Independent US Healthcare Provider Directory & Public Medical Database
Active NPI 1336173541 Individual Practitioner Male Practitioner

Dr. David Glenn Markwell , PhD, LPC, NCC

Counselor - Professional • Marietta, GA

Professional Overview & Biography Verified Profile Summary

Dr. David Markwell, PhD, LPC, NCC is a registered healthcare professional specializing in Counselor - Professional in Marietta, GA. Practice services are available at 2440 SANDY PLAINS ROAD under active NPI credentials.

Practice Location & Contact Primary Location

Practice Address

2440 Sandy Plains Road
Building 21 Suite 200

Marietta, GA 300667233

Telephone 7709939700
Fax 7709939800
Associated Practice Facility / Clinic
🏢 Ridgeline Counseling Llc Facility NPI 1508058389

Specialty Benchmarks & Practice Insights

Comparative analytics for Counselor - Professional in Marietta, GA

Active Practitioner
Practitioner Clinical Experience
Active
City Avg: 16.3 Yrs
State Avg: 15.6 Yrs
Regional Practice Density
345 Specialists

Practicing in Marietta, GA (6655 Statewide)

Telehealth Adoption Rate
2.6% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount
67.4% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Medical Specialties & State Licenses

CMS Verified: 2025-12-12
Counselor - Professional Primary Specialty

NUCC Taxonomy Code: 101YP2500X

State License GA 3565

Definition to come...

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID
376933122C (GA)
Commercial Insurance / Payer ID Blue Cross Blue Shield
201137 (GA)
Commercial Insurance / Payer ID Tricare
2013
Commercial Insurance / Payer ID United Behavorial
285087495
Commercial Insurance / Payer ID Magellan
477177000 (GA)
Commercial Insurance / Payer ID Aetna
7007423 (GA)

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

8 Associated Practitioners
Bonita Klopach , LCSW

Social Worker - Clinical

NPI 1003303231

Licensed Clinical Social Worker

Maria Garcia

Counselor - Mental Health

NPI 1003320490
NPI 1114365400
Kimberly Markwell

Counselor - Mental Health

NPI 1356886410
Debbie Emerson , LPC

Counselor - Professional

NPI 1568603165

Licensed Professional Counselor

Crista Scott-Barbour

Counselor - Professional

NPI 1578044525

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

10 Historical Events
📍
Updated Practice Location December 12, 2025

Registered at 2440 SANDY PLAINS ROAD, BUILDING 21 SUITE 200, MARIETTA, GA 300667233 (Tel: 7709939700)

📍
Updated Business Mailing Address December 12, 2025

Registered at 2440 SANDY PLAINS ROAD, BUILDING 21 SUITE 200, MARIETTA, GA 300667233 (Tel: 7709939700)

📍
Updated Practice Location February 23, 2022

Registered at 4343 SHALLOWFORD RD STE 220, MARIETTA, GA 300625077 (Tel: 7709939700)

📍
Updated Business Mailing Address February 23, 2022

Registered at 4343 SHALLOWFORD RD STE 220, MARIETTA, GA 300625077 (Tel: 7709939700)

NPI Profile Active May 13, 2011

NPI status registered as active in NPPES database

📍
Updated Practice Location May 13, 2011

Registered at 4343 SHALLOWFORD RD, SUITE C 2, MARIETTA, GA 300625023 (Tel: 7709939700)

📍
Updated Business Mailing Address May 13, 2011

Registered at 2451 MITCHELL RD NE, MARIETTA, GA 300627905 (Tel: 7707136064)

👤
Provider Name / Credentials Updated May 13, 2011

Recorded as DAVID MARKWELL, PHD, LPC, NCC

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) May 13, 2011

Counselor (License #3565 in GA)

🟢
Initial NPI Registration & Enumeration July 11, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1336173541
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: July 11, 2006
Last Update: December 12, 2025
Sole Proprietor: Yes

Mailing Address

2440 Sandy Plains Road, Building 21 Suite 200

Marietta, GA 300667233

Phone: 7709939700

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).
⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.