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CONOR PATRICK O'HALLORAN
NPI 1265894141
Pediatrics - Pediatric Cardiology in Chicago, IL

Active since March 22, 2016PECOS Enrolled
225 E CHICAGO AVE, CHICAGO, IL 60611(800) 543-7362 Get Directions Write a Review

NPPES record last updated: August 5, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Aug 5, 2026, Mar 22, 2016 (2 updates tracked since 2016).

About Conor Patrick O'halloran NPPES

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

CONOR PATRICK O'HALLORAN (NPI 1265894141) is an individual pediatric cardiology provider in Chicago, Illinois, licensed in Illinois (036148582) and active in the NPI registry since March 2016. He is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of University Of Wisconsin School Of Medicine (2016).

NPPES Registry Identity

NPI1265894141
Entity TypeIndividualMale
Primary Taxonomy2080P0202X
Provider Legal NameCONOR PATRICK O'HALLORAN
Location Address225 E CHICAGO AVEChicago, IL 60611-2991
Mailing Address225 E Chicago AveChicago, IL 60611-2991 · (800) 543-7362
Phone(800) 543-7362
Sole ProprietorNo
Medical School CMSUniversity Of Wisconsin School Of MedicineGraduated 2016
Enumeration DateMarch 22, 2016
Last NPPES UpdateAugust 5, 20262 updates tracked since enumeration
NPPES CertifiedAugust 5, 2026
✔ NPI 1265894141 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Pediatric CardiologyAllopathic & Osteopathic Physicians
Taxonomy Code2080P0202X
License✔ Licensed in IL · 036148582
Definition
A pediatric cardiologist provides comprehensive care to patients with cardiovascular problems. This specialist is skilled in selecting, performing and evaluating the structural and functional assessment of the heart and blood vessels, and the clinical evaluation of cardiovascular disease.
225 E CHICAGO AVE, Chicago, IL 60611
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Secondary Practice Locations 3

Location 12515 N Clark StChicago, IL 60614-2730 · Phone (312) 227-4100
Location 2251 E Huron StChicago, IL 60611-2908 · Phone (312) 227-4100
Location 31620 W Harrison StChicago, IL 60612-3801 · Phone (312) 227-4000

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Conor Patrick O'halloran is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID547739773
PECOS Enrollment IDI20260518002248
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 Conor O'halloran reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Lurie Children's Medical Group Inc
Same address
Pediatrics
225 E CHICAGO AVE
Chicago, IL 60611
  • Reassigned Medicare billing, Illinois enrollment
  • 826 clinicians in this Medicare group
NPI 1518064716 (312) 227-6412

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.

BESSEY ELIZABETH JOSE GEEVARGHESE DO
Pediatrics
225 E CHICAGO AVE
CHICAGO, IL 60611
Cook County (630) 933-6631
CHRISTINA SOOJIN KIM M.D.
Pediatrics
225 E CHICAGO AVE
CHICAGO, IL 60611
Cook County (443) 928-7458
JESSICA LAUREN OFFENBACH APN
Nurse Practitioner (Pediatrics)
225 E CHICAGO AVE
CHICAGO, IL 60611
Cook County (312) 227-4000
MS. JENNY KO LEE APN
Nurse Practitioner (Neonatal)
225 E CHICAGO AVE
CHICAGO, IL 60611
Cook County (847) 962-6268
ERIN COHEN MD
Pediatrics (Hospice and Palliative Medicine)
225 E CHICAGO AVE
CHICAGO, IL 60611
Cook County (312) 227-4000
DR. JOSEPH HART COLLINS MD
Psychiatry & Neurology (Neurology with Special Qualifications in Child Neurology)
225 E CHICAGO AVE
CHICAGO, IL 60611
Cook County (312) 227-3550
ALEXIS LYN HARMON
Student in an Organized Health Care Education/Training Program
225 E CHICAGO AVE
CHICAGO, IL 60611
Cook County (312) 227-4000
SHANNON JULIA CONWAY MD
Student in an Organized Health Care Education/Training Program
225 E CHICAGO AVE
CHICAGO, IL 60611
Cook County (312) 227-4000

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 Conor O'halloran's NPI number?

The NPI number for Conor O'halloran is 1265894141. It was assigned to this individual provider in the NPPES registry on March 22, 2016.

Where is Conor O'halloran located?

Conor O'halloran practices at 225 E Chicago Ave, Chicago, IL 60611. The listed phone number is (800) 543-7362.

What is Conor O'halloran's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Cardiology, with taxonomy code 2080P0202X.

Is Conor O'halloran enrolled in Medicare?

Yes. Conor O'halloran is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Conor O'halloran's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Conor O'halloran reassigns Medicare benefits to Lurie Children's Medical Group Inc (Chicago, 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 Conor O'halloran'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 Conor O'halloran was last updated on August 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.