Specializing In
- Anemia
- Anticoagulation
- Antiphospholipid Syndrome
- Autoimmune Hemolytic Anemia
- Bleeding Disorders
- Clotting Disorders
- Cytopenias
- Hemochromatosis
- Hemoglobinopathies
- Immune Thrombocytopenia
- Iron Deficiency
Biography
Dr. Diep is a board-certified, fellowship-trained hematologist with Stanford’s Hematology Program and Hematologic Cancer Program. He is also a clinical assistant professor with the Department of Medicine, Division of Hematology.
He diagnoses and treats patients with a wide range of nonmalignant hematology conditions. His special interests include clotting disorders, bleeding disorders, hemoglobinopathies, and disorders affecting blood count. Subspecialty interests include anticoagulation and thrombosis.
Dr. Diep’s practice style emphasizes shared decision-making by building patient-physician relationships and using the best available evidence to create treatment plans. He is passionate about improving care for patients with blood disorders and has helped expand access to hematology care by launching an electronic consult service for primary care providers.
Dr. Diep’s research interests include anticoagulation, thrombosis, and bleeding disorders. He has participated in research projects that have received funding from the National Heart, Lung, and Blood Institute.
Dr. Diep has published in multiple peer-reviewed journals, and has presented to his peers at national and regional meetings.
He is a member of the American Society of Hematology, American Society of Clinical Oncology, Hemostasis and Thrombosis Research Society, International Society of Hemostasis and Thrombosis, and Anticoagulation Forum. Dr. Diep serves as quality director for the Division of Hematology.
He diagnoses and treats patients with a wide range of nonmalignant hematology conditions. His special interests include clotting disorders, bleeding disorders, hemoglobinopathies, and disorders affecting blood count. Subspecialty interests include anticoagulation and thrombosis.
Dr. Diep’s practice style emphasizes shared decision-making by building patient-physician relationships and using the best available evidence to create treatment plans. He is passionate about improving care for patients with blood disorders and has helped expand access to hematology care by launching an electronic consult service for primary care providers.
Dr. Diep’s research interests include anticoagulation, thrombosis, and bleeding disorders. He has participated in research projects that have received funding from the National Heart, Lung, and Blood Institute.
Dr. Diep has published in multiple peer-reviewed journals, and has presented to his peers at national and regional meetings.
He is a member of the American Society of Hematology, American Society of Clinical Oncology, Hemostasis and Thrombosis Research Society, International Society of Hemostasis and Thrombosis, and Anticoagulation Forum. Dr. Diep serves as quality director for the Division of Hematology.
View Full Biography
Professional Summary
Education & Certifications
- Board Certification: American Board of Internal Medicine, Medical Oncology (2021)
- Residency: Duke University School of Medicine (2018) NC
- Board Certification: American Board of Internal Medicine, Hematology (2021)
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- Fellowship: University of Washington Hem/Onc Fellowship Pgm (2021) WA
- Board Certification: American Board of Internal Medicine, Internal Medicine (2018)
- Medical Education: Stony Brook University School of Medicine (2015) NY
Honors & Awards
- Alpha Omega Alpha, Renaissance School of Medicine at Stony Brook University (2015)
- Gold Humanism Honor Society, Renaissance School of Medicine at Stony Brook University (2015)
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Memberships
- Panel Member, Cancer-Associated Venous Thromboembolic Disease Guideline Committee, National Comprehensive Cancer Network (2023 - Present)
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Administrative Appointments
- Associate Program Director, Hematology/Oncology Fellowship (2024 - Present)
- Quality Improvement Director, Division of Hematology, Department of Medicine (2021 - Present)
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Publications
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Should we monitor the direct oral anticoagulants?
Diep, R., & Garcia, D. (2020). Should we monitor the direct oral anticoagulants? Journal of Thrombosis and Thrombolysis, 50(1), 30–32. -
Does aspirin prevent venous thromboembolism?
Diep, R., & Garcia, D. (2020). Does aspirin prevent venous thromboembolism? Hematology. American Society of Hematology. Education Program, 2020(1), 634–641. -
A rare CALR variant mutation and a review of CALR in essential thrombocythemia.
