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

Tony S Chang, MD

Individual provider Internal Medicine Physician · NPI 1831166990

Tony S Chang, MD is an Internal Medicine in Madison, Wisconsin. Graduated from University of Wisconsin School of Medicine in 1995, 31 years ago. Practices with University of Wisconsin Medical Foundation Inc, a 2,536-clinician group and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
31
Trained at
University of Wisconsin School of Medicine
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

20 S Park St Ste 405B
Madison, WI 53715
Phone: (608) 287-2440
Fax: (608) 287-2438
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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 42048 (WI)

Record details

NPI number1831166990
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 7, 2006
Last updated in NPPESJanuary 4, 2021
Certification dateJanuary 4, 2021

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF WISCONSIN SCHOOL OF MEDICINE
Graduated 1995 (31 years in practice)
Group practice University Of Wisconsin Medical Foundation Inc — 2536 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations17 on file with Medicare

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