Keith Chunyen Hsu, MD
Hospitalist Physician · Mission Viejo, CA
Keith Chunyen Hsu, MD is a hospitalist physician with a practice address in Mission Viejo, California, and NPI 1891921458, issued on Jun 9, 2009. Check the license (California A110787C, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Keith Chunyen Hsu
- Credential
- MD
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- A110787C CA
Self-reported in NPPES; status is on the state search - Practice location
- 26800 Crown Valley Pkwy, Mission Viejo, CA 92691
- Phone
- (949) 364-6000
- Enumerated
- Jun 9, 2009
- Record last updated
- Oct 28, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (949) 367-0518
- Medicare enrollment
- Enrolled (PECOS I20111012000521); accepts Medicare assignment
- Medical or professional school
- Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University, 2008
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 26800 Crown Valley Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Keith Chunyen Hsu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A110787CCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
20% fewer Medicare Part D claims than the average hospitalist physician in 2024
418 Medicare Part D claims for 157 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 21 claims were for opioids.
Most prescribed
- Pantoprazole Sodium28 claims
- Atorvastatin Calcium18 claims
- Clopidogrel18 claims
- Amoxicillin-Clavulanate Potass16 claims
- Methylprednisolone16 claims
- Tamsulosin Hcl13 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.
Industry payments in 2024: $25.61
1 payment: food and beverage; the largest payer was Abbvie Inc. The 7,324 providers of this specialty with any payment received $494.84 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Providence Medical FoundationFullerton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Keith Chunyen Hsu among 3,099 hospitalist physician records in California
Keith Chunyen Hsu, 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
- Graduated2008 · median 2010 among the 2,505 with a school on file
- Record last updated2020 · 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 Mission Viejo → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Ajit Ahluwalia, MD, MHAMission Viejo, CA 926911548465156
- Reza Dehkordi, MDMission Viejo, CA 926911679540116
- Kevin Le, MDMission Viejo, CA 926911356594675
- Michael Monge, M.D.Mission Viejo, CA 926911457513178
- Sina Neshatian, M.D.Mission Viejo, CA 926911750510913
- Loan Nguyen, MDMission Viejo, CA 926911346477858
- Shohreh Sameni, M.D.Mission Viejo, CA 926911386999050
- Muhammad Shakeel, M.D.Mission Viejo, CA 926911851581003
Common questions
What is Keith Chunyen Hsu, MD's NPI number?
Keith Chunyen Hsu, MD's National Provider Identifier (NPI) is 1891921458, issued on Jun 9, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Keith Chunyen Hsu, MD located?
The NPPES record lists a practice address at 26800 Crown Valley Pkwy, Mission Viejo, CA, 92691. Phone: (949) 364-6000. Providers update this record themselves, so call before visiting.
How can I verify Keith Chunyen Hsu, MD's license?
NPPES lists California license number A110787C, 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 Keith Chunyen Hsu, MD prescribe under Medicare Part D?
In 2024, Keith Chunyen Hsu, MD had 418 Medicare Part D claims for 157 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.