Doctor profile · Federal record
Dr. Mark Johnson, M.D.
Gastroenterology Physician · Chula Vista, CA
- NPI 1861421372
- 20 yrs on file
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
480 4Th Ave, Suite 506
Chula Vista, CA 919104410
(619) 585-0313
fax (619) 585-0037 - Mailing address
-
65 Catspaw Cpe
Coronado, CA 921183221
Credentials & registration
- NPI registered
- June 2006 — 20 yrs on file
- Profile last updated
- October 4, 2007
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- California #G28163
- Medicaid
- CA #00G281630
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1861421372. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,086
Distinct HCPCS
10
Medicare allowed
$166,302
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 428 | 119 | $123 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 127 | 116 | $179 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 122 | 77 | $190 | |
99205 |
New patient office or other outpatient visit, 60-74 minutes | 84 | 84 | $234 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 79 | 77 | $121 | |
45378 |
Diagnostic exam of large bowel using a flexible endoscope | 60 | 58 | $167 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 60 | 53 | $135 | |
91200 |
Measurement of liver stiffness | 40 | 34 | $34 | |
99291 |
Critical care, first 30-74 minutes | 32 | 14 | $218 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 20 | 20 | $260 |
In context: peer comparison
Among 2 peers in Chula Vista Gastroenterology Physician, average services per provider: 70. This provider delivers 16× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
602
Patients
297
Total drug cost
$40,391
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Omeprazole | Generic | 160 | 66 | $4,847 |
| Peg 3350-Electrolyte (Sodium Chloride/Nahco3/Kcl/Peg) | Brand | 107 | 100 | $2,607 |
| Metoclopramide Hcl | Generic | 54 | 16 | $793 |
| Fluoxetine Hcl | Generic | 46 | 17 | $1,138 |
| Dicyclomine Hcl | Generic | 42 | 20 | $1,340 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,Mag Sulfates) | Brand | 40 | 36 | $3,255 |
| Pantoprazole Sodium | Generic | 39 | 15 | $958 |
| Sucralfate | Generic | 25 | 12 | $1,800 |
| Famotidine | Generic | 21 | 0 | $795 |
| Ondansetron Odt (Ondansetron) | Brand | 21 | 0 | $1,249 |
Frequently asked questions
What is Dr. Mark Johnson's medical specialty?
Dr. Mark Johnson practices Gastroenterology Physician in Chula Vista, CA.
Where does Dr. Mark Johnson practice?
Dr. Mark Johnson practices at 480 4Th Ave, Chula Vista, CA 919104410. Office phone: 6195850313.
What is Dr. Mark Johnson's NPI?
Dr. Mark Johnson's National Provider Identifier (NPI) is 1861421372, issued by NPPES.
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); Initial hospital care with moderate level of medical decision making (HCPCS 99223); Established patient office or other outpatient visit (HCPCS 99215). Source: CMS Medicare Physician & Other Practitioners file.