Dr. William C. Armstrong, MD
Cardiology (Cardiovascular Disease Physician)
- Medicare participating
At a glance
- Medical school
- University of Mississippi School of Medicine (2014)
- Years since graduation
- 12
- In the NPI registry since
- 2014
- Medicare patients seen, 2024
- 1,615
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. What an NPI is
Education and training
- 2014Medical school: University of Mississippi School of Medicine
- 2014Registered with an NPI (national billing number; not a license date)
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
-
Cardiovascular Disease Physician primary
TN license 53949 - Student in an Organized Health Care Education/Training Program
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Memorial Healthcare System, Inc Chattanooga, TN
- Erlanger Medical Center Chattanooga, TN
- Commonspirit-Memorial Hospital-North Georgia Ringgold, GA
Medical groups
- Memorial Health Care System Inc. (56 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
- 1,615
- Services billed
- 3,167
- Patients’ average age
- 76
| Service | Times | Patients |
|---|---|---|
| Ultrasound of heart with color-depicted blood flow, rate, direction and valve function | 909 | 904 |
| Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician | 294 | 294 |
| Established patient office or other outpatient visit, 30-39 minutes | 288 | 212 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | 276 | 243 |
| Nuclear medicine studies of heart muscle at rest and with stress and spect | 223 | 223 |
| Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician | 165 | 165 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 163 | 73 |
| Ct scan of blood vessels of chest with contrast | 119 | 119 |
| New patient office or other outpatient visit, 45-59 minutes | 68 | 68 |
| Ultrasound of both sides of head and neck blood flow | 63 | 63 |
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, 6 companies reported 8 payments worth $204 in total to this clinician.
| AstraZeneca Pharmaceuticals LP | $112 |
|---|---|
| Alnylam Pharmaceuticals Inc. | $21.16 |
| Boston Scientific Corporation | $18.87 |
| Chiesi USA, Inc. | $18.74 |
| Heartflow, Inc. | $18.02 |
| E.r. Squibb & Sons, L.l.c. | $15.27 |
| Food and Beverage | $204 |
|---|
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.