Quick answers
- Which hospitals does Mark Zeme work at?
- Medicare's official clinician data lists Mark Zeme at 1 hospital: Eden Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark Zeme see patients?
- Medicare's clinician data lists 1 practice location in Castro Valley, CA. Call before your visit to confirm the address.
- What is Mark Zeme's specialty?
- Medicare lists Otolaryngology as the primary specialty.
- Does Mark Zeme accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Zeme 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 Mark Zeme?
- (510) 889-6673, as listed in official Medicare / NPI Registry data.
- What is Mark Zeme's NPI number?
- 1669400388. 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 Zeme works
Medicare's Facility Affiliation Data lists Mark Zeme at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Eden Medical CenterCastro Valley, CA · Acute Care Hospital · CCN 050488
Practice locations
Addresses where Mark Zeme is enrolled with Medicare (CMS data updated 2026-10-02).
- 20400 Lake Chabot Rd, Suite 301Castro Valley, CA 94546 (510) 889‑6673
Specialties
- Otolaryngologyprimary
Other ENT doctors in Castro Valley
Clinicians with the same Medicare primary specialty in Castro Valley, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Michigan Medical School |
| Graduation year | 1987 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1669400388 |
| 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