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

Dr. Frederick John Oeltjen, PHD

Individual provider Clinical Psychologist · NPI 1942348487

Dr. Frederick John Oeltjen, PHD is a Clinical Psychologist in Rockville, Maryland. Licensed in District of Columbia and Maryland. Registered with an NPI since 2007.

Licensed in
DC, MD
In the registry since
2007
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.

See every abbreviation used in this directory →

Practice location Address checks out

20 Courthouse Sq Ste 202
Rockville, MD 20850-2336
Phone: (301) 424-6955
Fax: (301) 424-4836
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 01189 (MD)
Clinical Psychologist Taxonomy 103TC0700X · Licence PSY964 (DC)

Record details

NPI number1942348487
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedFebruary 4, 2007
Last updated in NPPESJuly 8, 2007

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