Quick answers
- Which hospitals does Preston P. Sitorus work at?
- Medicare's official clinician data lists Preston P. Sitorus at 1 hospital: Kaiser Foundation Hospital - Orange County - Anaheim. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Preston P. Sitorus see patients?
- Medicare's clinician data lists 6 practice locations, including Anaheim, CA and Irvine, CA. Call before your visit to confirm the address.
- What is Preston P. Sitorus's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Preston P. Sitorus accept Medicare assignment?
- Yes. Medicare's clinician data says Preston P. Sitorus 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 Preston P. Sitorus?
- (888) 988-2800, as listed in official Medicare / NPI Registry data.
- What is Preston P. Sitorus's NPI number?
- 1194305847. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Preston P. Sitorus works
Medicare's Facility Affiliation Data lists Preston P. Sitorus at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Kaiser Foundation Hospital - Orange County - AnaheimAnaheim, CA · Acute Care Hospital · CCN 050609
Practice locations
Addresses where Preston P. Sitorus is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 3430 E La Palma AveAnaheim, CA 92806 (888) 988‑2800
- 3460 E La Palma AveAnaheim, CA 92806 (714) 644‑2010
- 5475 E La Palma AveAnaheim, CA 92807 (714) 279‑6088
- 6640 Alton PkwyIrvine, CA 92618 (949) 932‑5000
- 6650 Alton PkwyIrvine, CA 92618 (949) 932‑5000
Group practices
Medicare enrollment lists Preston P. Sitorus as a member of this group (CMS data updated 2026-10-02).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Anaheim
Clinicians with the same Medicare primary specialty in Anaheim, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Un Of California, Riverside, School Of Medicine |
| Graduation year | 2021 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1194305847 |
| 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