Gregory C. Castello, D.O.

NPI 1417939323ActiveIndividual· Family Medicine· Lombard, IL

Family Medicine (D.O.) in Lombard, Illinois, trained at Midwestern University, Chicago College of Osteopathic Med (class of 1993). In 2024 Medicare paid $303,421 for 197 patients, and Part D covered 1,321 of their prescriptions, 87% of them generic. Astrazeneca Pharmaceuticals LP was the largest of 8 companies reporting payments in 2025, $566.66 in all, mostly food and beverage.

Overview

NPI	1417939323
Status	Active
Entity type	Individual
Credential	D.O.
Sole proprietor	No
NPI issued	Nov 16, 2005
Last updated in NPPES	Oct 29, 2026
Certified by provider	Oct 29, 2026

Specialties and licenses

Taxonomy	Code	License	State
Family Medicine Primary	207Q00000X	036091537	IL

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 - Family Practice (IL)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	197
Services billed	34,860 across 15 procedure codes
Paid by Medicare	$303,421

Part D prescriptions in 2024

Prescriptions (claims)	1,321 · 3,385 30-day fills
Patients	122
Total drug cost	$156,177
Generic share	87% of claims

Medicare sources and data years

Education and affiliations

Medical school	Midwestern University, Chicago College of Osteopathic Med
Graduation year	1993
Medicare specialty	Family Practice
Telehealth	Offers telehealth