Quick answers
- Which hospitals does Mark H. Kogan work at?
- Medicare's official clinician data lists Mark H. Kogan at 4 hospitals: Alta Bates Summit Medical Center, Alta Bates Summit Medical Center - Alta Bates Camp…, Contra Costa Regional Medical Center and Ridgecrest Regional Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark H. Kogan see patients?
- Medicare's clinician data lists 6 practice locations, including Ridgecrest, CA, San Pablo, CA and Berkeley, CA. Call before your visit to confirm the address.
- What is Mark H. Kogan's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Mark H. Kogan accept Medicare assignment?
- Yes. Medicare's clinician data says Mark H. Kogan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Mark H. Kogan offer telehealth?
- Medicare's clinician data says Mark H. Kogan offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark H. Kogan?
- (760) 446-8692, as listed in official Medicare / NPI Registry data.
- What is Mark H. Kogan's NPI number?
- 1780690313. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark H. Kogan works
Medicare's Facility Affiliation Data lists Mark H. Kogan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Alta Bates Summit Medical CenterOakland, CA · Acute Care Hospital · CCN 050043
- Alta Bates Summit Medical Center - Alta Bates Camp…Berkeley, CA · Acute Care Hospital · CCN 050305
- Contra Costa Regional Medical CenterMartinez, CA · Acute Care Hospital · CCN 050276
- Ridgecrest Regional HospitalRidgecrest, CA · Critical Access Hospital · CCN 051333
Practice locations
Addresses where Mark H. Kogan is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 1041 N China Lake BlvdRidgecrest, CA 93555 (760) 446‑8692
- 1081 N China Lake BlvdRidgecrest, CA 93555 (760) 499‑3899
- 2089 Vale Rd, Suite 33San Pablo, CA 94806 (510) 234‑5012
- 2450 Ashby AveBerkeley, CA 94705
- 2450 Ashby Ave, Rm 5505Berkeley, CA 94705 (510) 204‑4444
Group practices
Medicare enrollment lists Mark H. Kogan as a member of these groups (CMS data updated 2026-10-02).
- Sutter Bay Medical Foundation3,829 clinicians in the group
- Genesis Healthcare Partners PC228 clinicians in the group
- Ridgecrest Regional Hospital95 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Ridgecrest
Clinicians with the same Medicare primary specialty in Ridgecrest, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Northwestern University Feinberg Medical School |
| Graduation year | 1980 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1780690313 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians