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

Individual provider Clinical Psychologist · NPI 1215940648

Dr. Holly Drewer Erwin, PHD is a Clinical Psychologist in Manassas, Virginia. Practices as a sole proprietor. Licensed in Virginia.

Licensed in
VA
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

9625 Surveyor Ct Ste 200
Manassas, VA 20110-4408
Phone: (703) 330-9933
Fax: (703) 368-8454
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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 0810003271 (VA)

Record details

NPI number1215940648
Entity typeIndividual (Type 1)
GenderFemale
Credentials PHD
Sole proprietorYes
NPI enumeratedAugust 15, 2006
Last updated in NPPESJuly 9, 2007
Mailing address9625 Surveyor Ct Ste 200, Manassas, VA 20110-4408

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