Hajoon Chun, MD

About

Over 10,000 patients a year, and more than 600 amniocenteses. That is Dr. Hajoon Chun’s practice volume at Flushing Hospital Medical Center, where he has been director of maternal-fetal medicine since 2001. He is not the physician who runs your IVF cycle. He is the one you are referred to once there is a pregnancy that needs closer watching than a fertility clinic can provide.

Chun earned his medical degree at Tufts University School of Medicine in 1991, trained in obstetrics and gynecology at New York Downtown Hospital, and completed his maternal-fetal medicine fellowship at Mount Sinai Medical Center. He is certified by the ABOG in obstetrics and gynecology with a maternal-fetal medicine subspecialty, and is a Fellow of ACOG. Beyond the clinic he takes part in obstetrics and gynecology residency teaching, and he is an affiliated physician with Northwell Health.

GFG lists him on its physician page as its collaborating maternal-fetal medicine specialist, alongside Dr. Melvin Thornton II and Dr. Amir Mor. For patients building a family through donor eggs, surrogacy or PGT, he is the perinatal side of that team: prenatal diagnosis, counseling on what a test result means, and the procedure room when a definitive sample is needed. He sees patients in English and Korean.

Clinical Expertise

• Maternal-fetal medicine: the obstetric subspecialty for pregnancies with medical or fetal complications; he directs such a division at Flushing Hospital Medical Center
• High-risk pregnancy management: co-managing a pregnancy that carries more risk than routine prenatal care handles
• Prenatal diagnosis and counseling: testing and interpretation, with the conversation that follows a result
• Amniocentesis: over 600 a year, the single most concrete number attached to his practice
• Complex obstetrics: named as a focus in his profile; our record does not enumerate which conditions he covers, so ask whether your specific case falls in his scope

Why Choose Dr. Hajoon Chun

Volume you can count. Over 10,000 patients and 600-plus amniocenteses annually — a subspecialist whose judgment is informed by an unusually large sample.

Twenty-five years running a division. He has directed maternal-fetal medicine at Flushing Hospital Medical Center since 2001, so the referral pathway inside that hospital runs through him.

Fellowship training at Mount Sinai, ABOG subspecialty certification. Certified in obstetrics and gynecology with maternal-fetal medicine, Fellow of ACOG, affiliated with Northwell Health’s network.

Korean-language care. He consults in English and Korean, which is a real advantage for Korean-speaking patients in the New York area, and GFG also staffs a Korean IVF coordinator.

He is on GFG’s physician page. Fertility patients usually have to find a perinatologist on their own after a positive test; here the referral is already named before the cycle starts.

Professional Affiliations

Certified by the American Board of Obstetrics and Gynecology in obstetrics and gynecology and in the maternal-fetal medicine subspecialty; Fellow of the American College of Obstetricians and Gynecologists (FACOG). Education: Tufts University School of Medicine (1991), residency at New York Downtown Hospital, maternal-fetal medicine fellowship at Mount Sinai Medical Center. Director of maternal-fetal medicine at Flushing Hospital Medical Center since 2001, affiliated physician with Northwell Health, and long-standing participant in obstetrics and gynecology residency teaching. Our data record lists ACOG and ASRM membership; ASRM is a reproductive medicine society and we could not confirm his membership of it in the research file.

Suitable For

A pregnancy that started with help and needs watching. Donor egg pregnancies and pregnancies after an embryo transfer are the cases fertility patients most often hand to a perinatologist. High-risk management, prenatal diagnosis and counseling sit in Chun’s listed scope.

Prenatal diagnosis and the decisions around it. He performs amniocentesis at volume and specializes in counseling families through results — relevant after PGT, where an embryo screen does not replace prenatal testing.

Twins or more. Multiple gestations appear in our record of the high-risk conditions he manages, alongside gestational diabetes and hypertension.

Patients who want consultation in Korean. English and Korean, with a Korean IVF coordinator at the referring clinic.