ADVANCED GASTROENTEROLOGY ASSOCIATES
NPI 1003199076
Internal Medicine - Gastroenterology in Crystal River, FL
About Advanced Gastroenterology Associates NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ADVANCED GASTROENTEROLOGY ASSOCIATES (NPI 1003199076) is a healthcare organization registered as a gastroenterology in Crystal River, Florida and active in the NPI registry since September 2011. The organization holds a CLIA Waiver certificate valid through December 16, 2026 and lists Barrett Jeffrey Wallis, Owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Other Identifiers 2
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Advanced Gastroenterology Associates is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
2Medicare enrollment records show 2 clinicians reassign Medicare billing to Advanced Gastroenterology Associates, which bills Medicare for the services they deliver. Of these, 1 practice at this address. They are listed nearest first.
Clinicians, nearest first (2)
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Waiver 10D2051281
Advanced Gastroenterology · Crystal River, FLFrequently 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 B Jeffrey Wallis MD PA's NPI number?
The NPI number for B Jeffrey Wallis MD PA is 1003199076. It was assigned to this organization in the NPPES registry on September 26, 2011. The provider is doing business as Advanced Gastroenterology Associates.
Where is B Jeffrey Wallis MD PA located?
B Jeffrey Wallis MD PA is located at 6152 W Corporate Oaks Dr, Crystal River, FL 34429. The listed phone number is (352) 564-3900.
What is B Jeffrey Wallis MD PA's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is B Jeffrey Wallis MD PA enrolled in Medicare?
Yes. B Jeffrey Wallis MD PA is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through B Jeffrey Wallis MD PA?
According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians reassign their Medicare billing to B Jeffrey Wallis MD PA, in Certified Registered Nurse Anesthetist (CRNA) and Gastroenterology. 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.
Does B Jeffrey Wallis MD PA hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 10D2051281) is associated with this NPI, valid through December 16, 2026. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for B Jeffrey Wallis MD PA was last updated on August 7, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Advanced Gastroenterology Associates · NPI 1003199076
Gastroenterology organization in Crystal River, Florida. Organization record, active in the CMS NPPES registry since September 26, 2011.
## Identity
- **NPI:** 1003199076 (Entity type: Organization)
- **Enumerated:** September 26, 2011
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **Legal business name:** B Jeffrey Wallis Md Pa
- **Organization subpart:** No
- **Authorized official:** Barrett Wallis, OWNER
## Practice location
- **Address:** 6152 W CORPORATE OAKS DR, Crystal River, FL 34429-8722
- **Phone:** (352) 564-3900 · **Fax:** (352) 564-3903
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 2 clinicians in 2 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Certified Registered Nurse Anesthetist (CRNA) (1), Gastroenterology (1); 1 practice at this address · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** August 7, 2012
- **Other identifiers:** Medicaid 001690000 (FL); Medicare UPIN 50520 (FL)
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1003199076) · Data from the CMS NPPES public registry.