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

Dr. Alan L. Marcus Sr., PHD

Individual provider Psychologist · NPI 1962526384

Dr. Alan L. Marcus Sr., PHD is a Psychologist in Rockville, Maryland. Practices as a sole proprietor. Licensed in District of Columbia and Maryland.

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

6218 Montrose Rd
Rockville, MD 20852-4119
Phone: (301) 775-2636
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence 02965 (MD)
Psychologist Taxonomy 103T00000X · Licence PSY1685 (DC)

Record details

NPI number1962526384
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedMarch 19, 2007
Last updated in NPPESJuly 8, 2007

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