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

Thomas Westfall, MD

Individual provider Hospitalist Physician · NPI 1558388355

Thomas Westfall, MD practises Internal Medicine in Madison, Wisconsin. Graduated from University of Wisconsin School of Medicine in 2003, 23 years ago. Practices with Meriter Hospital Inc, a 123-clinician group and accepts Medicare assignment. Licensed in Illinois and Wisconsin.

Years since qualifying
23
Trained at
University of Wisconsin School of Medicine
Licensed in
IL, WI
In the registry since
2006
Specialties on file
3
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

202 S Park St
Madison, WI 53715-1507
Phone: (608) 417-5659
Fax: (608) 417-5890
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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 54671-20 (WI)
Hospitalist Physician Taxonomy 208M00000X · Licence 54671-20 (WI)
Internal Medicine Physician Taxonomy 207R00000X · Licence 036-115763 (IL)

Record details

NPI number1558388355
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 16, 2006
Last updated in NPPESJune 13, 2026
Certification dateJune 13, 2026

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 2003 (23 years in practice)
Group practice Meriter Hospital Inc — 123 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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 patients44
Services billed 44 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Meriter Hospital Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 123 clinicians in the practice; 12 are shown here.

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