Nathan Patrick Horvat, MD
Critical Care Medicine (Internal Medicine) Physician · Chicago, IL
Nathan Patrick Horvat, MD is a critical care medicine (internal medicine) physician with a practice address in Chicago, Illinois, and NPI 1407558877, issued on Mar 20, 2023. Check the license (Illinois 036.179732, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Nathan Patrick Horvat
- Credential
- MD
- Primary taxonomy
- Critical Care Medicine (Internal Medicine) Physician 207RC0200X
- License numbers
- 036.179732 IL
125.082224 IL
Self-reported in NPPES; status is on the state search - Practice location
- 600 S Paulina St Ste 403, Chicago, IL 60612
- Phone
- (312) 942-5000
- Enumerated
- Mar 20, 2023
- Record last updated
- May 7, 2026
- Entity
- Type 1 · individual
8 nearest critical care medicine (internal medicine) physician records → All 281 in Illinois → Look up another NPI →
Also registered at 600 S Paulina St Ste 403
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Nathan Patrick Horvat 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 036.179732Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average critical care medicine (internal medicine) physician in 2024
58 Medicare Part D claims for 25 beneficiaries, against an average of 696 among the 2,873 providers of this specialty who prescribed in Part D.
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.
Nathan Patrick Horvat among 281 critical care medicine (internal medicine) physician records in Illinois
Nathan Patrick Horvat, MD is one of 281 critical care medicine (internal medicine) physician records with a practice address in Illinois. 92% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 98% of them.
- NPI issued2023 · 98% of these records are older, under 1% newer
- In a Medicare fileYes · 92% of these records are
- In the CMS Doctors and Clinicians fileNo · 80% of these records are
- Record last updated2026 · 22% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0200X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Critical Care Medicine (Internal Medicine) Physician providers in Illinois
There are 281 critical care medicine (internal medicine) physician records in Illinois.
All 281 in Illinois → Every provider in Chicago → Critical Care Medicine (Internal Medicine) Physician nationwide →
The 8 critical care medicine (internal medicine) physician records with the nearest ZIP codes
- Foster Adams, D.O.Chicago, IL 606121376938977
- Cristina Bardita, MD, PHDChicago, IL 606121861809295
- William Chamberlin, MDChicago, IL 606121194820514
- Sydney Hyder, M.D.Chicago, IL 606121033645478
- Min Joo, MDChicago, IL 606121699722777
- Vassyl Lonchyna, MDChicago, IL 606121144412677
- Melvin Lopata, M.D.Chicago, IL 606121932142528
- Shubha Mathur, DOChicago, IL 606121922568377
Common questions
What is Nathan Patrick Horvat, MD's NPI number?
Nathan Patrick Horvat, MD's National Provider Identifier (NPI) is 1407558877, issued on Mar 20, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Nathan Patrick Horvat, MD located?
The NPPES record lists a practice address at 600 S Paulina St Ste 403, Chicago, IL, 60612. Phone: (312) 942-5000. Providers update this record themselves, so call before visiting.
How can I verify Nathan Patrick Horvat, MD's license?
NPPES lists Illinois license number 036.179732, 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 Nathan Patrick Horvat, MD prescribe under Medicare Part D?
In 2024, Nathan Patrick Horvat, MD had 58 Medicare Part D claims for 25 beneficiaries; the average among critical care medicine (internal medicine) physician prescribers was 696. 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.