Mark D. Horneffer, MD
Internal Medicine Physician · Wauwatosa, WI
Mark D. Horneffer, MD is an internal medicine physician with a practice address in Wauwatosa, Wisconsin, and NPI 1710928965, issued on Jun 9, 2006. Check the license (Wisconsin 34632, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Mark D. Horneffer
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 34632 WI
Self-reported in NPPES; status is on the state search - Practice location
- 10950 W Capitol Dr, Wauwatosa, WI 53222
- Phone
- (414) 464-4460
- Enumerated
- Jun 9, 2006
- Record last updated
- Jun 12, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicaid ID
- 31941300 WI
- Medicare enrollment
- Enrolled (PECOS I20050725000295); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 1990
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Also registered at 10950 W Capitol Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Stephen Baker, M.D.Internal Medicine Physician1518931013
- Jane Hawes, MDInternal Medicine Physician1922049162
- Daniel Mui, MDInternal Medicine Physician1154363364
- Patricia Noonan, CNSClinical Nurse Specialist1487731782
- Tina Olander, M.D.Internal Medicine Physician1427164995
- Katherine Rowland, APNPNurse Practitioner1124290952
Verify Mark D. Horneffer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 34632Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.5 times the Medicare Part D claims of the average internal medicine physician in 2024
7,931 Medicare Part D claims for 459 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 278 claims were for opioids.
Most prescribed
- Atorvastatin Calcium452 claims
- Losartan Potassium333 claims
- Metoprolol Succinate321 claims
- Amlodipine Besylate315 claims
- Levothyroxine Sodium219 claims
- Rosuvastatin Calcium209 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 75.8 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Columbia St Marys Hospital Milwaukee IncWauwatosa, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark D. Horneffer among 2,078 internal medicine physician records in Wisconsin
Mark D. Horneffer, MD is one of 2,078 internal medicine physician records with a practice address in Wisconsin. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 46% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1990 · median 2002 among the 1,098 with a school on file
- Record last updated2012 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
45 internal medicine physician records list a practice address in Wauwatosa
They are 45 of the 1,787 NPPES records with a practice address in Wauwatosa, and 2,078 internal medicine physician records in Wisconsin.
All 2,078 in Wisconsin → Every provider in Wauwatosa → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Kalpana Ajjampore, MDWauwatosa, WI 532221518903665
- Stephen Baker, M.D.Wauwatosa, WI 532221518931013
- U Blaschke, MDWauwatosa, WI 532221437111762
- Sharon Doss, MDMilwaukee, WI 532221215966510
- Mohammad Fareed, MDWauwatosa, WI 532221841229044
- Alok Goyal, M.D.Milwaukee, WI 532221487634036
- Sunitha Gundamraj, M.D.Wauwatosa, WI 532221245269398
- Jane Hawes, MDWauwatosa, WI 532221922049162
Common questions
What is Mark D. Horneffer, MD's NPI number?
Mark D. Horneffer, MD's National Provider Identifier (NPI) is 1710928965, issued on Jun 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark D. Horneffer, MD located?
The NPPES record lists a practice address at 10950 W Capitol Dr, Wauwatosa, WI, 53222. Phone: (414) 464-4460. Providers update this record themselves, so call before visiting.
How can I verify Mark D. Horneffer, MD's license?
NPPES lists Wisconsin license number 34632, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark D. Horneffer, MD prescribe under Medicare Part D?
In 2024, Mark D. Horneffer, MD had 7,931 Medicare Part D claims for 459 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mark D. Horneffer, MD's MIPS final score?
The 2023 MIPS final score is 75.8 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.