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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. ZACHARY CHARLES HERZFELDT M.D.
NPI 1205215936
Psychiatry & Neurology - Psychiatry in Diamond Bar, CA

Active since May 27, 2015PECOS Enrolled
85.18/100
CMS Quality Rating
21015 PATHFINDER RD STE 100, DIAMOND BAR, CA 91765(909) 468-2300 Get Directions Write a Review

NPPES record last updated: July 9, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jul 9, 2026, Nov 13, 2019, Jun 17, 2019 and 1 more (4 updates tracked since 2018).

About Dr. Zachary Charles Herzfeldt M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. ZACHARY CHARLES HERZFELDT M.D. (NPI 1205215936) is an individual psychiatry provider in Diamond Bar, California, licensed in California (A148801) and active in the NPI registry since May 2015. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1205215936
Entity TypeIndividualMale
Primary Taxonomy2084P0800X
Provider Legal NameDR. ZACHARY CHARLES HERZFELDTCredential: M.D.
Location Address21015 PATHFINDER RD STE 100Diamond Bar, CA 91765-4002
Mailing Address21015 Pathfinder Rd Ste 100Diamond Bar, CA 91765-4002
Phone(909) 468-2300
Sole ProprietorNo
Enumeration DateMay 27, 2015
Last NPPES UpdateJuly 9, 20264 updates tracked since enumeration
NPPES CertifiedJuly 9, 2026
✔ NPI 1205215936 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in CA · A148801
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
21015 PATHFINDER RD STE 100, Diamond Bar, CA 91765
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Zachary Charles Herzfeldt M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91765 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$187.60 typical visit price
range $62.96 – $187.60
Typical copayment $46.90 (range $15.74 – $46.90)
Most-billed visit code 99205
Established Patient
$77.96 typical visit price
range $20.84 – $153.61
Typical copayment $19.49 (range $5.21 – $38.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

85.18/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality71.81
Promoting Interoperability82
Improvement Activities40
Cost64.54

Other Providers at the Same Location NPPES 14

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

OLIVIA LAURA CRUZ
Physical Therapist
21015 PATHFINDER RD STE 100
DIAMOND BAR, CA 91765
Los Angeles County (909) 861-3511
JAMES MCAFEE DPT
Physical Therapist (Orthopedic)
21015 PATHFINDER RD STE 100
DIAMOND BAR, CA 91765
Los Angeles County (909) 861-3511
RILEY CHARLES DPT
Physical Therapist
21015 PATHFINDER RD STE 100
DIAMOND BAR, CA 91765
Los Angeles County (909) 861-3511
ELAINE NHAN DPT
Physical Therapist (Orthopedic)
21015 PATHFINDER RD STE 100
DIAMOND BAR, CA 91765
Los Angeles County (909) 861-3511
COLLEEN CHAU DPT
Physical Therapist (Orthopedic)
21015 PATHFINDER RD STE 100
DIAMOND BAR, CA 91765
Los Angeles County (909) 861-3511
MRS. JESSICA CRANE DPT
Physical Therapist (Orthopedic)
21015 PATHFINDER RD STE 100
DIAMOND BAR, CA 91765
Los Angeles County (909) 861-3511
DANNI BARTON
Physical Therapist
21015 PATHFINDER RD STE 100
DIAMOND BAR, CA 91765
Los Angeles County (909) 861-3511
SALEENA KHOSHNEVIS
Physical Therapist
21015 PATHFINDER RD STE 100
DIAMOND BAR, CA 91765
Los Angeles County (909) 861-3511

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Zachary Herzfeldt's NPI number?

The NPI number for Zachary Herzfeldt is 1205215936. It was assigned to this individual provider in the NPPES registry on May 27, 2015.

Where is Zachary Herzfeldt located?

Zachary Herzfeldt practices at 21015 Pathfinder Rd Ste 100, Diamond Bar, CA 91765. The listed phone number is (909) 468-2300.

What is Zachary Herzfeldt's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Zachary Herzfeldt enrolled in Medicare?

Yes. Zachary Herzfeldt is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Zachary Herzfeldt was last updated on July 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 31 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.