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

Mark D. Horneffer, MD

Individual provider Internal Medicine Physician · NPI 1710928965

Mark D. Horneffer, MD practises Internal Medicine in Wauwatosa, Wisconsin. Graduated from University of Michigan Medical School in 1990, 36 years ago. Practices with Columbia St Marys Hospital Milwaukee Inc, a 314-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Wisconsin.

Years since qualifying
36
Trained at
University of Michigan Medical School
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

10950 W Capitol Dr
Wauwatosa, WI 53222-1110 Not confirmed with CMS for 14 years — call before visiting
Phone: (414) 464-4460
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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 34632 (WI)

Record details

NPI number1710928965
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 9, 2006
Last updated in NPPESJune 12, 2012

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF MICHIGAN MEDICAL SCHOOL
Graduated 1990 (36 years in practice)
Group practice Columbia St Marys Hospital Milwaukee Inc — 314 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 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 patients169
Services billed 655 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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. Those with a page here are linked.

Colleagues at Columbia St Marys Hospital Milwaukee Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 314 clinicians in the practice; 12 are shown here.

Other providers in Wauwatosa