Tiffany Nicole Graybill, DO

NPI 1679754592ActiveIndividual· Internal Medicine· Gilbert, AZ

Internal Medicine (DO) in Gilbert, Arizona, trained at Midwestern University, Chicago College of Osteopathic Med (class of 2006). Their prescriptions cost Medicare Part D more than their services did: $290,702 for 2,213 claims, against $15,875 paid for services in 2024. Abbott Laboratories was the largest of 2 companies reporting payments in 2025, $42.84 in all, mostly food and beverage.

Overview

NPI	1679754592
Status	Active
Entity type	Individual
Credential	DO
Sole proprietor	No
NPI issued	Nov 19, 2007
Last updated in NPPES	Jan 16, 2012

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine Primary	207R00000X	005714	AZ
Internal Medicine	207R00000X	125-050861	IL
Internal Medicine	207R00000X	OP60139757	WA

About license numbers in NPPES

Exclusion screening

List	Result	Details
HHS-OIG LEIE · Oct 9, 2026	No match	Checked by NPI and by name + state
North Carolina Medicaid · Nov 10, 2026	No match	—
New York OMIG · Nov 10, 2026	No match	—
Ohio Medicaid · Nov 10, 2026	No match	—
Pennsylvania Medicheck · Nov 10, 2026	No match	—
Washington HCA · Nov 10, 2026	No match	—

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

Medicare

Enrollment (PECOS)	Enrolled Practitioner - Internal Medicine (AZ)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	110
Services billed	248 across 16 procedure codes
Paid by Medicare	$15,875

Part D prescriptions in 2024

Prescriptions (claims)	2,213 · 5,613 30-day fills
Patients	211
Total drug cost	$290,702
Generic share	80% of claims

Medicare sources and data years

Education and affiliations

Medical school	Midwestern University, Chicago College of Osteopathic Med
Graduation year	2006
Medicare specialty	Internal Medicine
Telehealth	Offers telehealth