Dr. Mark H. Kogan, M.D.
Gastroenterology (Gastroenterology Physician)
2089 Vale Rd, Suite 33
San Pablo, CA 94806
Who else practices at this address →
Contra Costa County includes mental health (19% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- Northwestern University Feinberg Medical School (1980)
- Years since graduation
- 46
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 407
Licensed in California since 1987, according to the Medical Board of California. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 1980Medical school: Northwestern University Feinberg Medical School
- 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Gastroenterology Physician primary
CA license G60809 (first issued 1987; current)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Alta Bates Summit Medical Center Oakland, CA
- Alta Bates Summit Medical Center - Alta Bates Camp Berkeley, CA
- Contra Costa Regional Medical Center Martinez, CA
- Ridgecrest Regional Hospital Ridgecrest, CA
Medical groups
- Sutter Bay Medical Foundation (3,829 clinicians)
- Genesis Healthcare PArtners PC (228 clinicians)
- Ridgecrest Regional Hospital (95 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 407
- Services billed
- 2,627
- Patients’ average age
- 73
| Service | Times | Patients |
|---|---|---|
| Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month | 658 | 51 |
| Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 387 | 52 |
| Established patient office or other outpatient visit, 30-39 minutes | 161 | 107 |
| Established patient office or other outpatient visit, 20-29 minutes | 132 | 108 |
| New patient office or other outpatient visit, 30-44 minutes | 83 | 83 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 70 | 68 |
| Biopsy of large bowel using a flexible endoscope | 64 | 64 |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 61 | 61 |
| New patient office or other outpatient visit, 45-59 minutes | 55 | 55 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 35 | 20 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Omeprazole Other prescribers in San PAblo, CA | 204 |
| Pantoprazole Sodium Other prescribers in San PAblo, CA | 115 |
| Dicyclomine Hcl Other prescribers in San PAblo, CA | 64 |
| Sutab (sod sulf/pot chloride/mag sulf) | 62 |
| Gavilyte-C (peg3350/sod sulf,bicarb,cl/kcl) Other prescribers in San PAblo, CA | 44 |
| Famotidine Other prescribers in San PAblo, CA | 44 |
| Linzess (linaclotide) Other prescribers in San PAblo, CA | 35 |
| Gavilyte-G (peg3350/sod sulf,bicarb,cl/kcl) Other prescribers in San PAblo, CA | 31 |
| Mesalamine Other prescribers in San PAblo, CA | 22 |
| Sod Sulf-Potass Sulf-Mag Sulf (sodium, potassium,mag sulfates) Other prescribers in San PAblo, CA | 19 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 11 companies reported 52 payments worth $1,658 in total to this clinician.
| Janssen Biotech, Inc. | $590 |
|---|---|
| Madrigal Pharmaceuticals | $312 |
| AbbVie Inc. | $233 |
| Takeda Pharmaceuticals U.S.A., Inc. | $140 |
| Braintree Laboratories, Inc. | $77.44 |
| Lilly USA, LLC | $66.05 |
| Phathom Pharmaceuticals, Inc. | $62.56 |
| Aimmune Therapeutics, Inc. | $61.62 |
| Food and Beverage | $1,658 |
|---|
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.
Industry-funded research
Named as a principal investigator on 1 industry-funded study in 2025, from 1 company. The companies reported $7,812 in research payments for these studies, mostly to the institutions running them.
- A Study to Evaluate the Long-Term Efficacy and Safety of Mirikizumab in Participants With Moderately to Severely Active Ulcerative Colitis (LUCENT 3)
Eli Lilly and Company · Active, not recruiting · NCT03519945
From CMS Open Payments research payments, where companies name up to five principal investigators per payment. Research payments usually go to hospitals, universities and research sites, not to the investigator personally. A payment is not evidence of wrongdoing.