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

Ralph R Weichselbaum, MD

Individual provider Radiation Oncology Physician · NPI 1578510749

Ralph R Weichselbaum, MD is a Radiation Oncology Physician in Chicago, Illinois. Licensed in Massachusetts. Registered with an NPI since 2006.

Licensed in
MA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

5758 S Maryland Ave MC9006
Chicago, IL 60637-1426
Phone: (773) 702-0817
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence 34518 (MA)

Record details

NPI number1578510749
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 31, 2006
Last updated in NPPESJuly 13, 2026

Other providers in Chicago