Richard T. Riegel, MD

NPI 1669472700ActiveIndividual· Internal Medicine, Gastroenterology· Chesterfield, MO

Internal Medicine, Gastroenterology (MD) in Chesterfield, Missouri, trained at University of Missouri, Columbia School of Medicine (class of 1991). Their prescriptions cost Medicare Part D more than their services did: $660,063 for 1,331 claims, against $146,591 paid for services in 2024. Abbvie Inc. was the largest of 3 companies reporting payments in 2025, $97.66 in all, mostly food and beverage.

Overview

NPI	1669472700
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	No
NPI issued	Jul 29, 2005
Last updated in NPPES	Oct 21, 2026
Certified by provider	Oct 21, 2026

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Gastroenterology Primary	207RG0100X	105536	MO

About license numbers in NPPES

Exclusion screening

List	Result	Details
HHS-OIG LEIE · Nov 10, 2026	No match	Checked by NPI and by name + state
North Carolina Medicaid · Nov 11, 2026	No match	—
New York OMIG · Nov 11, 2026	No match	—
Ohio Medicaid · Nov 11, 2026	No match	—
Pennsylvania Medicheck · Nov 11, 2026	No match	—
Washington HCA · Nov 11, 2026	No match	—

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

Medicare

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

Medicare services in 2024

Medicare patients	536
Services billed	2,771 across 47 procedure codes
Paid by Medicare	$146,591

Part D prescriptions in 2024

Prescriptions (claims)	1,331 · 2,690 30-day fills
Patients	528
Total drug cost	$660,063
Generic share	81% of claims

Medicare sources and data years

Education and affiliations

Medical school	University of Missouri, Columbia School of Medicine
Graduation year	1991
Medicare specialty	Gastroenterology
Secondary specialties	Internal Medicine