Doctor profile · Federal record
Dr. Jeffrey Mark, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Turlock, CA
- NPI 1487603155
- Accepts Medicare
- MIPS 20.1 / 100 · 2023
- 34 yrs in practice
- Male
- No sanctions
Practice & contact
- Primary practice
-
2101 Geer RD, Suite #118
Turlock, CA 953822454
(209) 669-5000
fax (209) 669-5001
Credentials & registration
- NPI registered
- May 2006 — 20 yrs on file
- Profile last updated
- July 8, 2007
- Year of graduation
- 1992 — 34 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- California #G83524
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1487603155. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,343
Distinct HCPCS
6
Medicare allowed
$195,311
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 1,053 | 304 | $137 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 113 | 113 | $178 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 78 | 78 | $183 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 48 | 48 | $93 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 36 | 36 | $262 | |
45378 |
Diagnostic exam of large bowel using a flexible endoscope | 15 | 14 | $178 |
In context: peer comparison
Among 2 peers in Turlock Gastroenterology Physician, average services per provider: 158. This provider delivers 8.5× the peer median.Open Payments
Industry payments received
All-time total
$348
Transactions
12
Manufacturers
5
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Madrigal Pharmaceuticals | 2 | $144.75 | |
| Abbvie INC. | 6 | $111.60 | |
| Pfizer INC. | 2 | $50.43 | |
| Janssen Biotech, INC. | 1 | $21.96 | |
| Merck Sharp & Dohme LLC | 1 | $18.89 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
353
Patients
161
Total drug cost
$45,044
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Omeprazole | Generic | 79 | 32 | $1,050 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,Mag Sulfates) | Brand | 43 | 43 | $3,345 |
| Pantoprazole Sodium | Generic | 33 | 12 | $366 |
| Famotidine | Generic | 32 | 17 | $509 |
| Sutab (Sod Sulf/Pot Chloride/Mag Sulf) | Brand | 29 | 29 | $4,875 |
| Linzess (Linaclotide) | Brand | 28 | 0 | $19,357 |
| Sucralfate | Generic | 28 | 16 | $2,423 |
| Hydrocortisone | Generic | 21 | 12 | $670 |
| Lansoprazole | Generic | 16 | 0 | $437 |
| Dexlansoprazole Dr (Dexlansoprazole) | Brand | 11 | 0 | $6,652 |
Frequently asked questions
What is Dr. Jeffrey Mark's medical specialty?
Dr. Jeffrey Mark practices Gastroenterology Physician in Turlock, CA.
Where does Dr. Jeffrey Mark practice?
Dr. Jeffrey Mark practices at 2101 Geer RD, Turlock, CA 953822454. Office phone: 2096695000.
What is Dr. Jeffrey Mark's NPI?
Dr. Jeffrey Mark's National Provider Identifier (NPI) is 1487603155, issued by NPPES.
Does Dr. Jeffrey Mark accept Medicare assignment?
Yes. Dr. Jeffrey Mark accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Jeffrey Mark commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); New patient office or other outpatient visit (HCPCS 99204); Biopsy of large bowel using a flexible endoscope (HCPCS 45380). Source: CMS Medicare Physician & Other Practitioners file.