Mark Horneffer, MD
NPI 1710928965 · Internal Medicine Physician · Wauwatosa, WI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Horneffer, MD is a Internal Medicine Physician provider in Wauwatosa, WI (NPI 1710928965).
Provider details
- NPI number
- 1710928965
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 34632 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
554 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 292 | $91 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 126 | $122 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 81 | $131 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 41 | $64 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 14 | $47 |
Typical Medicare-allowed amounts for these services range $47–$131 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 127 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 452 | 119 |
| Losartan Potassium | 333 | 92 |
| Metoprolol Succinate | 321 | 83 |
| Amlodipine Besylate | 315 | 84 |
| Levothyroxine Sodium | 219 | 55 |
| Rosuvastatin Calcium | 209 | 61 |
| Metformin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-09
- Last updated
- 2012-06-12
Frequently asked questions
- What is Mark Horneffer's NPI number?
- Mark Horneffer's National Provider Identifier (NPI) is 1710928965, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Horneffer's specialty?
- Mark Horneffer is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Horneffer located?
- Mark Horneffer's practice location on file with NPPES is 10950 W Capitol Dr, Wauwatosa, WI 53222-1110.
- What is Mark Horneffer's phone number?
- The practice phone number listed in the NPPES registry for Mark Horneffer is (414) 464-4460.
- Does Mark Horneffer accept Medicare?
- Mark Horneffer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Horneffer's NPI active?
- Yes — Mark Horneffer's NPI (1710928965) is active in the NPPES registry as of the last update on 2012-06-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.