Stefan Sien, D.O.
NPI 1932319464 · Pulmonary Disease Physician · Murrieta, CA
Enrolled with Medicare as Practitioner - Pulmonary Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stefan Sien, D.O. is a Pulmonary Disease Physician provider in Murrieta, CA (NPI 1932319464).
Provider details
- NPI number
- 1932319464
- Entity type
- Individual
- Primary specialty
- Pulmonary Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 20A12378 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,424 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 495 | $132 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 290 | $117 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 111 | $170 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 72 | $171 |
| Test to Determine Lung Volumes Using Sensors94726 | 64 | $59 |
| Test to Measure Expiratory Airflow and Volume Changes Before and After Medication Administration94060 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 39 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 543 | 119 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 430 | 136 |
| Prednisone | 275 | 120 |
| Fluticasone/Vilanterolbrand: Breo Ellipta | 256 | 66 |
| Budesonide/Glycopyr/Formoterolbrand: Breztri Aerosphere | 202 | 55 |
| Umeclidinium Brm/Vilanterol Trbrand: Anoro Ellipta | 192 | 42 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$4,942 across 120 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-23
- Last updated
- 2021-06-09
- Certified
- 2021-05-25
Frequently asked questions
- What is Stefan Sien's NPI number?
- Stefan Sien's National Provider Identifier (NPI) is 1932319464, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stefan Sien's specialty?
- Stefan Sien is listed in the NPPES registry with a primary specialty of Pulmonary Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Stefan Sien located?
- Stefan Sien's practice location on file with NPPES is 28078 Baxter Rd Ste 324, Murrieta, CA 92563-1404.
- What is Stefan Sien's phone number?
- The practice phone number listed in the NPPES registry for Stefan Sien is (951) 566-5646.
- Does Stefan Sien accept Medicare?
- Stefan Sien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stefan Sien's NPI active?
- Yes — Stefan Sien's NPI (1932319464) is active in the NPPES registry as of the last update on 2021-06-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.