Quick answers
- Which hospitals does Jeffrey C. Mark work at?
- Medicare's official clinician data lists Jeffrey C. Mark at 1 hospital: Emanuel Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jeffrey C. Mark see patients?
- Medicare's clinician data lists 1 practice location in San Ramon, CA. Call before your visit to confirm the address.
- What is Jeffrey C. Mark's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Jeffrey C. Mark accept Medicare assignment?
- Yes. Medicare's clinician data says Jeffrey C. Mark 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.
- What is the phone number for Jeffrey C. Mark?
- (925) 818-2785, as listed in official Medicare / NPI Registry data.
- What is Jeffrey C. Mark's NPI number?
- 1487603155. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jeffrey C. Mark works
Medicare's Facility Affiliation Data lists Jeffrey C. Mark at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Emanuel Medical CenterTurlock, CA · Acute Care Hospital · CCN 050179
Practice locations
Addresses where Jeffrey C. Mark is enrolled with Medicare (CMS data updated 2026-10-02).
- 111 Deerwood Rd, Suite 168San Ramon, CA 94583 (925) 818‑2785
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in San Ramon
Clinicians with the same Medicare primary specialty in San Ramon, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Illinois College Of Med (chi/peor/rock/chm-Urb) |
| Graduation year | 1992 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1487603155 |
| 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