Jeff R. Willis, M.D.

NPI 1356385991ActiveIndividual· Internal Medicine, Gastroenterology· Missoula, MT

Internal Medicine, Gastroenterology (M.D.) in Missoula, Montana, trained at Virginia Commonwealth University, School of Medicine (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $279,156 for 795 claims, against $169,125 paid for services in 2024. Abbvie Inc. was the largest of 2 companies reporting payments in 2025, $36.02 in all, mostly food and beverage.

Overview

NPI	1356385991
Status	Active
Entity type	Individual
Credential	M.D.
Sole proprietor	No
NPI issued	Jun 15, 2006
Last updated in NPPES	Oct 7, 2024
Certified by provider	Oct 7, 2024

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Gastroenterology Primary	207RG0100X	56022	MT
Internal Medicine, Gastroenterology	207RG0100X	0101059226	VA

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 (MT)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	595
Services billed	5,214 across 50 procedure codes
Paid by Medicare	$169,125

Part D prescriptions in 2024

Prescriptions (claims)	795 · 1,097 30-day fills
Patients	493
Total drug cost	$279,156
Generic share	76% of claims

Medicare sources and data years

Education and affiliations

Medical school	Virginia Commonwealth University, School of Medicine
Graduation year	1990
Medicare specialty	Gastroenterology
Secondary specialties	Internal Medicine