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Tanya Siddiqi,

M.D.

Hematologist

4.9 (213 Ratings)
Biography photo
Location
City of Hope Orange County Lennar Foundation Cancer Center
1000 Five Point
Irvine, CA 92618
Specialties
Hematologic Oncology
Education
Medical school:
  • 2000, M.B.B.S., Aga Khan University Medical College, Karachi, Pakistan
Residency:
  • 2003-2006, Internal Medicine, University of Connecticut Health Center, Farmington, Connecticut
Academic Appointments
  • Medical Director, Lymphoma, City of Hope Orange County
  • Director, Chronic Lymphocytic Leukemia Program, Toni Stephenson Lymphoma Center
  • Professor, Division of Lymphoma, Department of Hematology & Hematopoietic Cell Transplantation
About Me

Tanya Siddiqi, M.D., is a highly respected hematologist-oncologist who focuses on treating blood cancers, with a particular expertise in chronic lymphocytic leukemia and B cell non-Hodgkin lymphoma. Dr. Siddiqi is also the director of the Chronic Lymphocytic Leukemia Program at the Toni Stephenson Lymphoma Center at City of Hope® Cancer Center Duarte. 

In addition to her clinical work, Dr. Siddiqi leads clinical research aimed at advancing treatment options for hematologic malignancies, including exploring leading-edge therapies like targeted treatments and CAR T cell therapy. 

Dr. Siddiqi received her medical degree from Aga Khan University Medical College in Karachi, Pakistan. She completed her residency in internal medicine at the University of Connecticut Health Center in Farmington, followed by advanced training in hematology and oncology at Beth Israel Deaconess Medical Center in Boston. She pursued a further specialization in stem cell transplantation at City of Hope. 

Dr. Siddiqi is an integral member of City of Hope’s Toni Stephenson Lymphoma Center, the Immunotherapy Disease Team, and the Gehr Family Center for Leukemia Research, where she continues to push the boundaries of what's possible in blood cancer treatment.

Patient reviews
The patient ratings and comments on this page are obtained from an external Press Ganey® outpatient survey provided to all eligible City of Hope patients within one to two weeks of their treatment occurrence. Raw data from the answers to the survey questions about our physicians are calculated by Press Ganey into a one- to five- star rating. In the spirit of transparency, all patient comments are posted as written by the patient, whether they are positive or negative. We only exclude comments if they are deemed to be slanderous or libelous, contain profanity or vulgar language, or do not relate to the patient's experience with the doctor involved. As a result, the comments are the views and opinions of the patients surveyed and are not endorsed by, and may not necessarily reflect the opinion of, City of Hope.
Apr 28, 2026
2.9
"I think doctor's need to listen better [...]"
Apr 24, 2026
5.0
"Dr. Siddiqi is great. I am very fortunate to have her take care of me"
Apr 21, 2026
5.0
"From the minute you walk in the Irvine facility, one is treated with courtesy, kindness & respect. I truly believe that by design that's when patient care begins."
Apr 21, 2026
5.0
"Dr Siddiqi IMO is the gold standard in patient/doctor interaction. Her ability to explain complicated topics to the patient in understandable terms eases the patients anxiety given the fact that one is in a cancer hospital"
Apr 3, 2026
5.0
"Dr. Siddiqi is the greatest. Very professional and always fully explains her results analysis."
Mar 21, 2026
3.1
"She did not examine my body. She had a mask on and only briefly came near me to listen to my heart. I had a leg full of bumps she never saw."
Mar 10, 2026
5.0
"Very professional, very courteous"
Mar 5, 2026
5.0
"Dr. Siddiqi is outstanding in every respect!"
Jan 30, 2026
5.0
"Good"
Jan 30, 2026
5.0
"Good"
Jan 27, 2026
5.0
"I have had the greatest experience being treated at COH by the staff and Dr. Siddiqi."
Jan 13, 2026
5.0
"Dr, Siddiqi is the best. I trust her, and she always addresses my concerns with care and respect and is always considerate of me as an ndividual and as a person, not just another patient."
Dec 27, 2025
5.0
"Great experience"
Dec 2, 2025
5.0
"Dr.Siddiqi a consistent and caring professional. One of the COH's treasures."
Nov 14, 2025
5.0
"I have recommended C of H to several friends and others. All have commented on the positive uplifting experience vs other places they've been to."
Nov 14, 2025
5.0
"I have recommended this provider to a friend who was being treated in another city recently, results with this provider were excellent. His family was absolutely delighted with this provider, C of H, and the entire experience. He is doing remarkably well after being in a very dire situation before. His brother is now a C of H patient as well."
Oct 31, 2025
5.0
"I have referred multiple people to see Dr Siddiqi. They have been able to get a timely appt and so appreciate the care she gave"
Oct 28, 2025
5.0
"We could recommend City Of hope to others [...]"
Oct 27, 2025
5.0
"Dr. Siddiqi and her team are awesome!"
Oct 24, 2025
5.0
"Right now my low grade lymphoma is thankfully pretty stable so our conversations are somewhat routine. I try to keep up on the evolution of emerging treatments so I can be ready to work with Dr Siddiqi when the day comes that I relapse.Dr Siddiqi is well recognized for her expertise in CLL and she is a vetted expert in Waldenstrom's per the IWMF and I would recommend her without hesitation."
Oct 10, 2025
3.7
"I was informed I had very low white cells; was not given any information what that meant; however, was directed to get my [...] doctor to follow up with a blood test."
Sep 4, 2025
3.7
"Dr. Siddiqi is very good and I have recommended her."
Aug 7, 2025
5.0
"That's great"
Aug 7, 2025
5.0
"They are spectacular people"
Aug 3, 2025
5.0
"This is an excellent practice and tops in the field of CLL"
Aug 3, 2025
5.0
"Dr. Siddiqi listens and explains in a very professional and friendly way. She never seems rushed but takes time with me as needed"
Jul 25, 2025
5.0
"Excellent provider"
Jul 25, 2025
5.0
"I would always recommend City of Hope and my provider and team"
Jul 4, 2025
5.0
"I have recommended her on a few occasions [...]"
Jun 24, 2025
4.4
"Will be meeting with Dr to discuss test results after tests are complete."