Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

James B Nelson, MD

Individual provider Gastroenterology Physician · NPI 1245291061

James B Nelson, MD practises Gastroenterology in Milwaukee, Wisconsin. Graduated from Medical College of Wisconsin in 1983, 43 years ago. Practices with Froedtert Andthe Medical College of Wisconsin Community Physicians Inc, a 1,255-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
43
Trained at
Medical College of Wisconsin
Licensed in
WI
In the registry since
2006
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

9200 W Wisconsin Ave
Milwaukee, WI 53226-3522
Phone: (414) 805-3310
Fax: (414) 805-3885
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 7901 S 6th St, Oak Creek, WI 53154-2010 — (414) 346-8000

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 37286 (WI)

Record details

NPI number1245291061
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 31, 2006
Last updated in NPPESJanuary 31, 2023
Certification dateJanuary 31, 2023

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolMEDICAL COLLEGE OF WISCONSIN
Graduated 1983 (43 years in practice)
Group practice Froedtert Andthe Medical College Of Wisconsin Community Physicians Inc — 1255 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 1–10 times
Upper gastrointestinal (GI) endoscopy for acid reflux 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients12
Services billed 19 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Froedtert Andthe Medical College of Wisconsin Community Physicians Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1255 clinicians in the practice; 12 are shown here.

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