Nathaniel Joseph Leonardi, DO
Nephrology Physician · Chicago, IL
Nathaniel Joseph Leonardi, DO is a nephrology physician with a practice address in Chicago, Illinois, and NPI 1427685445, issued on Mar 27, 2020. Check the license (Illinois 036.179518, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Nathaniel Joseph Leonardi
- Credential
- DO
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- 036.179518 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1725 W Harrison St Ste 161, Chicago, IL 60612
- Phone
- (312) 942-4252
- Enumerated
- Mar 27, 2020
- Record last updated
- May 4, 2026
- Medicare enrollment
- Enrolled (PECOS I20250718000463); accepts Medicare assignment
- Medical or professional school
- At Still Un Of Hlth Sciences, Col Of Osteo Med, Mesa, 2020
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 572 in Illinois → Look up another NPI →
Also registered at 1725 W Harrison St Ste 161
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Lauren GrangerPhysician Assistant1285482299
- Michael Hulburt, DNPAcute Care Nurse Practitioner1811791239
- Douglas Krysan, PA-CMedical Physician Assistant1316343296
- Veronica Loy, DOHepatology Physician1972780013
- Bridget MehtaAcute Care Nurse Practitioner1588474621
Verify Nathaniel Joseph Leonardi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036.179518Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average nephrology physician in 2024
91 Medicare Part D claims for 28 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D.
Most prescribed
- Jardiance11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Unmc PhysiciansOmaha, NE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathaniel Joseph Leonardi among 572 nephrology physician records in Illinois
Nathaniel Joseph Leonardi, DO is one of 572 nephrology physician records with a practice address in Illinois. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 92% of them.
- NPI issued2020 · 92% of these records are older, 6% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 76% of these records are
- Graduated2020 · median 2002 among the 433 with a school on file
- Record last updated2026 · 39% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in Illinois
There are 572 nephrology physician records in Illinois.
All 572 in Illinois → Every provider in Chicago → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Angelito Bernardo, MDChicago, IL 606121578624854
- Carolyn Brecklin, M.D.Chicago, IL 606121811918964
- Michael FischerChicago, IL 606121013012277
- Amit Joshi, M.D.Chicago, IL 606121982807814
- James LashChicago, IL 606121548365646
- Jerrold LevineChicago, IL 606121568575918
- Claudia Lora, M.D.Chicago, IL 606121588867410
- Albert Osei, M.D.Chicago, IL 606121740211150
Common questions
What is Nathaniel Joseph Leonardi, DO's NPI number?
Nathaniel Joseph Leonardi, DO's National Provider Identifier (NPI) is 1427685445, issued on Mar 27, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Nathaniel Joseph Leonardi, DO located?
The NPPES record lists a practice address at 1725 W Harrison St Ste 161, Chicago, IL, 60612. Phone: (312) 942-4252. Providers update this record themselves, so call before visiting.
How can I verify Nathaniel Joseph Leonardi, DO's license?
NPPES lists Illinois license number 036.179518, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nathaniel Joseph Leonardi, DO prescribe under Medicare Part D?
In 2024, Nathaniel Joseph Leonardi, DO had 91 Medicare Part D claims for 28 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.