Doctor profile · Federal record
Dr. Stefan Sien, D.O.
Pulmonary Disease Physician (CMS: Pulmonary Disease) · Critical Care Medicine (Internal Medicine) Physician · Murrieta, CA
- NPI 1932319464
- Accepts Medicare
- MIPS 13.3 / 100 · 2023
- 21 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
28078 Baxter RD Ste 324
Murrieta, CA 925631404
(951) 566-5646
fax (951) 566-5670
Credentials & registration
- NPI registered
- May 2007 — 19 yrs on file
- Profile last updated
- June 9, 2021
- Year of graduation
- 2005 — 21 yrs since
- Specialty taxonomy
- 207RP1001X — NUCC code
- State license (1)
- California #20A12378
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1932319464. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,428
Distinct HCPCS
10
Medicare allowed
$147,176
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 481 | 205 | $131 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 218 | 97 | $121 | |
94729 |
Test to examine how well the lungs exchange gases | 115 | 113 | $60 | |
94060 |
Test to measure expiratory airflow and volume changes before and after medication administration | 113 | 111 | $41 | |
94664 |
Evaluation of use of breathing device | 106 | 104 | $18 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 98 | 98 | $172 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 90 | 88 | $175 | |
94727 |
Test to determine lung volumes using gas dilution or washout | 64 | 64 | $46 | |
94200 |
Test to measure largest amount of air breathed in an out | 62 | 62 | $16 | |
94726 |
Test to determine lung volumes using sensors | 52 | 51 | $58 |
In context: peer comparison
Among 2 peers in Murrieta Pulmonary Disease Physician, average services per provider: 163. This provider delivers 8.8× the peer median.Open Payments
Industry payments received
All-time total
$4,942
Transactions
111
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Intuitive Surgical, INC. | 25 | $2,597.91 | |
| AstraZeneca Pharmaceuticals Lp | 14 | $351.47 | |
| GlaxoSmithKline, LLC. | 13 | $287.37 | |
| United Therapeutics Corporation | 5 | $273.78 | |
| Actelion Pharmaceuticals US, INC. | 15 | $201.60 | |
| Boehringer Ingelheim Pharmaceuticals, INC. | 8 | $178.03 | |
| Regeneron Healthcare Solutions, INC. | 5 | $154.11 | |
| Sanofi-Aventis U.S. LLC | 2 | $133.94 | |
| Takeda Pharmaceuticals U.S.A., INC. | 5 | $104.65 | |
| Grifols USA, LLC | 4 | $96.58 | |
| Shionogi INC | 4 | $92.82 | |
| Merck Sharp & Dohme LLC | 4 | $92.81 | |
| Genzyme Corporation | 3 | $80.53 | |
| Erbe USA INC | 1 | $73.22 | |
| Electromed, INC. | 3 | $41.86 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
2,444
Patients
748
Total drug cost
$1,059,763
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Trelegy Ellipta (Fluticasone/Umeclidin/Vilanter) | Brand | 546 | 131 | $453,300 |
| Albuterol Sulfate Hfa (Albuterol Sulfate) | Brand | 350 | 118 | $12,105 |
| Prednisone | Generic | 239 | 98 | $1,010 |
| Breo Ellipta (Fluticasone/Vilanterol) | Brand | 173 | 56 | $88,521 |
| Anoro Ellipta (Umeclidinium Brm/Vilanterol Tr) | Brand | 166 | 37 | $99,391 |
| Symbicort (Budesonide/Formoterol Fumarate) | Brand | 149 | 38 | $76,119 |
| Breztri Aerosphere (Budesonide/Glycopyr/Formoterol) | Brand | 142 | 46 | $106,962 |
| Stiolto Respimat (Tiotropium Br/Olodaterol Hcl) | Brand | 135 | 33 | $89,369 |
| Spiriva Respimat (Tiotropium Bromide) | Brand | 129 | 38 | $86,299 |
| Montelukast Sodium | Generic | 91 | 32 | $1,312 |
Hospital affiliations
Frequently asked questions
What is Dr. Stefan Sien's medical specialty?
Dr. Stefan Sien practices Pulmonary Disease Physician in Murrieta, CA.
Where does Dr. Stefan Sien practice?
Dr. Stefan Sien practices at 28078 Baxter RD Ste 324, Murrieta, CA 925631404. Office phone: 9515665646.
What is Dr. Stefan Sien's NPI?
Dr. Stefan Sien's National Provider Identifier (NPI) is 1932319464, issued by NPPES.
Does Dr. Stefan Sien accept Medicare assignment?
Yes. Dr. Stefan Sien accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Stefan Sien commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Test to examine how well the lungs exchange gases (HCPCS 94729). Source: CMS Medicare Physician & Other Practitioners file.