Quick answers
- Which hospitals does Douglas E. Dennis work at?
- Medicare's official clinician data lists Douglas E. Dennis at 1 hospital: Memorialcare Orange Coast Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Douglas E. Dennis see patients?
- Medicare's clinician data lists 1 practice location in Fountain Valley, CA. Call before your visit to confirm the address.
- What is Douglas E. Dennis's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Emergency Medicine.
- Does Douglas E. Dennis accept Medicare assignment?
- Yes. Medicare's clinician data says Douglas E. Dennis 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 Douglas E. Dennis?
- (714) 378-7000, as listed in official Medicare / NPI Registry data.
- What is Douglas E. Dennis's NPI number?
- 1639182280. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Douglas E. Dennis works
Medicare's Facility Affiliation Data lists Douglas E. Dennis at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Memorialcare Orange Coast Medical CenterFountain Valley, CA · Acute Care Hospital · CCN 050678
Practice locations
Addresses where Douglas E. Dennis is enrolled with Medicare (CMS data updated 2026-10-02).
- 9920 Talbert AveFountain Valley, CA 92708 (714) 378‑7000
Group practices
Medicare enrollment lists Douglas E. Dennis as a member of this group (CMS data updated 2026-10-02).
- Cep America - California1,292 clinicians in the group
Specialties
- Internal Medicineprimary
- Emergency Medicinealso
Other internal medicine doctors in Fountain Valley
Clinicians with the same Medicare primary specialty in Fountain Valley, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1986 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639182280 |
| 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