Quick answers
- Which hospitals does Sergio O. Neira work at?
- Medicare's official clinician data lists Sergio O. Neira at 1 hospital: St Johns Regional Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sergio O. Neira see patients?
- Medicare's clinician data lists 1 practice location in Oxnard, CA. Call before your visit to confirm the address.
- What is Sergio O. Neira's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Sergio O. Neira accept Medicare assignment?
- Yes. Medicare's clinician data says Sergio O. Neira 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 Sergio O. Neira?
- (805) 981-8300, as listed in official Medicare / NPI Registry data.
- What is Sergio O. Neira's NPI number?
- 1043373194. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sergio O. Neira works
Medicare's Facility Affiliation Data lists Sergio O. Neira at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- St Johns Regional Medical CenterOxnard, CA · Acute Care Hospital · CCN 050082
Practice locations
Addresses where Sergio O. Neira is enrolled with Medicare (CMS data updated 2026-10-02).
- 1901 Outlet Ctr Dr, Suite 200Oxnard, CA 93036 (805) 981‑8300
Group practices
Medicare enrollment lists Sergio O. Neira as a member of these groups (CMS data updated 2026-10-02).
- Primary Medical Group of Ventura County Inc41 clinicians in the group
- Spanish Hills Medical Group Inc3 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Oxnard
Clinicians with the same Medicare primary specialty in Oxnard, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1973 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1043373194 |
| 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