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

James J Greenberg, MD

Individual provider Surgery Physician · NPI 1164412136

James J Greenberg, MD is a General Surgery in Lake Geneva, Wisconsin. Graduated from University of Missouri, Kansas City, School of Medicine in 1991, 35 years ago. Practices with Mercy Health System Corporation, a 751-clinician group and accepts Medicare assignment. Licensed in Illinois and Wisconsin.

Years since qualifying
35
Trained at
University of Missouri, Kansas City, School of Medicine
Licensed in
IL, WI
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.

See every abbreviation used in this directory →

Practice location Address checks out

N2950 State Road 67
Lake Geneva, WI 53147-2655
Phone: (262) 245-0535
Show map & directions

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

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence 53948 (WI)
Surgery Physician Taxonomy 208600000X · Licence 036-087181 (IL)

Record details

NPI number1164412136
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 21, 2005
Last updated in NPPESSeptember 29, 2011
Mailing addressN2950 State Road 67, Lake Geneva, WI 53147-2655

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGENERAL SURGERY
Medical schoolUNIVERSITY OF MISSOURI, KANSAS CITY, SCHOOL OF MEDICINE
Graduated 1991 (35 years in practice)
Group practice Mercy Health System Corporation — 751 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Lake Geneva