Millie Mei-Fun Leung, MD
I speak: English
My gender: Female
Where I practice
About me
I am a board-certified medical oncologist practicing at Kaiser Permanente’s Baldwin Park Medical Center. I am currently accepting new patients by referral. I am committed to delivering high-quality care that is based on evidence and current research and to supporting members through every stage of their cancer journey.
Biography
I received my medical degree from the USC School of Medicine in Los Angeles, California.
I completed my internship in internal medicine at UC San Diego School of Medicine in San Diego, followed by my residency in internal medicine at St. Mary Medical Center in Long Beach, California.
I then completed my fellowship training in hematology and oncology at Harbor-UCLA Medical Center in Los Angeles.
I am board certified in medical oncology by the American Board of Internal Medicine.
About my practice
My approach to care is rooted in thoughtful listening, clear communication, and individualized treatment planning. I strive to partner with each member to develop a care plan aligned with their medical needs, values, and long-term goals.
Practicing within Kaiser Permanente allows for close collaboration across specialties, for coordinated and comprehensive care.
My Cancer Subspecialty Focus
My clinical focus includes a broad range of cancers and blood disorders, with particular emphasis on malignant hematologic disorders and classic hematologic conditions. I care for adults with solid tumors, hematologic malignancies, and benign blood disorders.
National Expertise on Multidisciplinary Teams
I collaborate closely with teams that include specialists in medical oncology, hematology, radiation oncology, pathology, surgery, and supportive care services. This team-based approach helps ensure that members receive coordinated treatment that is based on evidence and current research and is aligned with national standards of care.
Research and Clinical Trials
I am actively involved in several National Cancer Institute–supported oncology research networks, including:
- SWOG Cancer Research Network
- National Surgical Adjuvant Breast and Bowel Project (NSABP)
- Alliance for Clinical Trials in Oncology
- NRG Oncology
As a sub-investigator on multiple clinical trials, I help bring innovative and promising therapies to patients in our community. My research also focuses on cancer survivorship, with an emphasis on improving long-term quality of life, minimizing complications, and reducing recurrence risk.
How I thrive
Outside of work, I value maintaining balance through time with family, staying active, and engaging in activities that support overall well-being.
My office
Languages spoken by medical staff
Help is available in your language. Learn more.
My provider type
Physicians and SurgeonsMedical groups, plans, and locations
Southern California Permanente Medical Group
Plans accepted
- Exclusive Provider Organization (EPO)
- HMO
- Medi-Cal Managed Care
- Point-of-Service Plan (POS)
- Senior Advantage
Baldwin Park Medical Center
Contact information
- Appointments
- 1-833-574-2273 (toll free)
- California Relay Service
- 711 (TTY for the hearing/speech impaired)
- Mandarin Chinese Appointment Line/Cancellations
- 1-888-886-1398 (toll free)
Notifications
- Provider offers telehealth services.
My training, certifications and licensing
Medical school
University of Southern California School of MedicineBoard certification
Medical Oncology
American Board of Internal MedicineMedical training
Fellowship
Hematology / Oncology
Los Angeles County-Harbor-UC Los Angeles Medical CenterInternship
Internal Medicine
UC San Diego School of MedicineResidency
Internal Medicine
St. Mary Medical CenterJoined Permanente Medical Group
2003Active license information
License number
A61489License type
Physician and SurgeonLicense issuing state
CALIFORNIANational Provider Identifier (NPI)
1215085162Cultural Competency Training (CCT)
CompletedMy hospitals
All Kaiser Permanente physicians and podiatrists have admitting privileges or the ability to refer patients to our plan hospitals. Admitting privileges of other providers may vary by plan and facility. Contact your plan administrator for details.
Setting the standard: Measuring care quality in our hospitals(PDF)
To find a provider's office hours, search our facility directory.
The information in this online directory is updated periodically. The availability of physicians, hospitals, providers, and services may change. Information about a practitioner is provided to us by the practitioner or is obtained as part of the credentialing process. If you have questions, please call us at 1-800-464-4000 (toll free). For the hearing and speech impaired: 1-800-464-4000 (toll free) or TTY 711 (toll free). You can also call the Medical Board of California at 916-263-2382, or visit their website.
We want to speak to you in the language that you’re most comfortable with when you call or visit us. Qualified interpreter services, including sign language, are available at no cost, 24 hours a day, 7 days a week during all hours of operations at all points of contact. We do not encourage the use of family, friends or minors as interpreters. Only the services of interpreters and qualified staff are used to provide language assistance. These may include bilingual providers, staff, and healthcare interpreters. In-person, telephone, video, and alternative modes of communication are available. Learn more about interpreter services.
If you would like to report an error in provider or facility information, please contact us.
Medicare Members: To request a hard copy of Kaiser Permanente’s provider directory, please call our Member Services department at 1-800-443-0815, seven days a week, 8 a.m. to 8 p.m. Kaiser Permanente will mail a hard copy of the provider directory to you within three (3) business days of your request. Kaiser Permanente may ask whether your request for a hard copy is a one-time request or if you are requesting to receive the provider directory in hard copy permanently.
If you request it, your request for hard copies of the provider directory remains until you leave Kaiser Permanente or request that hard copies be discontinued.
Medi-Cal Members: This directory includes Kaiser Permanente’s outpatient pharmacies. You can get any drugs covered by Kaiser Permanente at one of these pharmacies. You can get outpatient drugs covered by Medi-Cal at any Medi-Cal Rx Pharmacy. It does not have to be a Kaiser Permanente network pharmacy. Most Kaiser Permanente network pharmacies are Medi-Cal Rx pharmacies. Your pharmacy can tell you if it is part of the Medi-Cal Rx network. If you want to find a Medi-Cal pharmacy outside of Kaiser Permanente, you can use the Medi-Cal Rx Pharmacy Locator online at www.Medi-CalRx.dhcs.ca.gov. You can also call Medi-Cal Rx Customer Service at 1-800-977-2273, 24 hours a day, 7 days a week (TTY 711 Monday through Friday, 8 a.m. to 5 p.m.).
Medi-Cal Members: Enhanced Care Management and Community Supports services require prior authorization and are limited to members who meet specific eligibility criteria.
Kaiser Permanente enrollees have full and equal access to covered services, including enrollees with disabilities as required under the Federal Americans with Disabilities Act of 1990 and Section 504 of the Rehabilitation Act of 1973.
Kaiser Permanente uses the same quality, member experience, or cost-related measures to select practitioners and facilities in Marketplace Silver-tier plans as it does for all other Kaiser Foundation Health Plan (KFHP) products and lines of business. The measures may include, but are not limited to, HEDIS/CAHPS performance, member/patient complaints, patient safety scores, hospital quality measures, and geographic need. Members enrolled in KFHP Marketplace plans have access to all professional, institutional and ancillary health care providers who participate in KFHP plans’ contracted provider network, in accordance with the terms of members’ KFHP plan of coverage. All Kaiser Permanente Medical Group physicians and network physicians are subject to the same quality review processes and certifications.
Kaiser Permanente uses the same geographic distribution consideration to select hospitals in Marketplace plans as it does for all other Kaiser Foundation Health Plan (KFHP) products and lines of business. Accessibility of medical offices and medical centers in this directory: All Kaiser Permanente facilities are accessible to members.
This page was last updated on: 04/22/2026