Mervyn J. Weis, MD
Gastroenterology Physician · Chicago, IL
Mervyn J. Weis, MD is a gastroenterology physician with a practice address in Chicago, Illinois, and NPI 1043212954, issued on Aug 11, 2005. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mervyn J. Weis
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- Practice location
- 4640 N Marine Dr, Chicago, IL 60640
- Phone
- (773) 769-4411
- Enumerated
- Aug 11, 2005
- Record last updated
- Jul 13, 2026
- Fax
- (773) 769-5140
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 887 in Illinois → Look up another NPI →
Also registered at 4640 N Marine Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maribe Bangayan, MDPulmonary Disease Physician1982602629
- Aleksandra Ivanovic, MDInternal Medicine Physician1477546711
- Muhammad Saudye, M.D.Cardiovascular Disease Physician1013918804
Verify Mervyn J. Weis 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
98% fewer Medicare Part D claims than the average gastroenterology physician in 2024
14 Medicare Part D claims, against an average of 811 among the 16,445 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.
Mervyn J. Weis among 887 gastroenterology physician records in Illinois
Mervyn J. Weis, MD is one of 887 gastroenterology physician records with a practice address in Illinois. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 85% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2026 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Illinois
There are 887 gastroenterology physician records in Illinois.
All 887 in Illinois → Every provider in Chicago → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Malek Ayoub, MDChicago, IL 606371609510981
- Richard Bone, M.D.Chicago, IL 606431407887938
- Emaree Cobb, MDChicago, IL 606371407484587
- Nathaniel Cohen, MDChicago, IL 606371023624988
- Darrien Gaston, M.D.Chicago, IL 606431023234143
- Alvin George, MDChicago, IL 606371023633138
- Ophir Gilad, MDChicago, IL 606371114715596
- David HakimianChicago, IL 606371376208744
Common questions
What is Mervyn J. Weis, MD's NPI number?
Mervyn J. Weis, MD's National Provider Identifier (NPI) is 1043212954, issued on Aug 11, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mervyn J. Weis, MD located?
The NPPES record lists a practice address at 4640 N Marine Dr, Chicago, IL, 60640. Phone: (773) 769-4411. Providers update this record themselves, so call before visiting.
How can I verify Mervyn J. Weis, MD'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 Mervyn J. Weis, MD prescribe under Medicare Part D?
In 2024, Mervyn J. Weis, MD had 14 Medicare Part D claims; the average among gastroenterology physician prescribers was 811. 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.