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

Dr. David Glenn Markwell, PHD, LPC, NCC

Individual provider Professional Counselor · NPI 1336173541

Dr. David Glenn Markwell, PHD, LPC, NCC is a Professional Counselor in Marietta, Georgia. Practices as a sole proprietor. Licensed in Georgia.

Licensed in
GA
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.
LPC — Licensed Professional Counselor
A licensed mental health counsellor.
NCC — National Certified Counselor
A counsellor certified by the NBCC.

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Practice location Address checks out

2440 Sandy Plains Rd Bldg 21 Ste 200
Marietta, GA 30066-7233
Phone: (770) 993-9700
Fax: (770) 993-9800
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Professional Counselor (primary) Taxonomy 101YP2500X · Licence 3565 (GA)

Record details

NPI number1336173541
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD , LPC , NCC
Sole proprietorYes
NPI enumeratedJuly 11, 2006
Last updated in NPPESDecember 12, 2025
Certification dateDecember 12, 2025

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