David Glenn Markwell, PHD, LPC, NCC

Primary specialty

Professional CounselorTaxonomy code 101YP2500X

License

3565 Issued in GA

Practice address

2440 Sandy Plains Road
Building 21 Suite 200
Marietta, GA 30066-7233

Phone

(770) 993-9700

Fax

(770) 993-9800

NPI assigned

Jul 11, 2006

Sex

Male

Sole proprietor

Yes

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Other identifiers 6

Medicare fee-for-service enrollment

Enrolled in GA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: No
• Power mobility devices: No
• Hospice: No

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Philosophy

State licenses

Practice roles

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Ridgeline Counseling LLC

  • Community/Behavioral Health Agency
  • Marietta, GA
  • NPI 1508058389
  Medicare reassignment NPD Authorized official

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1152576000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1765497600000",
    "number": "1336173541",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2440 SANDY PLAINS ROAD",
            "address_2": "BUILDING 21 SUITE 200",
            "city": "MARIETTA",
            "state": "GA",
            "postal_code": "300667233",
            "telephone_number": "770-993-9700",
            "fax_number": "770-993-9800"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2440 SANDY PLAINS ROAD",
            "address_2": "BUILDING 21 SUITE 200",
            "city": "MARIETTA",
            "state": "GA",
            "postal_code": "300667233",
            "telephone_number": "770-993-9700",
            "fax_number": "770-993-9800"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MARKWELL",
        "first_name": "DAVID",
        "middle_name": "GLENN",
        "name_prefix": "Dr.",
        "credential": "PHD, LPC, NCC",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2006-07-11",
        "last_updated": "2025-12-12",
        "certification_date": "2025-12-12",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "101YP2500X",
            "taxonomy_group": "",
            "desc": "Counselor, Professional",
            "state": "GA",
            "license": "3565",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BLUE CROSS BLUE SHIELD",
            "identifier": "201137",
            "state": "GA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "TRICARE",
            "identifier": "2013",
            "state": null
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "376933122C",
            "state": "GA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "UNITED BEHAVORIAL",
            "identifier": "285087495",
            "state": null
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MAGELLAN",
            "identifier": "477177000",
            "state": "GA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "AETNA",
            "identifier": "7007423",
            "state": "GA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• John Francis Markham III, DC
• Svetlana Markova, PHD
• Amanda L Marks, LAPC
• Timia Marks
• Victoria D. Marks, FNP-C
• Kimberly Brooke Markwell
• Holly Markwordt, DDS
• Pamala Smith Marquess, PHARMD
• Carla Michelle Marrero-Sanchez, DC,
• Amy Marshall, MS, NCC, LPC

• Professional Counselor in Marietta, GA
• Providers in Marietta, GA by specialty
• Professional Counselor in Georgia

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 12, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.