Dr. Stefan Sien, DO

Dr. Sien practices at Pet CT Pob - Positron Emission Tomography, Computed Tomography Professional Office Building - HOPD in Murrieta, California.

Dr. Sien's NPI, 1932319464, was assigned on May 23, 2007. Dr. Sien graduated from WesternU College of Osteopathic Medicine of the Pacific in 2005. Dr. Sien holds California license 20A12378.

Dr. Sien's primary practice is Pet CT Pob - Positron Emission Tomography, Computed Tomography Professional Office Building - HOPD, at 28078 Baxter Road, Murrieta, CA 92563.

Dr. Sien's primary practice is Pet CT Pob - Positron Emission Tomography, Computed Tomography Professional Office Building - HOPD in Murrieta, California. Dr. Sien is also affiliated with Southwest Healthcare Rancho Springs Hospital. The medical group on file is UC San Diego Health. Dmand AI also links Dr. Sien to 3 more hospitals, 2 group practices and clinics and 2 medical groups, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Sien practices, 7 sites in all. Vendor and product names are available with a free account.

Pulmonary disease is Dr. Sien's primary specialty in the NPI Registry, under taxonomy code 207RP1001X. Dr. Sien is board certified in critical care medicine (caq) by the AOA Board of Internal Medicine. Dr. Sien is licensed in California.

Dmand AI lists acute sinusitis, asthma, bronchitis, chronic obstructive pulmonary disease (COPD), chronic respiratory failure, chronic sinusitis, pleural effusion and pneumonia among the conditions Dr. Sien treats.

CMS data shows 1,424 Medicare services from Dr. Sien across 15 procedure codes in 2024, for 443 Medicare patients. Medicare paid $124,780 for them.

CMS counts 443 Medicare patients who saw Dr. Sien in 2024. The largest group is 65 to 74, with 176 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 22% are also on Medicaid. Their average risk score is 2.35, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Sien's median patient age at 74, with 57% women.

In 2024, Dr. Sien wrote 3,565 Medicare Part D claims for 528 patients. CMS names the drug for 3,416 of them, across 39 drugs with 11 or more claims each, at $2,337,485 in total drug cost. In 2023, CMS named 2,940 claims across 39 drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 22 out of 100 for Dr. Sien for performance year 2024, reported individually. Dr. Sien accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Sien as offering telehealth.

CMS Open Payments shows 847 general payments to Dr. Sien from 54 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 71% of the total. Intuitive Surgical, Inc. paid the most, $7,533.

Dr. Sien serves on Medical Executive Committee and Quality Review Committee.

Dr. Sien graduated from WesternU College of Osteopathic Medicine of the Pacific in 2005. Dr. Sien is a member of ACCP, ACOI, AOA, Osteopathic Physicians and Surgeons of California and Society of Critical Care Medicine.

Dr. Sien is in network with 16 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.