Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. John William Dettwyler, PHD

Individual provider Psychologist · NPI 1982776324

Dr. John William Dettwyler, PHD is a Clinical Psychologist in Wilmington, Delaware. Graduated from Temple University School of Medicine in 1987, 39 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in Delaware.

Years since qualifying
39
Trained at
Temple University School of Medicine
Licensed in
DE
In the registry since
2006
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

5301 Limestone Rd Ste 103
Wilmington, DE 19808-1250
Phone: (302) 234-8982
Fax: (302) 234-8984
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence B10000210 (DE)

Record details

NPI number1982776324
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedNovember 14, 2006
Last updated in NPPESJuly 8, 2007

Medicare enrollment

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

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolTEMPLE UNIVERSITY SCHOOL OF MEDICINE
Graduated 1987 (39 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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