Southern California’s Premier Independent Multi-Specialty Medical & Surgical Group
ONE OF THE LARGEST INTEGRATED PRIVATE PRACTICES IN CALIFORNIA



About United Medical Doctors
UNPARALLELED SPECIALTY MEDICAL & SURGICAL CARE
United Medical Doctors (UMD) is dedicated to improving the health of our communities by setting the standard of excellence in specialty medical & surgical care. UMD currently offers over 30 medical & surgical specialties with over 150 providers in four Southern California counties: Riverside, Orange, San Diego & Los Angeles.
At United Medical Doctors, we specifically aim to:
· Provide the highest quality compassionate care and service for all people in the prevention, diagnosis, and treatment of medical and surgical diseases.
· Attract a team of physicians and other health care professionals of the highest moral character and greatest skill.
· Be the premier Independent Private Practice in our region with a dedication to achieving the highest levels of patient satisfaction while implementing continued process improvement.
· Provide our patients access to advanced cutting-edge specialty services by leveraging our group’s resources and close relationships and affiliations with University medical centers in the region.
· Demonstrate empathy in caring for patients which is more than just physical healing – it’s establishing a connection and trusting relationship with care that encompasses mind, body, and spirit.
Allergy | Anesthesia | Audiology | Bariatric Surgery | Cardiology | Clinical Research | Colorectal Surgery | Dermatology | Dietitian | Family Medicine | Fitness | Gastroenterology | General Surgery | Gynecology | Hepatology | Imaging | Infusion Therapy | Internal Medicine | Medical Weight Loss | Men’s Health | Neurosurgery | Oncology | Otorhinolargynology (ENT) | Orthopedic Surgery | Pain Management | Pathology | Pediatric Gastroenterology | Plastic Surgery | Podiatry | Radiology | Urgent Care | Urogynecology & Female Pelvic Health | Urology | Wound Care
UMD is proud to offer unparalleled outpatient surgical care at our Ambulatory Surgery Centers through our United Surgery Centers division: United Surgery Centers (USC). USC has locations in Temecula, Murrieta, Riverside, Newport Beach, Orange, Irvine, Mission Viejo and Encinitas.
UMD is proud to conduct clinical research that leads to advancements in medical treatment by producing high quality data retrieved in a confidential, comfortable and safe environment. United Clinical Research consists of state-of-the-art surgery centers and research sites in Riverside, San Diego and Orange Counties. We carefully and compassionately evaluate each study patient and firmly adhere to study protocol. By thoroughly planning for each study, we are able to deliver reliable and verifiable research results. Our site is fully equipped to conduct complex clinical research trials on behalf of our sponsors and our study trial participants. By providing different treatment options to best meet individual healthcare needs; not only do we offer the medicine of today, we help create the medicine of the future.

Schedule an Appointment
Scheduling an appointment is simple. We are proud to offer multiple ways to receive care, including Telemedicine visits. For new and existing patients who are scheduling an office visit or follow-up appointment , click the button below to use our Online Scheduler. Appointments are subject to insurance verification.
How We Can Help You
LEARN ABOUT OUR COMPREHENSIVE SERVICES

Medical Specialties

Urgent Care

Laboratory

Medical Fitness Facility

Surgical Specialties

Outpatient Surgery Centers

Online Appt Scheduling

Medical Weight Loss

Telemedicine Appointments

Imaging Centers

IV Infusion Therapy

Clinical Research
SPECIALTIES
UNITED UNIVERSITY OF NURSING NOW ENROLLING
OVER 30 LOCATIONS IN SOUTHERN CALIFORNIA
Your Healthcare Team
MEET OUR PROVIDERS
We are committed to providing the highest quality compassionate care & service for all people in the prevention, diagnosis & treatment of medical and surgical diseases.
Meet our team of providers, who strive to demonstrate empathy in caring for patients which is more than just physical healing – it’s establishing a connection and trusting relationship with care that encompasses mind, body, and spirit.

What Our Patients Say
United Gastroenterologists | Dr. Roxanne Lim
United Pain Center | Dr. Yi Cai
United Gastroenterologists | Dr. Philip T. Chen
United Medical Doctors Urgent Care
United Gastroenterologists | Bryan Sauter, PA-C
United Gastroenterologists | Dr. Huafeng Shen
United Gastroenterologists | Dr. Angela Saunders
United Gastroenterologists | Dr. Katharine Eng
United Oncology | Dr. Howard Cheng
United Gastroenterologists | Dr. Shruti Ariza
United Imaging x Backbay Imaging
United Neurosurgery | Dr. Anthony Kim
Frequently AskedQuestions
It’s simple! You can make an appointment online below, call us at (833) UMD-DOCS or through our via our Mobile App, United MD. Contact us to receive your personalized login information for the United MD app today.
All of our specialists accept most major PPOs, Medicare and Tricare as well as some HMO insurance plans. To verify, please call our United MD Appointment Center at (833) UMD-DOCS.
Yes! We offer multiple options to receive care, including virtually through Telemedicine Appointments. We conduct our Telemedicine Appointments through our own Mobile App, United MD. Contact us to receive your personalized login information today.
Thank you for your interest in our practice and our skilled specialists! Please contact us at (833) UMD-DOCS to get set up in our system, or fill out the contact form below.