Zachary Charles Herzfeldt, M.D.
Psychiatry Physician · Diamond Bar, CA
Zachary Charles Herzfeldt, M.D. is a psychiatry physician with a practice address in Diamond Bar, California, and NPI 1205215936, issued on May 27, 2015. Check the license (California A148801, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Zachary Charles Herzfeldt
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- A148801 CA
Self-reported in NPPES; status is on the state search - Practice location
- 21015 Pathfinder RD Ste 100, Diamond Bar, CA 91765
- Phone
- (909) 468-2300
- Enumerated
- May 27, 2015
- Record last updated
- Jul 9, 2026
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 21015 Pathfinder RD Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Zachary Charles Herzfeldt in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A148801Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 85.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Zachary Charles Herzfeldt among 8,673 psychiatry physician records in California
Zachary Charles Herzfeldt, M.D. is one of 8,673 psychiatry physician records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 74% of them.
- NPI issued2015 · 74% of these records are older, 23% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2026 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
10 psychiatry physician records list a practice address in Diamond Bar
They are 10 of the 598 NPPES records with a practice address in Diamond Bar, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Diamond Bar → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Paul Brown, M.D.Diamond Bar, CA 917651437361789
- Sateesh Gunda, M.D.Diamond Bar, CA 917651134407844
- Adel Hanna, MDDiamond Bar, CA 917651194868224
- Karen Kiefer, D.O.Diamond Bar, CA 917651578586574
- Siddhartha Kumar, MDDiamond Bar, CA 917651265464374
- Margaret Lin, MDDiamond Bar, CA 917651275600132
- Vimal Satodiya, M.D.Diamond Bar, CA 917651174879134
- Kevin Wethey, MDDiamond Bar, CA 917651306378559
Common questions
What is Zachary Charles Herzfeldt, M.D.'s NPI number?
Zachary Charles Herzfeldt, M.D.'s National Provider Identifier (NPI) is 1205215936, issued on May 27, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Zachary Charles Herzfeldt, M.D. located?
The NPPES record lists a practice address at 21015 Pathfinder RD Ste 100, Diamond Bar, CA, 91765. Phone: (909) 468-2300. Providers update this record themselves, so call before visiting.
How can I verify Zachary Charles Herzfeldt, M.D.'s license?
NPPES lists California license number A148801, 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.
What is Zachary Charles Herzfeldt, M.D.'s MIPS final score?
The 2023 MIPS final score is 85.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.