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MARGARET BESLER NAGEL M.D.
NPI 1841677051
Pediatrics - Pediatric Hematology-Oncology in Peoria, IL

Active since April 27, 2015PECOS Enrolled
530 NE GLEN OAK AVE, PEORIA, IL 61637(309) 624-4945 Get Directions Write a Review

NPPES record last updated: January 16, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jan 16, 2026, Nov 29, 2022, Feb 11, 2020 (3 updates tracked since 2020).

About Margaret Besler Nagel M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARGARET BESLER NAGEL M.D. (NPI 1841677051) is an individual pediatric hematology-oncology provider in Peoria, Illinois, licensed in Texas (T9190) and active in the NPI registry since April 2015. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1841677051
Entity TypeIndividualFemale
Primary Taxonomy2080P0207X
Provider Legal NameMARGARET BESLER NAGELCredential: M.D.
Location Address530 NE GLEN OAK AVEPeoria, IL 61637-0001
Mailing Address530 Ne Glen Oak AvePeoria, IL 61637-0001 · (309) 624-4945
Phone(309) 624-4945
Sole ProprietorNo
Enumeration DateApril 27, 2015
Last NPPES UpdateJanuary 16, 20263 updates tracked since enumeration
NPPES CertifiedJanuary 16, 2026
✔ NPI 1841677051 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 5

★ Primary SpecialtyPediatrics · Pediatric Hematology-OncologyAllopathic & Osteopathic Physicians
Taxonomy Code2080P0207X
Licenses✔ Licensed in TX · T9190✔ Licensed in IL · 036168262
Definition
A pediatrician trained in the combination of pediatrics, hematology and oncology to recognize and manage pediatric blood disorders and cancerous diseases.
Also ListedEmergency MedicineTaxonomy 207P00000X · License 56144 (TN)
Also ListedPediatricsTaxonomy 208000000X · License 56144 (TN)
Also ListedPediatrics · Pediatric Emergency MedicineTaxonomy 2080P0204X · License 56144 (TN)
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
530 NE GLEN OAK AVE, Peoria, IL 61637
Open in Google Maps ↗

Other Names 1

Former Name (1)Margaret Frances Besler Md

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Margaret Besler Nagel M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Margaret Nagel reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Board Of Trustees Of The University Of Illinois
0.5 mi
Pediatrics
1 ILLINI DR
Peoria, IL 61605
  • Reassigned Medicare billing, Illinois enrollment
  • 2,127 clinicians in this Medicare group
NPI 1467425322 (309) 680-8649

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. HAMID MAHMOOD ZIA M.D
Pathology (Anatomic Pathology & Clinical Pathology)
530 NE GLEN OAK AVE, CENTRAL ILLINOIS PATHOLOGY SC
PEORIA, IL 61637
Peoria County (309) 624-9011
THOMAS JAMES MCMORROW MD
Pediatrics
530 NE GLEN OAK AVE
PEORIA, IL 61637
Peoria County (309) 655-2553
ALEXANDRA ROPER MD
Surgery
530 NE GLEN OAK AVE
PEORIA, IL 61637
Peoria County (309) 655-2000
JAPMEHR KAUR SANDHU M.B.B.S.
Student in an Organized Health Care Education/Training Program
530 NE GLEN OAK AVE
PEORIA, IL 61637
Peoria County (309) 624-9351
THOMAS BLACKWELL JR. MD
Student in an Organized Health Care Education/Training Program
530 NE GLEN OAK AVE
PEORIA, IL 61637
Peoria County (309) 655-2000
LUKE KLOFT
Student in an Organized Health Care Education/Training Program
530 NE GLEN OAK AVE
PEORIA, IL 61637
Peoria County (309) 655-2109
ABIGAIL V. WELU DO
Student in an Organized Health Care Education/Training Program
530 NE GLEN OAK AVE
PEORIA, IL 61637
Peoria County (309) 655-6710
DR. JAMES DANIEL DEWAR D.O.
Internal Medicine (Interventional Cardiology)
530 NE GLEN OAK AVE
PEORIA, IL 61637
Peoria County (309) 655-7257

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Margaret Nagel's NPI number?

The NPI number for Margaret Nagel is 1841677051. It was assigned to this individual provider in the NPPES registry on April 27, 2015. The provider is also known as Margaret Frances Besler MD.

Where is Margaret Nagel located?

Margaret Nagel practices at 530 NE Glen Oak Ave, Peoria, IL 61637. The listed phone number is (309) 624-4945.

What is Margaret Nagel's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Hematology-Oncology, with taxonomy code 2080P0207X.

Is Margaret Nagel enrolled in Medicare?

Yes. Margaret Nagel is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Margaret Nagel's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Nagel reassigns Medicare benefits to Board Of Trustees Of The University Of Illinois (Peoria, IL). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Margaret Nagel's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Margaret Nagel was last updated on January 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.