Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mervyn J. Weis, MD

Individual provider Internal Medicine Physician · NPI 1043212954

Mervyn J. Weis, MD is an Internal Medicine Physician in Chicago, Illinois. Licensed in Illinois. Registered with an NPI since 2005.

Licensed in
IL
In the registry since
2005
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

4640 N Marine Dr Ste 6100C
Chicago, IL 60640-5719
Phone: (773) 769-4411
Fax: (773) 769-5140
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X (IL)
Internal Medicine Physician Taxonomy 207R00000X (IL)

Record details

NPI number1043212954
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 11, 2005
Last updated in NPPESJuly 13, 2026

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