Geoffrey Alan Fillmore, D.O.

NPI 1013022680ActiveIndividual· Internal Medicine, Gastroenterology· Tulsa, OK

Internal Medicine, Gastroenterology (D.O.) in Tulsa, Oklahoma, trained at Oklahoma State University College of Osteopathic Medicine (class of 2004). Their prescriptions cost Medicare Part D more than their services did: $453,644 for 868 claims, against $170,748 paid for services in 2024. Abbvie Inc. was the largest of 11 companies reporting payments in 2025, $807.61 in all, mostly food and beverage.

Overview

NPI	1013022680
Status	Active
Entity type	Individual
Credential	D.O.
Sole proprietor	No
NPI issued	Aug 21, 2006
Last updated in NPPES	Apr 28, 2022
Certified by provider	Apr 28, 2022

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Gastroenterology Primary	207RG0100X	4981	OK
Internal Medicine	207R00000X	M3541	TX

About license numbers in NPPES

Exclusion screening

List	Result	Details
HHS-OIG LEIE · Oct 9, 2026	No match	Checked by NPI and by name + state
North Carolina Medicaid · Nov 4, 2026	No match	—
New York OMIG · Nov 4, 2026	No match	—
Ohio Medicaid · Nov 4, 2026	No match	—
Pennsylvania Medicheck · Nov 4, 2026	No match	—
Washington HCA · Nov 4, 2026	No match	—

Official OIG search · How matching works ·Bulk check a roster

Medicare

Enrollment (PECOS)	Enrolled Practitioner - Gastroenterology (OK)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	414
Services billed	7,903 across 48 procedure codes
Paid by Medicare	$170,748

Part D prescriptions in 2024

Prescriptions (claims)	868 · 1,571 30-day fills
Patients	396
Total drug cost	$453,644
Generic share	74% of claims

Medicare sources and data years

Education and affiliations

Medical school	Oklahoma State University College of Osteopathic Medicine
Graduation year	2004
Medicare specialty	Gastroenterology
Secondary specialties	Internal Medicine
Telehealth	Offers telehealth