Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Mark Joseph Sergi, PHD

Individual provider Clinical Psychologist · NPI 1750483467

Dr. Mark Joseph Sergi, PHD is a Clinical Psychologist in Northridge, California. Qualified in 1998, 28 years ago. Practices as a sole proprietor, works from 2 locations and offers telehealth. Licensed in California.

Years since qualifying
28
Licensed in
CA
In the registry since
2006
Specialties on file
2
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

9535 Reseda Blvd Ste 112
Northridge, CA 91324-6022
Phone: (818) 239-2654
Fax: (818) 450-0636
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 11301 Wilshire Blvd # 210a, Los Angeles, CA 90073-1003 — (818) 239-2654

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 16519 (CA)
Clinical Psychologist Taxonomy 103TC0700X · Licence PSY16519 (CA)

Record details

NPI number1750483467
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedSeptember 2, 2006
Last updated in NPPESMay 30, 2020
Certification dateMay 30, 2020

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 1998 (28 years in practice)
Accepts Medicare assignment Not indicated
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients27
Services billed 626 a service is one billed item, such as a visit, a test or a procedure
Average patient age69

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Other providers in Northridge