Quick answers
- Which hospitals does Irene Tan work at?
- Medicare's official clinician data lists Irene Tan at 1 hospital: Adventist Health Simi Valley. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Irene Tan see patients?
- Medicare's clinician data lists 1 practice location in Simi Valley, CA. Call before your visit to confirm the address.
- What is Irene Tan's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Irene Tan accept Medicare assignment?
- Yes. Medicare's clinician data says Irene Tan 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 Irene Tan?
- (805) 527-8055, as listed in official Medicare / NPI Registry data.
- What is Irene Tan's NPI number?
- 1699942425. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Irene Tan works
Medicare's Facility Affiliation Data lists Irene Tan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Adventist Health Simi ValleySimi Valley, CA · Acute Care Hospital · CCN 050236
Practice locations
Addresses where Irene Tan is enrolled with Medicare (CMS data updated 2026-10-02).
- 1147 Red Tail WaySimi Valley, CA 93065 (805) 527‑8055
Group practices
Medicare enrollment lists Irene Tan as a member of this group (CMS data updated 2026-10-02).
- Simi Obstetrics and Gynecology Medical Group a Medical Corp4 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Simi Valley
Clinicians with the same Medicare primary specialty in Simi Valley, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2004 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1699942425 |
| 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