Quick answers
- Which hospitals does Mark R. Johnson work at?
- Medicare's official clinician data lists Mark R. Johnson at 5 hospitals: Ahs Hospital Corp, Chilton Medical Center, Morristown Medical Center, Newton Medical Center and Overlook Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark R. Johnson see patients?
- Medicare's clinician data lists 1 practice location in Morristown, NJ. Call before your visit to confirm the address.
- What is Mark R. Johnson's specialty?
- Medicare lists Nephrology as the primary specialty, and also Internal Medicine.
- Does Mark R. Johnson accept Medicare assignment?
- Yes. Medicare's clinician data says Mark R. Johnson accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Mark R. Johnson offer telehealth?
- Medicare's clinician data says Mark R. Johnson offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark R. Johnson?
- (973) 971-5596, as listed in official Medicare / NPI Registry data.
- What is Mark R. Johnson's NPI number?
- 1578670931. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark R. Johnson works
Medicare's Facility Affiliation Data lists Mark R. Johnson at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ahs Hospital CorpHackettstown, NJ · Acute Care Hospital · CCN 310115
- Chilton Medical CenterPompton Plains, NJ · Acute Care Hospital · CCN 310017
- Morristown Medical CenterMorristown, NJ · Acute Care Hospital · CCN 310015
- Newton Medical CenterNewton, NJ · Acute Care Hospital · CCN 310028
- Overlook Medical CenterSummit, NJ · Acute Care Hospital · CCN 310051
Practice locations
Addresses where Mark R. Johnson is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 Madison AveMorristown, NJ 07960 (973) 971‑5596
Group practices
Medicare enrollment lists Mark R. Johnson as a member of this group (CMS data updated 2026-10-02).
- Practice Associates Medical Group1,408 clinicians in the group
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in Morristown
Clinicians with the same Medicare primary specialty in Morristown, NJ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | New York University School Of Medicine |
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1578670931 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians