Greg Donald Ewert, M.D.
Internal Medicine Physician · Chicago, IL
Greg Donald Ewert, M.D. is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1376591974, issued on May 5, 2006. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Greg Donald Ewert
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- Practice location
- 200 S Michigan Ave, Chicago, IL 60604
- Phone
- (312) 922-3815
- Enumerated
- May 5, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (312) 922-3789
- Medicare enrollment
- Enrolled (PECOS I20101215000421); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 1986
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
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Verify Greg Donald Ewert in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional RegulationCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
51% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,559 Medicare Part D claims for 136 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 39 claims were for opioids.
Most prescribed
- Atorvastatin Calcium196 claims
- Lisinopril94 claims
- Rosuvastatin Calcium93 claims
- Hydrochlorothiazide86 claims
- Losartan Potassium72 claims
- Metoprolol Succinate56 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.
Greg Donald Ewert among 7,238 internal medicine physician records in Illinois
Greg Donald Ewert, M.D. is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 61% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated1986 · median 2003 among the 3,580 with a school on file
- Record last updated2026 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2,867 internal medicine physician records list a practice address in Chicago
They are 2,867 of the 63,379 NPPES records with a practice address in Chicago, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Chicago → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Angelo Costas, M.D.Chicago, IL 606041104874791
- Steven Deangeles, MDChicago, IL 606041467438630
- Ami Desai, M.D.Chicago, IL 606041710097795
- Louis Hiotis, M.D.Chicago, IL 606041710980339
- Elaine Leboff-Ries, M.D.Chicago, IL 606041013965771
- Dominic Leung, MDChicago, IL 606041144230335
Common questions
What is Greg Donald Ewert, M.D.'s NPI number?
Greg Donald Ewert, M.D.'s National Provider Identifier (NPI) is 1376591974, issued on May 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Greg Donald Ewert, M.D. located?
The NPPES record lists a practice address at 200 S Michigan Ave, Chicago, IL, 60604. Phone: (312) 922-3815. Providers update this record themselves, so call before visiting.
How can I verify Greg Donald Ewert, M.D.'s license?
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 Greg Donald Ewert, M.D. prescribe under Medicare Part D?
In 2024, Greg Donald Ewert, M.D. had 1,559 Medicare Part D claims for 136 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.