Diep, R., & Metjian, A. (2018). A rare CALR variant mutation and a review of CALR in essential thrombocythemia. Journal of Thrombosis and Thrombolysis, 45(3), 457–462. -
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A novel nucleotide substitution in the 5' untranslated region of ANKRD26 gene is associated with inherited thrombocytopenia: a report of two new families.
Diep, R. T., Corey, K., & Arcasoy, M. O. (2019). A novel nucleotide substitution in the 5' untranslated region of ANKRD26 gene is associated with inherited thrombocytopenia: a report of two new families. Annals of Hematology, 98(7), 1789–1791. -
Pregnancy in patients with thrombocytopenia and absent radii (TAR) syndrome.
Diep, R. T., & Arcasoy, M. O. (2017). Pregnancy in patients with thrombocytopenia and absent radii (TAR) syndrome. Annals of Hematology, 96(9), 1589–1590. -
In COVID-19, therapeutic vs. prophylactic anticoagulation did not improve clinical outcomes and increased bleeding.
Diep, R., & Garcia, D. (2021). In COVID-19, therapeutic vs. prophylactic anticoagulation did not improve clinical outcomes and increased bleeding. Annals of Internal Medicine. -
Awareness of Chronic Kidney Disease and Depressive Symptoms: National Health and Nutrition Examination Surveys 2005-2010.
Shirazian, S., Diep, R., Jacobson, A. M., Grant, C. D., Mattana, J., & Calixte, R. (2016). Awareness of Chronic Kidney Disease and Depressive Symptoms: National Health and Nutrition Examination Surveys 2005-2010. American Journal of Nephrology, 44(1), 1–10. -
Cough and wheeze events are temporally associated with increased pain in individuals with sickle cell disease without asthma.
Diep, R. T., Busani, S., Simon, J., Punzalan, A., Skloot, G. S., & Glassberg, J. A. (2015). Cough and wheeze events are temporally associated with increased pain in individuals with sickle cell disease without asthma. British Journal of Haematology, 170(5), 732–4. -
Cancer-Associated Venous Thromboembolic Disease, Version 2.2024, NCCN Clinical Practice Guidelines in Oncology.
Streiff, M. B., Holmstrom, B., Angelini, D., Ashrani, A., Buckner, T., Diep, R., … Sliker, B. (2024). Cancer-Associated Venous Thromboembolic Disease, Version 2.2024, NCCN Clinical Practice Guidelines in Oncology. Journal of the National Comprehensive Cancer Network : JNCCN, 22(7), 483–506. -
MDM2 inhibition is associated with the emergence of TP53-altered clonal hematopoiesis.
Khanna, V., Eslami, G., Reyes, R., Diep, R., Fernandez-Pol, S., Stehr, H., … Chen, C. T. (2025). MDM2 inhibition is associated with the emergence of TP53-altered clonal hematopoiesis. NPJ Precision Oncology, 9(1), 34.
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A novel nucleotide substitution in the 5' untranslated region of ANKRD26 gene is associated with inherited thrombocytopenia: a report of two new families.
Clinical Trials
Clinical trials are research studies that evaluate a new medical approach, device, drug, or other treatment. As a Stanford Health Care patient, you may have access to the latest, advanced clinical trials.
Open trials refer to studies currently accepting participants. Closed trials are not currently enrolling, but may open in the future.
Practice Locations
Hematologic Cancer Program Palo Alto, CA
Palo Alto, CA
Hematologic Cancer Program
875 Blake Wilbur Dr
Palo Alto , CA 94304
Make An Appointment More Clinic Information Getting HereHereditary Hemorrhagic Telangiectasia Center of Excellence Stanford, CA
Stanford, CA
Hereditary Hemorrhagic Telangiectasia Center of Excellence
300 Pasteur Dr
Stanford , CA 94305
Make An Appointment More Clinic Information Getting HereImportant Information about Our Organizations and Physician Affiliation
Stanford Health Care, Stanford Health Care Tri-Valley, and Stanford Medicine Partners are each independent nonprofit organizations that are affiliated with but separate from each other and from Stanford University. The physicians who provide care at facilities operated by Stanford Health Care, Stanford Health Care Tri-Valley, and Stanford Medicine Partners are faculty, foundation, or community physicians who are not employees, representatives, or agents of Stanford Health Care, Stanford Health Care Tri- Valley, or Stanford Medicine Partners. Stanford Health Care, Stanford Health Care Tri-Valley, and Stanford Medicine Partners do not exercise control over the care provided by such faculty, foundation, and community physicians and are not responsible for their actions.
