Quick answers
- Which hospitals does Mark S. Singer work at?
- Medicare's official clinician data lists Mark S. Singer at 1 hospital: Providence Queen of the Valley Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark S. Singer see patients?
- Medicare's clinician data lists 1 practice location in Napa, CA. Call before your visit to confirm the address.
- What is Mark S. Singer's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Emergency Medicine.
- Does Mark S. Singer accept Medicare assignment?
- Yes. Medicare's clinician data says Mark S. Singer 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 S. Singer?
- (707) 365-5151, as listed in official Medicare / NPI Registry data.
- What is Mark S. Singer's NPI number?
- 1962486332. 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 S. Singer works
Medicare's Facility Affiliation Data lists Mark S. Singer at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Providence Queen of the Valley Medical CenterNapa, CA · Acute Care Hospital · CCN 050009
Practice locations
Addresses where Mark S. Singer is enrolled with Medicare (CMS data updated 2026-10-02).
- 3334 Sterling CtNapa, CA 94558 (707) 365‑5151
Specialties
- Internal Medicineprimary
- Emergency Medicinealso
Other internal medicine doctors in Napa
Clinicians with the same Medicare primary specialty in Napa, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Geffen School Of Medicine |
| Graduation year | 1983 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1962486332 |
| 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