Neal Stefan Greenfield, MD
Critical Care Medicine (Internal Medicine) Physician · Winfield, IL
Neal Stefan Greenfield, MD is a critical care medicine (internal medicine) physician with a practice address in Winfield, Illinois, and NPI 1700094364, issued on May 18, 2007. Check the license (Illinois 036122989, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Neal Stefan Greenfield
- Credential
- MD
- Primary taxonomy
- Critical Care Medicine (Internal Medicine) Physician 207RC0200X
- License numbers
- 036122989 IL
MD28328 OR
0101242708 VA
MD 60002695 WA
Self-reported in NPPES; status is on the state search - Practice location
- 25 N Winfield RD, Winfield, IL 60190
- Phone
- (630) 933-4700
- Enumerated
- May 18, 2007
- Record last updated
- Mar 17, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (630) 933-4427
- Medicaid ID
- 036122989 IL
- Medicare enrollment
- Enrolled (PECOS I20120925000190); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest critical care medicine (internal medicine) physician records → All 281 in Illinois → Look up another NPI →
Also registered at 25 N Winfield RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Neal Stefan Greenfield 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 036122989Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The MIPS final score for 2023 (Medicare payment program): 94.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $29.29
1 payment: food and beverage; the largest payer was Abiomed. The 2,708 providers of this specialty with any payment received $2,958.68 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Central Dupage Physician GroupWheaton, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Neal Stefan Greenfield among 281 critical care medicine (internal medicine) physician records in Illinois
Neal Stefan Greenfield, 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 2007, is newer than 29% of them.
- NPI issued2007 · 29% of these records are older, 63% newer
- In a Medicare fileYes · 92% of these records are
- In the CMS Doctors and Clinicians fileYes · 80% of these records are
- Graduated2005 · median 2008 among the 226 with a school on file
- Record last updated2017 · 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).
12 critical care medicine (internal medicine) physician records list a practice address in Winfield
They are 12 of the 778 NPPES records with a practice address in Winfield, and 281 critical care medicine (internal medicine) physician records in Illinois.
All 281 in Illinois → Every provider in Winfield → Critical Care Medicine (Internal Medicine) Physician nationwide →
The 8 critical care medicine (internal medicine) physician records with the nearest ZIP codes
- Bartosz Buchcic, M.D.Winfield, IL 601901720303381
- Jonathan Cooke, M.D.Winfield, IL 601901235384298
- Carmel Goudzwaard, M.D.Winfield, IL 601901851547194
- Jeffrey Huml, MDWinfield, IL 601901407807035
- Katarzyna Kaczmarczyk, M.D.Winfield, IL 601901275979692
- Felix Ling, MDWinfield, IL 601901477728715
- Stephen Littleton, MDWinfield, IL 601901841200409
- Amir Marouni, M.D.Winfield, IL 601901619131364
Common questions
What is Neal Stefan Greenfield, MD's NPI number?
Neal Stefan Greenfield, MD's National Provider Identifier (NPI) is 1700094364, issued on May 18, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Neal Stefan Greenfield, MD located?
The NPPES record lists a practice address at 25 N Winfield RD, Winfield, IL, 60190. Phone: (630) 933-4700. Providers update this record themselves, so call before visiting.
How can I verify Neal Stefan Greenfield, MD's license?
NPPES lists Illinois license number 036122989, 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.
What is Neal Stefan Greenfield, MD's MIPS final score?
The 2023 MIPS final score is 94.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.