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GASTROENTEROLOGY ATLANTA, LLC
NPI 1891737532
Internal Medicine - Gastroenterology in Roswell, GA

Active since June 10, 2006
2006 MACY DR, ROSWELL, GA 30076(404) 257-0000 Get Directions Write a Review

NPPES record last updated: April 10, 2023. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Apr 10, 2023, Jan 16, 2019 (2 updates tracked since 2019).

About Gastroenterology Atlanta, Llc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GASTROENTEROLOGY ATLANTA, LLC (NPI 1891737532) is a healthcare organization registered as a gastroenterology in Roswell, Georgia and active in the NPI registry since June 2006. The organization lists William D Lyday, Owner, as its authorized official.

NPPES Registry Identity

NPI1891737532
Entity TypeOrganization
Primary Taxonomy207RG0100X
Legal Business NameGASTROENTEROLOGY ATLANTA, LLC
Location Address2006 MACY DRRoswell, GA 30076-6346
Mailing Address3025 Breckinridge BlvdDuluth, GA 30096-4979 · (678) 226-0082
Phone(404) 257-0000
Organization SubpartNo
Authorized OfficialWilliam D LydayOwner · (770) 400-6041
Enumeration DateJune 10, 2006
Last NPPES UpdateApril 10, 20232 updates tracked since enumeration
NPPES CertifiedApril 10, 2023
✔ NPI 1891737532 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in GA · 008698
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
2006 MACY DR, Roswell, GA 30076
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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Absolute Total Care, Ambetter Health, Ambetter of Alabama and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Gastroenterology Atlanta, Llc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to Gastroenterology Atlanta, LLC, which bills Medicare for the services they deliver. Of these, 1 practice at this address. They are listed nearest first.

Clinicians, nearest first (2)

William Lyday, MD
Gastroenterology
NPI 1134103195
2006 MACY DR
Roswell, GA 30076
(404) 257-0000
✔ PECOS✔ Accepts MedicareSame address
Charlotte Barr
Gastroenterology
NPI 1003551474
359 VILLAGE COMMONS BLVD
Georgetown, TX 78633
(512) 819-9500
✔ PECOS814 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 Gastroenterology Atlanta, LLC's NPI number?

The NPI number for Gastroenterology Atlanta, LLC is 1891737532. It was assigned to this organization in the NPPES registry on June 10, 2006.

Where is Gastroenterology Atlanta, LLC located?

Gastroenterology Atlanta, LLC is located at 2006 Macy Dr, Roswell, GA 30076. The listed phone number is (404) 257-0000.

What is Gastroenterology Atlanta, LLC's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Gastroenterology Atlanta, LLC enrolled in Medicare?

Yes. Gastroenterology Atlanta, LLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Gastroenterology Atlanta, LLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Gastroenterology, reassign their Medicare billing to Gastroenterology Atlanta, LLC. A 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 the clinician's services. Of these, 1 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

What insurance does Gastroenterology Atlanta, LLC accept?

Health plans from Ambetter Health, Ambetter from Absolute Total Care, Ambetter of Alabama, Ambetter of North Carolina and Ambetter of Tennessee list Gastroenterology Atlanta, LLC 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.

When was this NPI record last updated?

The NPPES record for Gastroenterology Atlanta, LLC was last updated on April 10, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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.