Dr. Mark R. Johnson, MD
- Medicare services, 2024
- 1,922
- Medicare patients, 2024
- 592
- Part D claims, 2024
- 327
- Hospital affiliations
- 5
- Industry payments
- $1,975
- Practice address
- 100 Madison Ave, Morristown, NJ 07962
- Practice phone
- Call (973) 971-5450
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Mark R. Johnson is a nephrologist in Morristown, New Jersey
Dr. Johnson practices at Morristown Medical Center in Morristown, New Jersey, part of Atlantic Health System.
Dr. Johnson's NPI, 1578670931, was assigned on August 23, 2006. Dr. Johnson graduated from New York University School of Medicine in 2003. Dr. Johnson holds New Jersey license 25MA08685600.
- NPI
- 1578670931NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1658376454
- NPI enumeration date
- August 23, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (973) 971-5450
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 49
- Medical school graduation
- 2003
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark R. Johnson practices at Morristown Medical Center in Morristown, New Jersey
Dr. Johnson's primary practice is Morristown Medical Center, at 100 Madison Ave, Morristown, NJ 07962 in Morris County. The practice phone is (973) 971-5450.
- Morristown Medical Center100 Madison Ave, Morristown, NJ 07962 · Morris CountyPhone(973) 971-5450
Source: Dmand AI Affiliation Data
Dr. Mark R. Johnson is affiliated with 5 sites of care and 1 medical group
Dr. Johnson's primary practice is Morristown Medical Center in Morristown, New Jersey, part of Atlantic Health System. Dr. Johnson is also affiliated with Overlook Medical Center. The medical group on file is Atlantic Medical Group. Dmand AI also links Dr. Johnson to 3 more hospitals, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark R. Johnson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johnson practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Morristown Medical Center | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Atlantic Health System and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Mark R. Johnson is one of 399 nephrologists in New Jersey
Nephrology is Dr. Johnson's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Johnson is licensed in New Jersey.
Specialties and state licenses
- Nephrology, New JerseyPrimary
Nephrologists near Dr. Johnson
Counts of nephrologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark R. Johnson billed Medicare for 1,922 services in 2024
CMS data shows 1,922 Medicare services from Dr. Johnson across 5 procedure codes in 2024, for 592 Medicare patients. Medicare paid $179,651 for them.
Dr. Johnson's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,8062024: 1,9226%
- Tests and treatments
- 2023: 212024: 0100%
Where Dr. Johnson's Medicare services took place, 2024
- In an office22512%
- In a facility1,69788%
Dr. Johnson compared with the New Jersey median for nephrologists, 2024
- Dr. Johnson
- New Jersey median
- Medicare services
- 1,922vs 1,38239% above
- Medicare patients
- 592vs 37160% above
- Part D claims
- 217vs 94577% below
Medians across 397 nephrologists in New Jersey with Dmand AI profiles that report each measure.
Dr. Johnson's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark R. Johnson treated 592 Medicare patients in 2024, average age 78
CMS counts 592 Medicare patients who saw Dr. Johnson in 2024. The largest group is 75 to 84, with 240 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 16% are also on Medicaid. Their average risk score is 3.02, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Johnson's median patient age at 72, with 46% women.
Dr. Johnson's Medicare patients by age, 2024
Dr. Johnson's Medicare patients by sex, 2024
- Women25944%
- Men33356%
Chronic conditions among Dr. Johnson's Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease67%
- Diabetes62%
- Heart failure61%
- Arthritis50%
- Atrial fibrillation47%
Share of Medicare patients with each condition. A patient can have several.
Dr. Johnson's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women46%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark R. Johnson wrote 327 Medicare Part D claims in 2024
In 2024, Dr. Johnson wrote 327 Medicare Part D claims for 81 patients. 87% of them were for generic drugs. CMS names the drug for 217 of them, across 9 drugs with 11 or more claims each, at $38,679 in total drug cost. In 2023, CMS named 111 claims across 6 drugs.
Dr. Johnson's Part D claims by kind of drug, 2024
- Generic283 claims87%
- Brand-name44 claims13%
Dr. Johnson's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1112024: 21795%
Drugs named by CMS: 9 in 2024, 6 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Mark R. Johnson offers telehealth to Medicare patients
Dr. Johnson accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Johnson as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Mark R. Johnson received $1,975 in industry payments from 2016 to 2025
CMS Open Payments shows 115 general payments to Dr. Johnson from 18 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $460.
General payments to Dr. Johnson by program year, 2016 to 2025
Companies that paid Dr. Johnson the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark R. Johnson graduated from New York University School of Medicine
Dr. Johnson graduated from New York University School of Medicine in 2003.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark R. Johnson's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Mark R. Johnson
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mark R. Johnson's NPI number?
Dr. Mark R. Johnson's NPI number is 1578670931. It was assigned on August 23, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark R. Johnson?
Dr. Mark R. Johnson is a nephrologist in Morristown, New Jersey. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Mark R. Johnson practice?
Dr. Johnson practices at 100 Madison Ave, Morristown, NJ 07962. Dr. Johnson's primary practice is Morristown Medical Center in Morristown, New Jersey, part of Atlantic Health System. Dmand AI also links Dr. Johnson to 3 hospitals.
What is Dr. Mark R. Johnson's office phone number?
The practice phone on file for Dr. Johnson is (973) 971-5450.
What is Dr. Mark R. Johnson's medical license number?
Dr. Johnson holds New Jersey license 25MA08685600.
Which hospitals is Dr. Mark R. Johnson affiliated with?
Dr. Johnson practices at Morristown Medical Center in Morristown, New Jersey. Dr. Johnson is also affiliated with Overlook Medical Center. Dmand AI links Dr. Johnson to 3 more hospitals.
What medical group is Dr. Mark R. Johnson part of?
Dr. Johnson is linked to Atlantic Medical Group.
Does Dr. Mark R. Johnson accept Medicare?
Yes. CMS data shows Dr. Johnson billed Medicare for 1,922 services in 2024, and Dr. Johnson accepts Medicare assignment.
Does Dr. Mark R. Johnson offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Johnson as offering telehealth services.
How many Medicare patients does Dr. Mark R. Johnson see?
CMS counts 592 Medicare patients who saw Dr. Johnson in 2024, with an average age of 78.
Show 5 more questionsShow fewer questions
What services does Dr. Mark R. Johnson bill to Medicare?
In 2024, Dr. Johnson's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99232) and hospital inpatient care (99223).
Where did Dr. Mark R. Johnson go to medical school?
Dr. Johnson graduated from New York University School of Medicine in 2003.
What drugs does Dr. Mark R. Johnson prescribe most?
In 2024 Medicare Part D data, Dr. Johnson's most prescribed drugs by claims were Hydrochlorothiazide, Amlodipine Besylate and Tamsulosin HCl.
Has Dr. Mark R. Johnson received payments from drug or device companies?
CMS Open Payments shows $1,975 in general payments to Dr. Johnson from 18 companies from 2016 to 2025. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Mark R. Johnson been practicing?
Dr. Johnson graduated from medical school in 2003, 23 years ago.
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