Obstetrics and Gynecology (156 William Street, 7th Floor)
156 William Street
7th Floor
New York, NY 10038
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Locations and Appointments
Insurances Accepted
Before your appointment, please contact the doctor's office or your insurance provider to verify that your insurance is accepted. This list of insurances can change, and the insurance plans listed may not be accepted at all office locations for this provider.
AETNA
Aetna - NYP
Amida Care
Anthem Blue Cross Blue Shield
Anthem Blue Cross/Blue Shield
CIGNA
EmblemHealth
Fidelis Care
GHI
Health Insurance Plan of NY (HIP)
Healthfirst
Healthspring
Local 1199
Molina Healthcare
Oxford Health Plans
Quality Health Management (QHM)
Rockefeller University/Luminare
United Healthcare
UnitedHealthcare
VNS Health
WellCare
WorldWide Medical
Dr. Ryan E. Longman is an Associate Clinical Professor and Vice Chair of Obstetrics and Gynecology at NewYork-Presbyterian / Weill Cornell Medicine Center and Chief of Obstetrics and Gynecology at NYP Lower Manhattan Hospital. He specializes in maternal-fetal imaging, pelvic ultrasound, and women's health genetics.
Dr. Longman provides advanced prenatal and gynecologic ultrasound care for women with high-risk pregnancies. His clinical expertise includes early fetal anatomy evaluation, prenatal diagnostic procedures such as amniocentesis and chorionic villus sampling, noninvasive prenatal genetic testing, and comprehensive genetic screening. He has special experience caring for women...
Expertise
- Abnormal Prenatal Diagnosis
- Chorionic Villus Sampling
- Connective Tissue Disease
- Ehlers-Danlos Syndrome
- Maternal-Fetal Ultrasound
- Pelvic Ultrasound
Titles & Positions
- Associate Attending Obstetrician and Gynecologist
- Associate Professor of Clinical Obstetrics and Gynecology (Pending Appointment at Rank)
Titles & Positions
- Associate Attending Obstetrician and Gynecologist
- Associate Professor of Clinical Obstetrics and Gynecology (Pending Appointment at Rank)
In the News
NewYork-Presbyterian hospital taps UChicago leader as OB-GYN chief
Becker's Hospital Review•January 15, 2026
Research
Interventions and Perinatal Outcomes Associated With Recipient Twin Cardiomyopathy in the Setting of Twin-To-Twin Transfusion Syndrome: A Systematic Review.
April 05, 2026Predicting Postpartum Hemorrhage Using Clinical Features Extracted With Large Language Models.
October 16, 2025Transvaginal shear wave elastography for measuring uterine myometrial and leiomyoma stiffness: a protocol pilot study.
September 09, 2025