Dr. Mark R. Johnson, M.D.
Nephrology (Kidney) (Nephrology Physician)
- Medicare participating
At a glance
- Medical school
- New York University School of Medicine (2003)
- Years since graduation
- 23
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 592
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
- 2003Medical school: New York University School of Medicine
- 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
-
Nephrology Physician primary
NJ license 25MA08685600 -
Internal Medicine Physician
NJ license 25MA08685600
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Morristown Medical Center Morristown, NJ
- Overlook Medical Center Summit, NJ
- Chilton Medical Center Pompton Plains, NJ
- Newton Medical Center Newton, NJ
- Ahs Hospital Corp Hackettstown, NJ
Medical groups
- Practice Associates Medical Group (1,408 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
- 592
- Services billed
- 1,945
- Patients’ average age
- 78
| Service | Times | Patients |
|---|---|---|
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 797 | 293 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 590 | 309 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 246 | 232 |
| Established patient office or other outpatient visit, 20-29 minutes | 137 | 75 |
| New patient office or other outpatient visit, 45-59 minutes | 36 | 36 |
| Hemodialysis procedure with physician evaluation | 21 | 17 |
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 |
|---|---|
| Hydrochlorothiazide Other prescribers in Morristown, NJ | 46 |
| Amlodipine Besylate Other prescribers in Morristown, NJ | 37 |
| Tamsulosin Hcl Other prescribers in Morristown, NJ | 34 |
| Calcitriol Other prescribers in Morristown, NJ | 21 |
| Losartan Potassium Other prescribers in Morristown, NJ | 20 |
| Torsemide Other prescribers in Morristown, NJ | 17 |
| Lisinopril Other prescribers in Morristown, NJ | 16 |
| Farxiga (dapagliflozin propanediol) Other prescribers in Morristown, NJ | 14 |
| Kerendia (finerenone) Other prescribers in Morristown, NJ | 12 |
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, 4 companies reported 4 payments worth $184 in total to this clinician.
| Bayer HealthCare Pharmaceuticals Inc. | $127 |
|---|---|
| Tandem Diabetes Care, Inc. | $28.68 |
| Janssen Biotech, Inc. | $15.19 |
| Lilly USA, LLC | $13.78 |
| Food and Beverage | $184 |
|---|
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.