John Steven Lammert, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

33619 Issued in GA

Practice address

900 Towne Lake Pkwy Ste 210
Woodstock, GA 30189-1603

Phone

(770) 592-2300

Fax

(770) 592-2040

NPI assigned

May 16, 2006

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in GA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Internal Medicine

Education

Medical College of Georgia School of Medicine, 1989

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Perimeter Professional Services, LLCGroup PAC ID 9032337423, 21 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Northside Hospital Cherokee Hospital, Canton, GA, CCN 110008
• Wellstar Kennestone Regional Medical Center Hospital, Marietta, GA, CCN 110035
• Northside Hospital Hospital, Atlanta, GA, CCN 110161
• Wellstar Windy Hill Hospital Long-term care hospital, Marietta, GA, CCN 112007

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: johnlammert@pnfm.allscriptsdirect.net
• Direct secure messaging: john.lammert@northsidehospital.cernerdirect.com

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.

• Perimeter Professional Services, LLC

  • Family Medicine Physician
  • Alpharetta, GA
  • NPI 1235543620
  Medicare reassignment Care Compare group NPD
• Peachtree Immediate Care FP, LLC

  • Family Medicine Physician
  • Hiram, GA
  • NPI 1437194156
  Medicare reassignment NPD
• Wellstar Medical Group, LLC

  • Family Medicine Physician
  • Kennesaw, GA
  • NPI 1558664003
  Medicare reassignment NPD
• Wellstar Medical Group, LLC

  • Psychologist
  • Marietta, GA
  • NPI 1114207461
  NPD
• Wellstar Medical Group, LLC

  • Multi-Specialty Clinic/Center
  • Marietta, GA
  • NPI 1275992240
  NPD
• Perimeter North Family Practice LLC

  • Family Medicine Physician
  • Atlanta, GA
  • NPI 1295936318
  NPD (past)
• Wellstar Medical Group, LLC

  • Internal Medicine Physician
  • Marietta, GA
  • NPI 1750687463
  NPD (past)
• Wellstar Neurosurgery Services, LLC Dba Wellstar Neurosurgery

  • Neurological Surgery Physician
  • Marietta, GA
  • NPI 1760798458
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Kennestone Hospital, Inc.

  • General Acute Care Hospital
  • Marietta, GA
  • NPI 1649248626
  Care Compare affiliation
• Kennestone Hospital, Inc.

  • Long Term Care Hospital
  • Marietta, GA
  • NPI 1700853041

  Long-term care hospital

  Care Compare affiliation
• Northside Hospital, Inc.

  • General Acute Care Hospital
  • Canton, GA
  • NPI 1225050396
  Care Compare affiliation
• Northside Hospital, Inc.

  • General Acute Care Hospital
  • Atlanta, GA
  • NPI 1457396079
  Care Compare affiliation

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

{
    "created_epoch": "1147737600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1760659200000",
    "number": "1699727909",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "900 TOWNE LAKE PKWY STE 210",
            "city": "WOODSTOCK",
            "state": "GA",
            "postal_code": "301891603",
            "telephone_number": "770-592-2300",
            "fax_number": "770-592-2040"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "900 TOWNE LAKE PKWY STE 210",
            "city": "WOODSTOCK",
            "state": "GA",
            "postal_code": "301891603",
            "telephone_number": "770-592-2300",
            "fax_number": "770-592-2040"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "LAMMERT",
        "first_name": "JOHN",
        "middle_name": "STEVEN",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-05-16",
        "last_updated": "2025-10-17",
        "certification_date": "2025-10-17",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "GA",
            "license": "33619",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "john.lammert@northsidehospital.cernerdirect.com",
            "affiliation": "N",
            "endpointDescription": "Direct Messaging",
            "use": "DIRECT",
            "useDescription": "Direct",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "Direct Edge",
            "address_1": "191 Cherokee St NE",
            "city": "Marietta",
            "state": "GA",
            "country_code": "US",
            "postal_code": "300601609",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Serena Kumar, MSN, ANP-BC
• Robert Anthony Kuprionas, D.P.M.
• James Peter Kwan, DPT
• Kyle B Edwards OD PC
• Alexis Lakes
• Kathryn Clare Lang, PT, DPT
• Kathleene Lange, MA
• Erica Laplaca
• Elizabeth Larkin, LCSW
• Lasting Language Therapy Services

• Internal Medicine Physician in Woodstock, GA
• Providers in Woodstock, GA by specialty
• Internal Medicine Physician in Georgia

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 17, 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.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.