John Matthew Castor, MD

NPI 1093987257ActiveIndividual· Internal Medicine, Gastroenterology· Columbus, OH

Internal Medicine, Gastroenterology (MD) in Columbus, Ohio, trained at Clvlnd Clinic Lerner College of Med of Case Wstn Rsv University (class of 2005). Their prescriptions cost Medicare Part D more than their services did: $539,528 for 1,061 claims, against $63,595 paid for services in 2024. Abbvie Inc. was the largest of 2 companies reporting payments in 2025, $304.77 in all, mostly food and beverage.

Overview

NPI	1093987257
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	No
NPI issued	Mar 27, 2008
Last updated in NPPES	Nov 2, 2023
Certified by provider	Nov 2, 2023

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Gastroenterology Primary	207RG0100X	35097145	OH

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 (OH)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	422
Services billed	603 across 39 procedure codes
Paid by Medicare	$63,595

Part D prescriptions in 2024

Prescriptions (claims)	1,061 · 1,579 30-day fills
Patients	550
Total drug cost	$539,528
Generic share	89% of claims

Medicare sources and data years

Education and affiliations

Medical school	Clvlnd Clinic Lerner College of Med of Case Wstn Rsv University
Graduation year	2005
Medicare specialty	Gastroenterology
Telehealth	Offers telehealth