Dr. Michael T. Johnston, M.D.
Internal Medicine (Internal Medicine Physician)
- Medicare participating
At a glance
- Medical school
- University of Texas Medical School at San Antonio (1995)
- Years since graduation
- 31
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 469
Licensed in Texas since 1996, according to the Texas Medical Board. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
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
- 1995Medical school: University of Texas Medical School at San Antonio
- 2006Registered 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
-
Internal Medicine Physician primary
TX license K0498 (first issued 1996; active)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Baylor University Medical Center Dallas, TX
- Baylor Scott & White Medical Center Plano Plano, TX
- Texas Health Presbyterian Hospital Dallas Dallas, TX
- Baylor Scott and White Medical Center Lake Pointe Rowlett, TX
- Methodist Dallas Medical Center Dallas, TX
Medical groups
- Healthtexas Provider Network (2,697 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
- 469
- Services billed
- 5,788
- Patients’ average age
- 75
| Service | Times | Patients |
|---|---|---|
| Injection, denosumab, 1 mg | 2,460 | 23 |
| Insertion of needle into vein for collection of blood sample | 633 | 430 |
| Established patient office or other outpatient visit, 30-39 minutes | 521 | 302 |
| Established patient office or other outpatient visit, 20-29 minutes | 442 | 392 |
| Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 353 | 353 |
| Administration of influenza virus vaccine | 104 | 104 |
| Influenza vaccine split virus, preservative free | 77 | 77 |
| Injection of drug or substance under skin or into muscle | 47 | 26 |
| X-ray of chest, 2 views | 33 | 30 |
| Administration of pneumococcal vaccine | 32 | 32 |
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
| Drug | Prescriptions |
|---|---|
| Atorvastatin Calcium Other prescribers in Dallas, TX | 674 |
| Rosuvastatin Calcium Other prescribers in Dallas, TX | 653 |
| Amlodipine Besylate Other prescribers in Dallas, TX | 500 |
| Lisinopril Other prescribers in Dallas, TX | 328 |
| Levothyroxine Sodium Other prescribers in Dallas, TX | 317 |
| Simvastatin Other prescribers in Dallas, TX | 282 |
| Lisinopril-Hydrochlorothiazide (lisinopril/hydrochlorothiazide) Other prescribers in Dallas, TX | 262 |
| Escitalopram Oxalate Other prescribers in Dallas, TX | 251 |
| Pantoprazole Sodium Other prescribers in Dallas, TX | 242 |
| Losartan Potassium Other prescribers in Dallas, TX | 239 |
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, 3 companies reported 9 payments worth $165 in total to this clinician.
| Novo Nordisk Inc | $105 |
|---|---|
| Boston Scientific Corporation | $43.12 |
| Amgen Inc. | $17.35 |
| Food and Beverage | $165 |
|---|
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.