Gregory Clarke, M.D.
Internal Medicine Physician · Chicago, IL
Gregory Clarke, M.D. is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1609996420, issued on Mar 29, 2007. Check the license (Illinois 036-071641, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Gregory Clarke
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036-071641 IL
Self-reported in NPPES; status is on the state search - Practice location
- 333 N Michigan Ave, Chicago, IL 60601
- Phone
- (312) 236-3175
- Enumerated
- Mar 29, 2007
- Record last updated
- Apr 26, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (312) 263-3177
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 333 N Michigan Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- James Anderson, PHDClinical Psychologist1295814721
- Kelly Balk, PSY.D., L.P.Clinical Psychologist1043605827
- Tyler BashamPsychologist1548996275
- Lindsay Birchfield, RDRegistered Dietitian1093252835
- Aviva Cahn, LCSWClinical Social Worker1003108903
- Darian CarterProfessional Counselor1457823221
Verify Gregory Clarke 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 036-071641Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average internal medicine physician in 2024
118 Medicare Part D claims for 15 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Amlodipine Besylate15 claims
- Atorvastatin Calcium12 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.
Gregory Clarke among 7,238 internal medicine physician records in Illinois
Gregory Clarke, 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 2007, is newer than 39% of them.
- NPI issued2007 · 39% of these records are older, 55% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2010 · 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
- James Barrett, M.D.Chicago, IL 606011407863210
- Anne-Sophie Kim, MDChicago, IL 606011285195396
- Robert Noven, MDChicago, IL 606011326066929
- Linda O'Bannon, MDChicago, IL 606011932501533
- Neema Patel, DOChicago, IL 606011871813188
- Marianne Pavach, M.D.Chicago, IL 606011639205594
- Theri Raby, M.D.Chicago, IL 606011144250838
- Sydney Ross-Davis, M.D.Chicago, IL 606011801072558
Common questions
What is Gregory Clarke, M.D.'s NPI number?
Gregory Clarke, M.D.'s National Provider Identifier (NPI) is 1609996420, issued on Mar 29, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Clarke, M.D. located?
The NPPES record lists a practice address at 333 N Michigan Ave, Chicago, IL, 60601. Phone: (312) 236-3175. Providers update this record themselves, so call before visiting.
How can I verify Gregory Clarke, M.D.'s license?
NPPES lists Illinois license number 036-071641, 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 Gregory Clarke, M.D. prescribe under Medicare Part D?
In 2024, Gregory Clarke, M.D. had 118 Medicare Part D claims for 15 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.