Patient Reviews
(127 reviews)
Dr Diep is a very knowledgeable specialist.
He is Caring, understanding, knowledgeable and professional. He Communicated his thoughts clearly.
Dr. Diep was extremely helpful to me in that he asked a lot of questions and seemed truly concerned what was happening in my health issue.
I felt he went above and beyond to get some answers or eliminate questions.
A great Dr. I am glad I had the opportunity to meet with him.
He listens well and offers testing when appropriate. He is confident in his approach to treat rare illnesses.
This was my first appointment with Dr Diep. I found him to be extremely knowledgeable, informative, and willing to answer all my questions.
Great doctor…very thorough, capable and compassionate
Dr, Diep is an excellent physician.
I am extremely grateful for him! He is the best.
Dr. Answered our questions…..explained his approach to my situation….made recommendations…..he was thoughtful and his remarks were helpful to me and my family.
Spoke to both a fellow who got my oral history and then Dr Diep
Thanks for your help.
He is wonderful,,concerned and very professional
He is very good doctor. He explains clearly about my condition.
Great visit, thank you for your services!
Great bedside manner
Excellent support
His explanations and instructions were clear and very helpful.
Dr. Diep is very professional, extremely knowledgeable, approachable, and personable. He explains things well and is also a good listener. I enjoy my appointments with Dr. Diep because I feel reassured by his thorough assessments and the detailed information he provides.
Appreciated his advice and expertise
Excellent! We received updated information about Alan's condition. The information was explained in a way we could understand and enables us to make better decisions.
Very pleased with Dr. Diep’s discussion and outlining of treatment alternatives for my medical condition and planning next steps for my preferred treatment.
Dr. Diep is very professional and caring. He is very kind and thorough.
Dr Diep is an informative expert doctor
I appreciate the time that Dr. Diep took to listen to and address my questions. He understands the complications and challenges of my rare blood disease and respects my medical decisions.
Dr. Diep gave me a more complete understanding of my current low white blood cell condition which helped to lower my concerns and anxiety.
Doctor Diep is a an excellent doctor. He’s very thorough and highly educated. I appreciate him most because my case is extremely complicated and rare, the fact that he’s willing to help and reach out to other colleagues is impressive. I feel I can trust him because he isn’t just dropping me off as a patient due to all the complications. He is going the extra mile, which shows he cares.
It’s a pleasure to talk with Dr. Diep, he is very knowledgeable and understanding.
Extremely through and knowledgeable!
He's great at communicating complicated medical information in a way I can understand. He's patient with questions.
Dr. Diep was well prepared for our video visit and remembered specifically areas of concern I had expressed during my last office visit.
I am so grateful to be under Dr. Diep's thoughtful care.
Just want to thank him for his excellent care.
Dr. Diep provided me with the information I needed.
Extremely capable
I thought he was super helpful and explained everything very well.
Exceptional Dr. in every way. Professional, patient, caring, kind, humble, respectful and thoughtful.
He great doctor
He is excellent at explaining the medical issues, test results, and process going forward, as well as answering questions.
Thank you!
Being in the care of Dr Diep gives me assurance. He is always very thorough with me. Doesn’t push treatments on me and allows me to take my time when deciding on course of treatment to do next. I also appreciate the reminders of when labs are due for our upcoming visits. Overall, very pleased and happy with his care and all the team behind him.
Dr. Diep is extremely professional, and demonstrates that he cares and completely understands my individual needs.
Fantastic! Thorough, empathetic, and addressed all questions
Dr. Diep is an amazing doctor. Has made me feel comfortable and heard since day 1. He’s always on top of my health and communication is great.
