Michael Edward Grzelak, M.D.
Hospitalist Physician · Winfield, IL
Michael Edward Grzelak, M.D. is a hospitalist physician with a practice address in Winfield, Illinois, and NPI 1386808913, issued on Jul 14, 2008. Check the license (Illinois 036124898, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Michael Edward Grzelak
- Credential
- M.D.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- 036124898 IL
Self-reported in NPPES; status is on the state search - Practice location
- 25 N Winfield RD, Winfield, IL 60190
- Phone
- (630) 933-4700
- Enumerated
- Jul 14, 2008
- Record last updated
- Jan 18, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (630) 933-4427
- Medicare enrollment
- Enrolled (PECOS I20101104001632); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 1,535 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 Michael Edward Grzelak 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 036124898Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average hospitalist physician in 2024
172 Medicare Part D claims for 98 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. 12 claims were for opioids.
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.
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).
Bills Medicare through one group practice
- Central Dupage Physician GroupWinfield, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Edward Grzelak among 1,535 hospitalist physician records in Illinois
Michael Edward Grzelak, M.D. is one of 1,535 hospitalist 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 2008, is newer than 19% of them.
- NPI issued2008 · 19% of these records are older, 74% newer
- In a Medicare fileYes · 92% of these records are
- In the CMS Doctors and Clinicians fileYes · 87% of these records are
- Graduated2007 · median 2013 among the 1,339 with a school on file
- Record last updated2018 · 32% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
74 hospitalist physician records list a practice address in Winfield
They are 74 of the 778 NPPES records with a practice address in Winfield, and 1,535 hospitalist physician records in Illinois.
All 1,535 in Illinois → Every provider in Winfield → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Anju Agarwal, DOWinfield, IL 601901952335671
- Nathan Bolden, M.D.Winfield, IL 601901124292727
- Joan Garvey, M.D.Winfield, IL 601901891989703
- Gail Gizzo-Waitley, MDWinfield, IL 601901518954270
- Patrick Gordon, MDWinfield, IL 601901538181375
- Victoria Greenfield, MDWinfield, IL 601901881801165
- John Hardek, M.D.Winfield, IL 601901710945126
- Kashif Janjua, M.D.Winfield, IL 601901558522730
Common questions
What is Michael Edward Grzelak, M.D.'s NPI number?
Michael Edward Grzelak, M.D.'s National Provider Identifier (NPI) is 1386808913, issued on Jul 14, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Michael Edward Grzelak, M.D. 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 Michael Edward Grzelak, M.D.'s license?
NPPES lists Illinois license number 036124898, 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 Michael Edward Grzelak, M.D. prescribe under Medicare Part D?
In 2024, Michael Edward Grzelak, M.D. had 172 Medicare Part D claims for 98 beneficiaries; the average among hospitalist physician prescribers was 521. Part D covers Medicare prescriptions only.
What is Michael Edward Grzelak, M.D.'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.