David Alan Khan, MD

NPI 1891757688ActiveIndividual· Internal Medicine, Allergy & Immunology· Dallas, TX

Internal Medicine, Allergy & Immunology (MD) in Dallas, Texas, trained at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) (class of 1988). Their prescriptions cost Medicare Part D more than their services did: $1,247,335 for 440 claims, against $13,843 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 2 companies reporting payments in 2025, $230.92 in all, mostly food and beverage.

Overview

NPI	1891757688
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	No
NPI issued	Apr 5, 2006
Last updated in NPPES	Apr 3, 2008

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Allergy & Immunology Primary	207RA0201X	J5799	TX

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 4, 2026	No match	—
New York OMIG · Nov 4, 2026	No match	—
Ohio Medicaid · Nov 4, 2026	No match	—
Pennsylvania Medicheck · Nov 4, 2026	No match	—
Washington HCA · Nov 4, 2026	No match	—

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

Medicare

Enrollment (PECOS)	Enrolled Practitioner - Allergy/Immunology (TX)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	122
Services billed	247 across 18 procedure codes
Paid by Medicare	$13,843

Part D prescriptions in 2024

Prescriptions (claims)	440 · 605 30-day fills
Patients	80
Total drug cost	$1,247,335
Generic share	42% of claims

Medicare sources and data years

Education and affiliations

Medical school	University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb)
Graduation year	1988
Medicare specialty	Allergy/Immunology
Secondary specialties	Internal Medicine
Telehealth	Offers telehealth