Thank you.
The Doctor took plenty of time to ask me questions and answered my questions and concerns. Dr. Diep has a pleasant and professional personality. I’m grateful to. Have him for my doctor.
Good guy.. knowledgeable and compassionate
Dr Diep was very thorough in his explanations and took the time to answer my questions.
Dr Diep was exceptional. He was very thorough and explained everything quite well. I sincerely appreciate his support.
He explained everything to me so I could understand what he was looking for
Dr. Diep was very informative and answered my questions professionally and helpful.
Dr Robert Diep is professional, thorough, clear, and easy to communicate with. I feel very confident during the visit.
He was very patient and helpful
Dr. Diep and his resident, Dr. Xu are very thorough in their explanations to me. Both of them are very knowledgeable and super nice. I feel very lucky to have them as my treating physicians.
Great bedside manner. Explains it all.
Dr Diep is an extremely knowledgeable, personable and compassionate physician. He is always prepared and I feel as if he knows my medical history and has reviewed all relevant facts before the appointment. He allows me to express my concerns and seems to have an intuitive understanding of need for information and reassurance. His advice and recommendations are always spot on.
I am really pleased that Dr Malone assigned me to Dr Diep. I could not be more satisfied or pleased with Dr Diep’s care.
Stanford Healthcare has once again provided me with outstanding care.
Dr. Diep is excellent and very supportive. We feel very comfortable with him and trust him completely.
Extremely thorough!
Thank you for taking the time to explain and devise and discuss a plan moving forward!
Great Guy!
I appreciated Dr. Diep taking the time to thoughtfully answer all my questions. I also liked see the risk analysis spreadsheet he used during our visit.
he was very knowledgeable, compassionate , great bedside manner and spoke in laymen's term that I could understand.
Dr. Diep is thorough and understanding. He’s an excellent practitioner.
Excellent.
He is thorough and endeavors to be helpful. He is also young.
Thorough and intelligible.
I am lucky to have Dr. Diep as my hematologist. I have total confidence in him and I am comfortable talking to him. Thank you Dr. Diep.
Dr. Diep has been very helpful to me. He explains things in a professional but easy to understand way. He always is interested in me both as a person and a patient.
Dr Diep
Explained everything to me in detail. I did not feel he was rushed. He was very patient and took his time with me to make sure I was very clear about all options in front of me.
I felt like he was very intelligent, very prepared and thorough.
I would recommend him to anyone with a very strong recommendation.
One of the best doctor visits I have ever had
Thank you for being completely prepared.
I felt he was extremely thorough.
Dr Robert Diep is a professional with a calm and focussed manner.
I respect him.
I was extremly impressed with Dr. Diep. He quickly determined the primary area of concern . in my in my condition and offered a three different intelligent courses of action to better evaluate my problem.
I am very please with the plan we selected, and I am delighted to have Dr. Diep on my care team.
Dr Diep was extremely well prepared , professional, attentive and compassionate with knowing my health issues & providing information & recommendations for long term care . I particularly commend his skills in writing very detailed visit notes and offering to answer follow up questions on My health tool (which he did immediately & clearly ).
Knowledgeable and clear.
He’s great. Helpful, knowledgeable, bright, etc.
Robert Diep was extremely thoughtful and thorough and made me feel supported.
Dr. Diep is very knowledgeable and approachable. He reviewed my 98 pages of medical information forwarded to him and had a complete grasp of my rare blood disease.
He was very thorough, answered all of my questions (I'm the spouse of a patient with dementia), and summarized everything on the call and in his note. He also gave references. I was extremely satisfied with the visit.
Dr Diep was very thorough. I felt he explained things clearly. I did not feel that he was in a rush.
He’s thorough, informative
excellent Doctor
He is interested in my “case†and had done some investigation of why something had happened, so I am pleased that he has tried to figure out the situation. He very clearly explained what I should do if I were to have surgery, although he did not ask me to repeat it back to him. I believe he saw that I understood, and it would have been awkward if he’d asked me to repeat it to him.
