ADULT GASTROENTEROLOGY ASSOCIATES INC
NPI 1306884812
Internal Medicine - Gastroenterology in Tulsa, OK
About Adult Gastroenterology Associates Inc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ADULT GASTROENTEROLOGY ASSOCIATES INC (NPI 1306884812) is a healthcare organization registered as a gastroenterology in Tulsa, Oklahoma and active in the NPI registry since June 2006. The organization lists Douglas B Kliewer, Physician, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Adult Gastroenterology Associates Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Revalidation Due Date
Revalidation due by February 28, 2027
Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.
Clinicians Billing Medicare Through This Organization
18Medicare enrollment records show 18 clinicians reassign Medicare billing to Adult Gastroenterology Associates Inc, which bills Medicare for the services they deliver. Of these, 3 practice at this address and 17 within 10 miles. They are listed nearest first.
Clinicians by Medicare Specialty 3
Clinicians, nearest first (18)
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 Adult Gastroenterology Associates Inc's NPI number?
The NPI number for Adult Gastroenterology Associates Inc is 1306884812. It was assigned to this organization in the NPPES registry on June 4, 2006.
Where is Adult Gastroenterology Associates Inc located?
Adult Gastroenterology Associates Inc is located at 4200 E Skelly Dr Ste 700, Tulsa, OK 74135. The listed phone number is (918) 438-7050.
What is Adult Gastroenterology Associates Inc's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Adult Gastroenterology Associates Inc enrolled in Medicare?
Yes. Adult Gastroenterology Associates Inc is registered in the Medicare PECOS enrollment system.
When is Adult Gastroenterology Associates Inc's Medicare revalidation due?
According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (Oklahoma, Clinic/Group Practice) is due for revalidation by February 28, 2027. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.
How many clinicians bill Medicare through Adult Gastroenterology Associates Inc?
According to the CMS Revalidation Reassignment List (October 2026 release), 18 clinicians in 3 Medicare specialties reassign their Medicare billing to Adult Gastroenterology Associates Inc. 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. The largest specialties are Gastroenterology (10), Nurse Practitioner (6) and Internal Medicine (2). Of these, 3 practice at this address and 17 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
What insurance does Adult Gastroenterology Associates Inc accept?
Health plans from Ambetter Health, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan, Ambetter from Superior HealthPlan and Ambetter of Oklahoma list Adult Gastroenterology Associates Inc 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 Adult Gastroenterology Associates Inc was last updated on October 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 days 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.
# Adult Gastroenterology Associates Inc · NPI 1306884812
Gastroenterology organization in Tulsa, Oklahoma. Organization record, active in the CMS NPPES registry since June 4, 2006.
## Identity
- **NPI:** 1306884812 (Entity type: Organization)
- **Enumerated:** June 4, 2006
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **Organization subpart:** No
- **Authorized official:** Douglas Kliewer, PHYSICIAN
## Practice location
- **Address:** 4200 E SKELLY DR STE 700, Tulsa, OK 74135-3256
- **Phone:** (918) 438-7050 · **Fax:** (918) 221-0835
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** February 28, 2027 (Non-DME Part B, Oklahoma, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 18 clinicians in 3 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Gastroenterology (10), Nurse Practitioner (6), Internal Medicine (2); 3 practice at this address and 17 within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** October 6, 2026
- **Other identifiers:** Medicaid 100740890A (OK)
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Source: [NPI Profile](https://npiprofile.com/npi/1306884812) · Data from the CMS NPPES public registry.