicine, Erie, 2010
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 11037 Warner Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Bernadette Ah-Hing, O.T.Occupational Therapist1679900906
- Nicholas Aiello, MSW, LSWSocial Worker1831504372
- Riley Bell, RBTOther Technician1518400449
- Danielle Bustamante, BCBABehavior Analyst1215342977
- Alicia Carroll, SLPSpeech-Language Pathologist1104207679
- Kris Chang, BTOther Technician1144779364
Verify Yu-Nan Hsu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A11894Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5.5 times the Medicare Part D claims of the average hospitalist physician in 2024
2,842 Medicare Part D claims for 259 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims. 92 claims were for opioids.
Most prescribed
- Atorvastatin Calcium171 claims
- Eliquis96 claims
- Amlodipine Besylate94 claims
- Metoprolol Tartrate84 claims
- Metformin Hcl83 claims
- Pantoprazole Sodium80 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.
Yu-Nan Hsu among 3,099 hospitalist physician records in California
Yu-Nan Hsu, D.O 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 2011, is newer than 47% of them.
- NPI issued2011 · 47% of these records are older, 49% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 81% of these records are
- Graduated2010 · median 2010 among the 2,505 with a school on file
- Record last updated2016 · 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 Fountain Valley → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- David Chan, D.O.Fountain Valley, CA 927081497068688
- Sara Ghazi, DOFountain Valley, CA 927081861816886
- Iris Gluzman, MDFountain Valley, CA 927081447323613
- Tony Khan, DOFountain Valley, CA 927081255625786
- Billy Le, D.O.Fountain Valley, CA 927081255656963
- Sapna Mehta, DOFountain Valley, CA 927081477847382
- Robert Neilan, M.D.Fountain Valley, CA 927081689763724
- Vina Nguyen, M. D.Fountain Valley, CA 927081013250497
Common questions
What is Yu-Nan Hsu, D.O's NPI number?
Yu-Nan Hsu, D.O's National Provider Identifier (NPI) is 1922382407, issued on Oct 3, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Yu-Nan Hsu, D.O located?
The NPPES record lists a practice address at 11037 Warner Ave, Fountain Valley, CA, 92708. Phone: (800) 641-4651. Providers update this record themselves, so call before visiting.
How can I verify Yu-Nan Hsu, D.O's license?
NPPES lists California license number 20A11894, 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 Yu-Nan Hsu, D.O prescribe under Medicare Part D?
In 2024, Yu-Nan Hsu, D.O had 2,842 Medicare Part D claims for 259 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.