Dr. Mark W. Erhard, MD
Interventional Cardiology (Interventional Cardiology Physician)
1001 E Superior St Ste 201
Duluth, MN 55802
Who else practices at this address →
St. Louis County includes primary care (17% of residents) and dental (35% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- University of South Florida College of Medicine (1986)
- Years since graduation
- 40
- In the NPI registry since
- 2005
- Medicare patients seen, 2024
- 732
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 1986Medical school: University of South Florida College of Medicine
- 2005Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Interventional Cardiology Physician primary
MN license 32857
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- St Lukes Hospital Duluth, MN
- Range Regional Health Services Hibbing, MN
- Community Memorial Hospital Cloquet, MN
- Aspirus Ironwood Hospital Ironwood, MI
- Aspirus Lake View Hospital Two Harbors, MN
Medical groups
- St. Luke's Hospital of Duluth (405 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 732
- Services billed
- 1,143
- Patients’ average age
- 74
| Service | Times | Patients |
|---|---|---|
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 574 | 504 |
| Ultrasound of heart with color-depicted blood flow, rate, direction and valve function | 157 | 155 |
| Established patient office or other outpatient visit, 30-39 minutes | 136 | 126 |
| Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician | 31 | 31 |
| New patient office or other outpatient visit, 45-59 minutes | 30 | 30 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 29 | 29 |
| Nuclear medicine studies of heart muscle at rest and with stress and spect | 25 | 25 |
| Ultrasound of heart blood flow, valves and chambers, follow-up | 20 | 19 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 20 | 16 |
| Ultrasound of heart with probe in esophagus, with report | 15 | 15 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 2 companies reported 2 payments worth $135 in total to this clinician.
| Abbott Laboratories | $97.41 |
|---|---|
| Boston Scientific Corporation | $38.03 |
| Food and Beverage | $135 |
|---|
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.