He was wonderful
Excellent knowledgeable doctor
He's a thoughtful and caring physician.
Excellent and precise
Dr Diep was extremely informative and was well prepared. He answered all my questions and helped explain the parameters of my condition in a clear and concise manner. He did not rush, he took his time. He left me feeling I was in good hands and he would take good care of me whatever may arise in the future from my existing condition.
I feel extremely confident in him as my doctor guiding me through the next phase..
He is just great.
Dr. Diep is a remarkable practitioner and is someone who evokes trust and confidence. He is highly competent, considerate and clear in his communications. I feel as if he has reviewed and understands my history, both medical and personal, whether our last interaction was one week or six months prior. I always feel as if my quality of life and health are important to him.
Kudos to Stanford Hematology for recruiting and valuing such special, outstanding practitioner!
Dr. Diep was very thorough & well prepared for our video conference. He carefully explained treatment options and next steps to assess the need for further medical treatment.
Excellent provider. I am very happy with his ability to manage my medical problem.
He explains well, ask questions, answers questions, and it’s very pleasant
Thank you
Thank you, Dr. Diep.
Very informative. Very easy to speak with.
He’s very good in explaining about my condition.
excellent doctor
Dr. Diep explains the processes and medical terms to the patient in a comprehensive manner. He takes care of the time that is spent educating and informing me.
Clear, thorough
Really appreciate the time and care Dr. Diep has provided to make sure my iron levels are good and I'm staying on top of my health.
He is very understanding and helpful
He’s great. Personable and knowledgeable and helpful.
Dr. Diep explained everything thoroughly.
Thanks for your preparation
Excellent
Good and kind doctor
Thorough, very smart.
Nice doc
He has very good interpersonal skills, and is clearly a very competent physician.
A nice doctor
Clear and thorough
Dr. Robert Diep was extremely personable and pleasant to conversate with. He was knowledgeable about my case and about the issue(s) that I deal with. He made me feel at ease and was respectful of what I go through with my health. I felt like he had a great plan of action for continuing me on my journey to better health. I am glad he is my doctor and I am very pleased with the level of care I am given.
Very thoughtful and thorough
I was impressed. He was very familiar with my case.
Great doctor. Patient and complete with questions. Knowledgeable and reassuring.
Initial visit with Dr. Diep who replaced my previous Dr., Dr. Brar. Dr. Diep was well prepared regarding my history and carefully reviewed all prior issues and concerns, listening intently. His manner was very cordial, professional and caring. His concerns about my medical issues and well-being were clearly sincere and left me feeling confident that I am in good hands. I would highly recommend him to any prospective patients.
This time was my 1st time seen Dr.Diep & he also got to know about my health background
Dr Diep, made a complicated description of my medical issues very understandable and organized!
My plan of action is clear and I was always given the opportunity to ask questions or clarifications. Very pleased with the the medical history taken by Dr Diep and Dr Rasonoff(sp?) Fellow.
Dr. Diep was attentive and listened to my questions and concerns. He provided me with information and explanations on a course of treatment. He explained thoroughly the tests that he will order and why he is ordering them and the next steps. I'm glad that I was referred to Dr. Diep and am confident that he is an excellent physician.
Dr. Diep was very helpful…he explained away any concerns I have and gave good suggestions for keeping me in good health. He was very patient with me…and asked questions as though I was in the examination room. I am happy that he is my doctor.
All good.
Frist impression, that he is quite knowledgeable and I had an instant connection with him.
This was my first meeting with Robert Diep. He appears to have a genuine interest and concern for me and my medical symptoms and was reassuring that the current course of treatment is still appropriate for me. I believe his medical background and interests fit well with my medical concerns.
He was excellent. Clear. Detailed. No bullshit.
He was terrific! He listened and understood what I said and answered any questions thoroughly and carefully. I learned a lot from the visit. It was the first time meeting him and it was a pleasure to do so.
He was very helpful
Dr. Diep was very thorough and addressed all of my concerns.
He and his team have a nice "bedside" manner. Dr. Diep was thoughtful, very knowledgeable, invited my questions and answered them all.
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