Fred Harrison Williams, MD

NPI 1386644326ActiveIndividual· Internal Medicine, Gastroenterology· Chesterfield, MO

Internal Medicine, Gastroenterology (MD) in Chesterfield, Missouri, trained at University of Missouri, Kansas City, School of Medicine (class of 1986). Their prescriptions cost Medicare Part D more than their services did: $130,317 for 478 claims, against $17,265 paid for services in 2024. Lilly USA, LLC was the largest of 2 companies reporting payments in 2024, $140.01 in all, mostly food and beverage.

Overview

NPI	1386644326
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	118411	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	131
Services billed	195 across 23 procedure codes
Paid by Medicare	$17,265

Part D prescriptions in 2024

Prescriptions (claims)	478 · 1,102 30-day fills
Patients	193
Total drug cost	$130,317
Generic share	87% of claims

Medicare sources and data years

Education and affiliations

Medical school	University of Missouri, Kansas City, School of Medicine
Graduation year	1986
Medicare specialty	Gastroenterology
Secondary specialties	Internal Medicine