Clinicians affiliated with Uc Regents

319 clinicians on file with this group · most practice in Los Angeles-Long Beach-Anaheim, CA · PAC ID 7416869516

Affiliation snapshotOctober 2, 2026CMS Doctors and Clinicians file, current snapshot (no end-of-2024 archive), applied to 2024
Activity year2024Medicare Part B claims, Original Medicare fee-for-service

250 clinicians affiliated with Uc Regents are in the 2024 Medicare Part B data, 209 of them physicians. Data years with affiliated clinicians: 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024.

Each clinician's exact figures are in their Physician Report, from their page; a specialty's figures in this market are in a Market Comparison. View sample report · Already purchased? Open your report

Affiliated clinicians by specialty, 2024

All specialties · Internal Medicine (68) · Hematology-Oncology (31) · Nurse Practitioner (26) · Gastroenterology (20) · Pulmonary Disease (20) · Cardiology (12) · Nephrology (11) · Physician Assistant (9) · Endocrinology (7) · Critical Care (Intensivists) (5) · Infectious Disease (5) · Medical Oncology (4) · Rheumatology (4) · Family Practice (3) · Advanced Heart Failure and Transplant Cardiology (2) · Allergy/ Immunology (2) · Clinical Cardiac Electrophysiology (2) · General Surgery (2) · Pediatric Medicine (2) · Psychologist, Clinical (2) · Registered Dietitian or Nutrition Professional (2) · Sleep Medicine (2) · Anesthesiology (1) · Geriatric Medicine (1) · Hematology (1) · Hospitalist (1) · Obstetrics & Gynecology (1) · Physical Medicine and Rehabilitation (1) · Physical Therapist in Private Practice (1) · Podiatry (1) · Preventive Medicine (1)

Specialty links go to the specialty in Los Angeles-Long Beach-Anaheim, CA.

Clinicians affiliated with Uc Regents, 2024

Alphabetical by last name; 201–250 of 250.

NameSpecialtyCity
Mark S SalemGastroenterologyOrange, CA
Jason B Samarasena, M.D.Internal MedicineOrange, CA
Bobby Sasson, M.D., M.P.H.Internal MedicineIrvine, CA
Alan R Schenk, M.D.RheumatologyLaguna Woods, CA
Sherry F Schulman, RDNRegistered Dietitian or Nutrition ProfessionalSan Juan Capistrano, CA
Paurush L Shah, MDGastroenterologyOrange, CA
Rachna M Shah, PA-CPhysician AssistantLong Beach, CA
Imran Sharief, MDCritical Care (Intensivists)Tustin, CA
Mohaddeseh SharifzadehRheumatologyWest Burlington, IA
Adarsh M Sharma, M.D.Pulmonary DiseaseNewport Beach, CA
Elisa SinghPhysician AssistantOrange, CA
Julie Smith, NPNurse PractitionerOrange, CA
Ryan SobredoNurse PractitionerOrange, CA
Martha Sosa-Johnson, MDInternal MedicineOrange, CA
Kimberly A SungNurse PractitionerIrvine, CA
Satinder Swaroop, MDInternal MedicineFountain Valley, CA
Alexander J Sweidan, MDPulmonary DiseaseCosta Mesa, CA
John Sy, M.D.NephrologyLong Beach, CA
Ekamol Tantisattamo, MDNephrologyOrange, CA
Aditi Thakkar, MBBSEndocrinologyOrange, CA
Simin Torabzadeh, MDGeriatric MedicineOrange, CA
Thu M Tran, NPNurse PractitionerIrvine, CA
Kashyap H Trivedi, MDGastroenterologyOrange, CA
Thuha T Truax, N.P.-C, MSNNurse PractitionerOrange, CA
Kevin L Truong, MD, MBAInternal MedicineValencia, CA
Natalia Ullrich, REGISTERED DIETITIANRegistered Dietitian or Nutrition ProfessionalIrvine, CA
Deepti Upparapalli, M.D.Advanced Heart Failure and Transplant CardiologyOrange, CA
Poorva VaidyaHematology-OncologyOrange, CA
Jennifer B Valerin, M.D.Hematology-OncologyOrange, CA
Eugene T Van, D.O.Internal MedicineInglewood, CA
Richard A Vanetten, MDInternal MedicineOrange, CA
Katarina Veskovic, M.D.Internal MedicineIrvine, CA
Victoria M Villaflor, M.D.Medical OncologyOrange, CA
Janette C Villalon, PA-CPhysician AssistantOrange, CA
Miguel A Villalona Calero, M.D.Medical OncologyOrange, CA
Kristin Viola, PAPhysician AssistantOrange, CA
Thomas W Waddington, M.D.Pulmonary DiseaseOrange, CA
Tammy WongSleep MedicineLos Angeles, CA
Mark E Wylam, M.D.Critical Care (Intensivists)Orange, CA
Aileen Xu, FNPNurse PractitionerNewport Beach, CA
Jennifer Xu, M.D.CardiologyOrange, CA
Bassam Yaghmour, M.D.Pulmonary DiseaseOrange, CA
Qin YangInternal MedicineIrvine, CA
Beshoy T Yanny, M.D.GastroenterologyLos Angeles, CA
Yesim Yilmaz Demirdag, M.D.Allergy/ ImmunologyIrvine, CA
Fady Youssef, M.D.Pulmonary DiseaseLong Beach, CA
Austin H Yu, MDPulmonary DiseaseLos Alamitos, CA
Elliot S Yu, M.D.GastroenterologyOrange, CA
Jason Zell, DOHematology-OncologyOrange, CA
Mohammadbagher Ziari, MDHematology-OncologyCorona, CA

Practice locations

Listed practice locations in California.

Source: CMS Doctors and Clinicians National Downloadable File, snapshot October 2, 2026.

Membership comes from the CMS Doctors and Clinicians file. CMS does not publish an end-of-year archive of it, so the current snapshot is applied to every data year. A clinician affiliated with several groups or hospitals appears on each of their pages. How group pages are built · Limitations