Willy Chi, D.O.

Willy Yung-Wei Chi, D.O.


Vascular Surgery


Internal Medicine


  • Clinical Professor of Medicine


To see if Willy Yung-Wei Chi is accepting new patients, or for assistance finding a UC Davis doctor, please call 800-2-UCDAVIS (800-282-3284).

Lawrence J. Ellison Ambulatory Care Center

4860 Y St., Suite 2100
Sacramento, CA 95817
Driving Directions

Primary Phone:

UC Davis Medical Group - Folsom

251 Turn Pike Dr.
Folsom, CA 95630
Driving Directions

Primary Phone:

Additional Phone Numbers

Clinic Phone: 916-734-3761
Clinic Fax: 916-734-3801
Clinic Fax: 916-295-5764
Physician Referrals: 800-4-UCDAVIS (800-482-3284)

Philosophy of Care

I will always put you, my patient(s), at the center of any care plan thru compassion and honesty.

Clinical Interests

Dr. Chi is a nationally recognized vascular medicine expert with clinical expertise in non-invasive management of venous, arterial and lymphatic disorders.

Research/Academic Interests

Dr. Chi is a prolific author and researcher; he has presented research work and lectured at major national and international meetings. His research focuses on vascular ultrasound imaging, cellular based/angiogenesis therapy for peripheral arterial disease and minimal invasive intervention for venous disease.


Cardiovascular Medicine

Center/Program Affiliation

Vascular Center
UC Davis Medical Group


D.O., Kansas City University, Kansas City MO 1997

B.S., UC Irvine, Irvine CA 1992

Internship: Internal Medicine, Cleveland Clinic Foundation, Cleveland OH 1997-1998


Internal Medicine, Cleveland Clinic Foundation, Cleveland OH 1998-2000


Cardiovascular Medicine/Vascular Medicine, Cleveland Clinic Foundation, Cleveland OH 2000-2001

Board Certifications

American Board of Internal Medicine, 2020

American Board of Vascular Medicine, 2017

American Board of Venous and Lymphatic Medicine,

Professional Memberships

American Heart Association

American Venous and Lymphatic Society

Society for Vascular Medicine

Honors and Awards

American College of Phlebology PRO Venous Registry Grant, 2016

UC COR Large Grant, 2016

Hiroshi Miyake Award, IMAP of Sao Paulo, Brazil, 2016

UC Science and Translation Innovation Research Grant (STAIR), 2015

Select Recent Publications

Gianesini S, Menegatti E, Bottini O, Chi YW. Review on Disasters and Lower Limb Venous Disease. Ann Vasc Dis. 2021 Oct. doi:10.3400/avd.ra.21-00026.

Menegatti E, Mandini S, Chi YW, Mazzoni G, Pagani A, Malagoni AM, Tessari M, Costa AL, Avruscio G, Zamboni P, Gianesini S. Physical fitness changes induced by thermal aquatic standardized exercise in chronic venous disease patients. Phlebology. 2021 Oct 11:2683555211051962. doi:10.1177/02683555211051962. Epub ahead of print. PMID:34633888.

Zhang Z, Zhang R, Chang CW, Guo Y, Chi YW, Pan T. iWRAP: A Theranostic Wearable Device With Real-Time Vital Monitoring and Auto-Adjustable Compression Level for Venous Thromboembolism. IEEE Trans Biomed Eng. 2021 Sep;68(9):2776-2786. doi:10.1109/TBME.2021.3054335. Epub 2021 Aug 23. PMID:33493109.

Yang Q, Zhao Y, Chen X, Tang P, Li L, Zhao J, Han Y, Wu D, An L, Zhang B, Zhou X, Liu L, Chi YW. Association between vein diameters, reflux characteristics, and clinical severity in patients with chronic venous insufficiency in Northwest China. J Vasc Surg Venous Lymphat Disord. 2021 Mar;9(2):401-408.e1. doi:10.1016/j.jvsv.2020.07.006. Epub 2020 Jul 28. PMID:32730997.

Miyake RK, Chi YW, Franklin IJ, Gianesini S. State of the art on cryo-laser cryo-sclerotherapy in lower limb venous aesthetic treatment. J Vasc Surg Venous Lymphat Disord. 2020 Sep;8(5):893-895. doi:10.1016/j.jvsv.2020.01.003. Epub 2020 Mar 14. PMID:32179040.

Gianesini S, Mosti G, Raffetto JD, Maietti E, Chi YW, Tangerini L, Menegatti E. Case-control evaluation of the impact of below 20 mmHg elastic compression stockings on lower limb volume serial variations in standardized flights. Phlebology. 2020 Apr;35(3):199-206. doi:10.1177/0268355519873527. Epub 2019 Sep 5. PMID:31488042.

Chi YW, Lin R, Tseng KH, Durbin-Johnson B. Effect of subsurface pressure on the interface pressure measurement in an in vitro experiment. Phlebology. 2020 Mar;35(2):134-138. doi:10.1177/0268355519857627. Epub 2019 Jun 24. PMID:31234751.

Gianesini S, Obi A, Onida S, Baccellieri D, Bissacco D, Borsuk D, Campisi C, Campisi CC, Cavezzi A, Chi YW, Chunga J, Corda D, Crippa A, Davies A, De Maeseneer M, Diaz J, Ferreira J, Gasparis A, Intriago E, Jawien A, Jindal R, Kabnick L, Latorre A, Lee BB, Liew NC, Lurie F, Meissner M, Menegatti E, Molteni M, Morrison N, Mosti G, Narayanan S, Pannier F, Parsi K, Partsch H, Rabe E, Raffetto J, Raymond-Martimbeau P, Rockson S, Rosukhovski D, Santiago FR, Schul A, Schul M, Shaydakov E, Sibilla MG, Tessari L, Tomaselli F, Urbanek T, van Rijn MJ, Wakefield T, Wittens C, Zamboni P, Bottini O. Global guidelines trends and controversies in lower limb venous and lymphatic disease: Narrative literature revision and experts' opinions following the vWINter international meeting in Phlebology, Lymphology & Aesthetics, 23-25 January 2019. Phlebology. 2019 Sep;34(1 Suppl):4-66. doi:10.1177/0268355519870690. PMID:31495256.

Chi YW, Gianesini S, Wang SM. A review on superficial venous thrombosis of the lower extremities. Vasc Invest Ther. 2019 Jan;2(4):95-7. doi:10.4103/VIT.VIT_19_19.

Gianesini S, Zimmet S, Bottini O, Neuhardt D, Meissner M, Gibson K, Kalodiki E, Lattimer CR, Spath P, Tessari L, Tessari M, Chi YW, Sibilla MG, Menegatti E. Increasing public venous awareness, graduated compression stockings compliance and scientific data collection through open events on gold courses: A feasibility study. Veins and Lymphatics. 2018;7(2). doi:10.4081/vl.2018.7631.