David T. Hsieh, M.D.
Family Medicine Physician · Diamond Bar, CA
David T. Hsieh, M.D. is a family medicine physician with a practice address in Diamond Bar, California, and NPI 1891919874, issued on Apr 12, 2007. Check the license (California A40716, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- David T. Hsieh
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A40716 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1142 S Diamond Bar Blvd, Diamond Bar, CA 91765
- Phone
- (909) 720-8122
- Enumerated
- Apr 12, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (909) 612-1034
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1142 S Diamond Bar Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nayan Shah, MDObstetrics & Gynecology Physician1174631402
Verify David T. Hsieh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A40716Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average family medicine physician in 2024
73 Medicare Part D claims for 30 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
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.
David T. Hsieh among 17,133 family medicine physician records in California
David T. Hsieh, M.D. 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 2007, is newer than 41% of them.
- NPI issued2007 · 41% of these records are older, 47% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2007 · 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).
25 family medicine physician records list a practice address in Diamond Bar
They are 25 of the 598 NPPES records with a practice address in Diamond Bar, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Diamond Bar → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- William FenertyDiamond Bar, CA 917651184625915
- John Fonmin, MDDiamond Bar, CA 917651629147319
- Lubna Isho, DODiamond Bar, CA 917651851350797
- Brian Koffman, MDDiamond Bar, CA 917651326049164
- Yann Ping Pan, MDDiamond Bar, CA 917651114250925
- David Rhodes, MDDiamond Bar, CA 917651518968353
- Yvonne Rodriguez Lawson, MDDiamond Bar, CA 917651912967233
- Hitendra Shah, M.D.Diamond Bar, CA 917651376614818
Common questions
What is David T. Hsieh, M.D.'s NPI number?
David T. Hsieh, M.D.'s National Provider Identifier (NPI) is 1891919874, issued on Apr 12, 2007. An NPI identifies a provider in billing; it is not a license.
Where is David T. Hsieh, M.D. located?
The NPPES record lists a practice address at 1142 S Diamond Bar Blvd, Diamond Bar, CA, 91765. Phone: (909) 720-8122. Providers update this record themselves, so call before visiting.
How can I verify David T. Hsieh, M.D.'s license?
NPPES lists California license number A40716, 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 David T. Hsieh, M.D. prescribe under Medicare Part D?
In 2024, David T. Hsieh, M.D. had 73 Medicare Part D claims for 30 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.