Quick answers
- Which hospitals does Stefan Sien work at?
- Medicare's official clinician data lists Stefan Sien at 4 hospitals: Loma Linda University Medical Center-Murrieta, Menifee Global Medical Center, Southwest Healthcare Rancho Springs Hospital and Temecula Valley Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Stefan Sien see patients?
- Medicare's clinician data lists 2 practice locations, including Temecula, CA and Murrieta, CA. Call before your visit to confirm the address.
- What is Stefan Sien's specialty?
- Medicare lists Pulmonary Disease as the primary specialty, and also Critical Care (Intensivists) and Internal Medicine.
- Does Stefan Sien accept Medicare assignment?
- Yes. Medicare's clinician data says Stefan Sien 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.
- Does Stefan Sien offer telehealth?
- Medicare's clinician data says Stefan Sien offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Stefan Sien?
- (951) 566-5646, as listed in official Medicare / NPI Registry data.
- What is Stefan Sien's NPI number?
- 1932319464. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Stefan Sien works
Medicare's Facility Affiliation Data lists Stefan Sien at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Loma Linda University Medical Center-MurrietaMurrieta, CA · Acute Care Hospital · CCN 050770
- Menifee Global Medical CenterSun City, CA · Acute Care Hospital · CCN 050684
- Southwest Healthcare Rancho Springs HospitalMurrieta, CA · Acute Care Hospital · CCN 050701
- Temecula Valley HospitalTemecula, CA · Acute Care Hospital · CCN 050775
Practice locations
Addresses where Stefan Sien is enrolled with Medicare (CMS data updated 2026-10-02).
- 27699 Jefferson Ave, Suite 204Temecula, CA 92590 (951) 566‑5646
- 28078 Baxter Rd, Suite 324Murrieta, CA 92563 (951) 566‑5646
Group practices
Medicare enrollment lists Stefan Sien as a member of this group (CMS data updated 2026-10-02).
- Inspire Pulmonary and Sleep Medicine Specialist4 clinicians in the group
Specialties
Other pulmonologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2005 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1932319464 |
| 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