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

Individual provider Internal Medicine Physician · NPI 1891762852

Dr. Thomas A Johnson, MD is an Internal Medicine in Brookfield, Wisconsin. Graduated from University of Illinois College of Med (CHI/PEOR/ROCK/Chm-Urb) in 1976, 50 years ago. Practices with Ascension Medical Group-Southeast Wisconsin Inc, a 555-clinician group and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
50
Trained at
University of Illinois College of Med (CHI/PEOR/ROCK/Chm-Urb)
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

17000 W North Ave Ste 200E
Brookfield, WI 53005-4423
Phone: (262) 782-4270
Fax: (262) 784-9319
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 26997 (WI)

Record details

NPI number1891762852
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 8, 2006
Last updated in NPPESAugust 22, 2011
Mailing address17000 W North Ave, Suite 200e, Brookfield, WI 53005-4423

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF ILLINOIS COLLEGE OF MED (CHI/PEOR/ROCK/CHM-URB)
Graduated 1976 (50 years in practice)
Group practice Ascension Medical Group-Southeast Wisconsin Inc — 555 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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