Siobhan Proksell, MD

NPI 1184990079ActiveIndividual· Internal Medicine, Gastroenterology· Aurora, CO

Internal Medicine, Gastroenterology (MD) in Aurora, Colorado, trained at University of Miami, Lm Miller School of Medicine (class of 2012). Their prescriptions cost Medicare Part D more than their services did: $2,556,078 for 387 claims, against $27,534 paid for services in 2024. Daiichi Sankyo Inc. was the largest of 3 companies reporting payments in 2025, $48.54 in all, mostly food and beverage.

Overview

NPI	1184990079
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	No
NPI issued	Mar 26, 2012
Last updated in NPPES	Jul 10, 2025
Certified by provider	Jul 10, 2025

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Gastroenterology Primary	207RG0100X	DR.0075489	CO
Internal Medicine, Gastroenterology	207RG0100X	ME147737	FL
Internal Medicine, Gastroenterology	207RG0100X	MD460696	PA

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 (CO); Practitioner - Gastroenterology (FL)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	165
Services billed	373 across 30 procedure codes
Paid by Medicare	$27,534

Part D prescriptions in 2024

Prescriptions (claims)	387 · 522 30-day fills
Patients	91
Total drug cost	$2,556,078
Generic share	46% of claims

Medicare sources and data years

Education and affiliations

Medical school	University of Miami, Lm Miller School of Medicine
Graduation year	2012
Medicare specialty	Gastroenterology
Secondary specialties	Internal Medicine
Telehealth	Offers telehealth