David Markwell, PHD, LPC, NCC
NPI 1336173541 · Professional Counselor · Marietta, GA
Enrolled with Medicare as Practitioner - Mental Health Counselor · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Markwell, PHD, LPC, NCC is a Professional Counselor provider in Marietta, GA (NPI 1336173541).
Provider details
- NPI number
- 1336173541
- Entity type
- Individual
- Primary specialty
- Professional CounselorBehavioral Health & Social Service Providers
- Credential
- PHD, LPC, NCC
- Sex
- Male
- Sole proprietor
- Yes
- License
- 3565 (GA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-11
- Last updated
- 2025-12-12
- Certified
- 2025-12-12
Frequently asked questions
- What is David Markwell's NPI number?
- David Markwell's National Provider Identifier (NPI) is 1336173541, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Markwell's specialty?
- David Markwell is listed in the NPPES registry with a primary specialty of Professional Counselor (Behavioral Health & Social Service Providers).
- Where is David Markwell located?
- David Markwell's practice location on file with NPPES is 2440 Sandy Plains Road, Marietta, GA 30066-7233.
- What is David Markwell's phone number?
- The practice phone number listed in the NPPES registry for David Markwell is (770) 993-9700.
- Does David Markwell accept Medicare?
- David Markwell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Markwell's NPI active?
- Yes — David Markwell's NPI (1336173541) is active in the NPPES registry as of the last update on 2025-12-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.