DR. JOHN STEVEN LAMMERT MD
NPI 1699727909
Internal Medicine in Woodstock, GA
About Dr. John Steven Lammert Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN STEVEN LAMMERT MD (NPI 1699727909) is an individual internal medicine provider in Woodstock, Georgia, licensed in Georgia (33619) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS, is affiliated with Northside Hospital Cherokee, and is a graduate of Medical College Of Georgia School Of Medicine (1989).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. John Steven Lammert Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show John Lammert reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Woodstock, GA 30189
- Reassigned Medicare billing, Georgia enrollment
- 3,885 clinicians in this Medicare group
Alpharetta, GA 30005
- Reassigned Medicare billing, Georgia enrollment
- 24 clinicians in this Medicare group
Hiram, GA 30141
- Reassigned Medicare billing, Georgia enrollment
- 551 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 9
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Northside Hospital Cherokee
Acute Care Hospitals · Canton, GAWellstar Kennestone Regional Medical Center
Acute Care Hospitals · Marietta, GAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 30189 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is John Lammert's NPI number?
The NPI number for John Lammert is 1699727909. It was assigned to this individual provider in the NPPES registry on May 16, 2006.
Where is John Lammert located?
John Lammert practices at 900 Towne Lake Pkwy Ste 210, Woodstock, GA 30189. The listed phone number is (770) 592-2300.
What is John Lammert's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is John Lammert enrolled in Medicare?
Yes. John Lammert is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for John Lammert's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Lammert reassigns Medicare benefits to 3 organizations: Wellstar Medical Group, LLC (Woodstock, GA), Perimeter Professional Services, LLC (Alpharetta, GA) and Peachtree Immediate Care Fp, LLC (Hiram, GA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Lammert's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Lammert accept?
Health plans from Ambetter Health, Ambetter from Absolute Total Care, Ambetter of Alabama, Ambetter of North Carolina and Ambetter of Tennessee and 1 other insurer list John Lammert as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is John Lammert affiliated with any hospitals?
According to CMS data, John Lammert is affiliated with Northside Hospital Cherokee and Wellstar Kennestone Regional Medical Center.
When was this NPI record last updated?
The NPPES record for John Lammert was last updated on October 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. John Steven Lammert, MD · NPI 1699727909
Internal Medicine physician in Woodstock, Georgia. Individual provider, active in the CMS NPPES registry since May 16, 2006.
## Identity
- **NPI:** 1699727909 (Entity type: Individual)
- **Enumerated:** May 16, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 33619 (Georgia)
- **Sole proprietor:** No
## Practice location
- **Address:** 900 TOWNE LAKE PKWY STE 210, Woodstock, GA 30189-1603
- **Phone:** (770) 592-2300 · **Fax:** (770) 592-2040
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Wellstar Medical Group, LLC (NPI 1154627115, Woodstock, GA); Perimeter Professional Services, LLC (NPI 1235543620, Alpharetta, GA); Peachtree Immediate Care Fp, LLC (NPI 1437194156, Hiram, GA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Medical College Of Georgia School Of Medicine, class of 1989
## Record status
- **NPPES last updated:** October 17, 2025
---
Source: [NPI Profile](https://npiprofile.com/npi/1699727909) · Data from the CMS NPPES public registry.