Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Dr. David E. Duffy, PHD

Individual provider Clinical Psychologist · NPI 1326244955

Dr. David E. Duffy, PHD is a Clinical Psychologist in LA Mesa, California. Qualified in 1999, 27 years ago. Practices with Memory Check Psychological Services, a Professional Corporation, a 80-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
27
Licensed in
CA
In the registry since
2007
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

8787 Center Dr
LA Mesa, CA 91942-3034 Not confirmed with CMS for 19 years — call before visiting
Phone: (800) 257-8715
Fax: (800) 819-1655
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence PSY19177 (CA)

Record details

NPI number1326244955
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedJune 21, 2007
Last updated in NPPESJuly 8, 2007

Medicare enrollment

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

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 1999 (27 years in practice)
Group practice Memory Check Psychological Services, A Professional Corporation — 80 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients174
Services billed 756 a service is one billed item, such as a visit, a test or a procedure
Average patient age78

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.

Colleagues at Memory Check Psychological Services, a Professional Corporation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 80 clinicians in the practice; 12 are shown here.

Other providers in LA Mesa