NPI age
19 years
Enumerated 2006-07-11
● Active
Type 1 · Individual
DR. David Glenn Markwell, PHD, LPC, NCC
Markwell is 1 of 383 counselor providers in Marietta and 1 of 7547 in Georgia.
Primary specialty
Counselor
Licensed in
GA
1 state
Status
Active
No deactivations on record
Last NPPES update
2025-12-12
Source: monthly bulk 2026-05
Sole proprietor
Yes
Solo practice on file
How this provider compares
Across 7547 active counselor providers in Georgia.
NPI age
19 years
↑ 10 yr above median (9 yr)
State licenses
1 state
4% of peers hold multiple states
Subspecialties
0
19% of peers hold subspecialties
NPI lifetime · 2006 → 2026
2006-07Enumerated in NPPES
2006
2026
Where they practice
Practice location
2440 Sandy Plains Road, Building 21 Suite 200
Marietta, GA 300667233
Mailing address
2440 Sandy Plains Road, Building 21 Suite 200
Marietta, GA 300667233
Specialties
-
Counselor PrimaryDefinition to come...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 01 (GA) | 201137 | BLUE CROSS BLUE SHIELD |
| 01 | 2013 | TRICARE |
| 05 (GA) | 376933122C | |
| 01 | 285087495 | UNITED BEHAVORIAL |
| 01 (GA) | 477177000 | MAGELLAN |
| 01 (GA) | 7007423 | AETNA |
Practice context
Part of a multi-provider practice. 3 other active providers share this practice address in NPPES.
Recently enumerated nearby: 2 new counselor providers have been added in Marietta in the last 180 days.
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- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
- Check the state license is currently active.State licensing boards publish current status; NPPES does not.
- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.