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DR. NATHANIEL JOSEPH LEONARDI DO
NPI 1427685445
Internal Medicine - Nephrology in Chicago, IL

Active since March 27, 2020PECOS EnrolledAccepts Medicare Assignment
1725 W HARRISON ST STE 161, CHICAGO, IL 60612(312) 942-4252 Get Directions Write a Review

NPPES record last updated: May 4, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: May 4, 2026, Mar 27, 2020 (2 updates tracked since 2020).

About Dr. Nathaniel Joseph Leonardi Do NPPES

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

DR. NATHANIEL JOSEPH LEONARDI DO (NPI 1427685445) is an individual nephrology provider in Chicago, Illinois, licensed in Illinois (036.179518) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS, is affiliated with The Nebraska Medical Center, and is a graduate of At Still Un Of Hlth Sciences, Col Of Osteo Med, Mesa (2020).

NPPES Registry Identity

NPI1427685445
Entity TypeIndividualMale
Primary Taxonomy207RN0300X
Provider Legal NameDR. NATHANIEL JOSEPH LEONARDICredential: DO
Location Address1725 W HARRISON ST STE 161Chicago, IL 60612-3861
Mailing Address1725 W Harrison St Ste 161Chicago, IL 60612-3861 · (312) 942-4252
Phone(312) 942-4252
Sole ProprietorNo
Medical School CMSAt Still Un Of Hlth Sciences, Col Of Osteo Med, MesaGraduated 2020
Enumeration DateMarch 27, 2020
Last NPPES UpdateMay 4, 20262 updates tracked since enumeration
NPPES CertifiedMay 4, 2026
✔ NPI 1427685445 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
License✔ Licensed in IL · 036.179518
Definition
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
1725 W HARRISON ST STE 161, Chicago, IL 60612
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Nebraska, Medica, Oscar Insurance Company.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Nathaniel Joseph Leonardi Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID6709200215
PECOS Enrollment IDI20250718000463
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.

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

The Nebraska Medical Center

Acute Care Hospitals · Omaha, NE
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number280013
Location987400 Nebraska Medical CenterOmaha, NE 68198 · Douglas County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60612 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$138.86 typical visit price
range $60.08 – $183.39
Typical copayment $34.71 (range $15.02 – $45.84)
Most-billed visit code 99204
Established Patient
$105.70 typical visit price
range $18.97 – $148.12
Typical copayment $26.42 (range $4.74 – $37.03)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 12

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

DR. LLOYD GARTH BROWN M.D.
Transplant Surgery
1725 W HARRISON ST STE 161
CHICAGO, IL 60612
Cook County (312) 942-5242
NATHALIE SELA MD
Transplant Surgery
1725 W HARRISON ST STE 161
CHICAGO, IL 60612
Cook County (312) 942-5242
ANDREA PABON
Nurse Practitioner (Primary Care)
1725 W HARRISON ST STE 161
CHICAGO, IL 60612
Cook County (312) 942-4252
LAUREN GRANGER
Physician Assistant
1725 W HARRISON ST STE 161
CHICAGO, IL 60612
Cook County (312) 942-2452
DR. SHILPA PEDAPATI M.D
Internal Medicine (Nephrology)
1725 W HARRISON ST STE 161
CHICAGO, IL 60612
Cook County (312) 942-4252
MR. DOUGLAS KRYSAN PA-C
Physician Assistant (Medical)
1725 W HARRISON ST STE 161
CHICAGO, IL 60612
Cook County (312) 563-2875
KANDI LEE SCHMIDT PHD
Psychologist (Clinical)
1725 W HARRISON ST STE 161
CHICAGO, IL 60612
Cook County (312) 942-4252
LINDSEY CHRISTINE SLOAN PA-C
Physician Assistant
1725 W HARRISON ST STE 161
CHICAGO, IL 60612
Cook County (312) 942-4252

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 Nathaniel Leonardi's NPI number?

The NPI number for Nathaniel Leonardi is 1427685445. It was assigned to this individual provider in the NPPES registry on March 27, 2020.

Where is Nathaniel Leonardi located?

Nathaniel Leonardi practices at 1725 W Harrison St Ste 161, Chicago, IL 60612. The listed phone number is (312) 942-4252.

What is Nathaniel Leonardi's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Nathaniel Leonardi enrolled in Medicare?

Yes. Nathaniel Leonardi is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Nathaniel Leonardi accept?

Health plans from Blue Cross and Blue Shield of Nebraska, Medica and Oscar Insurance Company list Nathaniel Leonardi as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Nathaniel Leonardi affiliated with any hospitals?

According to CMS data, Nathaniel Leonardi is affiliated with The Nebraska Medical Center.

When was this NPI record last updated?

The NPPES record for Nathaniel Leonardi was last updated on May 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.