Doctor profile · Federal record
Dr. Mark Johnson, M.D.
Nephrology Physician (CMS: Nephrology) · Internal Medicine Physician · Morristown, NJ
- NPI 1578670931
- Accepts Medicare
- 23 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
100 Madison Ave
Morristown, NJ 079606136
(973) 971-7165
fax (973) 290-7521 - Mailing address
-
Po Box 23831
Newark, NJ 071890831
Credentials & registration
- NPI registered
- August 2006 — 20 yrs on file
- Profile last updated
- January 7, 2010
- Year of graduation
- 2003 — 23 yrs since
- Specialty taxonomy
- 207RN0300X — NUCC code
- State license (1)
- New Jersey #25MA08685600
- Medicaid
- NY #02784701
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1578670931. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,827
Distinct HCPCS
6
Medicare allowed
$219,193
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 797 | 293 | $128 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 590 | 309 | $85 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 246 | 232 | $186 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 137 | 75 | $98 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 36 | 36 | $183 | |
90935 |
Hemodialysis procedure with physician evaluation | 21 | 17 | $76 |
In context: peer comparison
Among 5 peers in Morristown Nephrology Physician, average services per provider: 185. This provider delivers 9.9× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
111
Patients
12
Total drug cost
$1,159
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Losartan Potassium | Generic | 25 | 12 | $383 |
| Amlodipine Besylate | Generic | 23 | 0 | $184 |
| Hydrochlorothiazide | Generic | 21 | 0 | $112 |
| Furosemide | Generic | 18 | 0 | $75 |
| Calcitriol | Generic | 13 | 0 | $152 |
| Torsemide | Generic | 11 | 0 | $253 |
Frequently asked questions
What is Dr. Mark Johnson's medical specialty?
Dr. Mark Johnson practices Nephrology Physician in Morristown, NJ.
Where does Dr. Mark Johnson practice?
Dr. Mark Johnson practices at 100 Madison Ave, Morristown, NJ 079606136. Office phone: 9739717165.
What is Dr. Mark Johnson's NPI?
Dr. Mark Johnson's National Provider Identifier (NPI) is 1578670931, issued by NPPES.
Does Dr. Mark Johnson accept Medicare assignment?
Yes. Dr. Mark Johnson accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mark Johnson commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Initial hospital care with moderate level of medical decision making (HCPCS 99223). Source: CMS Medicare Physician & Other Practitioners file.