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Meet Our Multidisciplinary Endometriosis Surgical Team in Los Angeles

Raanan Meyer, MD

Available for virtual consults

Director, Comprehensive Endometriosis Center Minimally Invasive Gynecologic Surgeon (MIGS)
Dr. Raanan Meyer leads the Institute’s gynecologic surgical program. He completed a three-year fellowship in Minimally Invasive Gynecologic Surgery (MIGS) at Cedars-Sinai Medical Center in Los Angeles, where he trained extensively in advanced laparoscopic and robotic techniques. His practice focuses on the full surgical spectrum of endometriosis—from precision excision of deeply infiltrating disease to complex procedures requiring multidisciplinary coordination.
Dr. Meyer’s approach is meticulous and patient-centred: preserve healthy tissue and organ function whenever possible, remove disease thoroughly, and design recovery for a safe and steady return to life.
Clinical focus
  • Advanced excision of endometriosis, including deeply infiltrating endometriosis (DIE)
  • Complex myomectomy (multiple/large fibroids) with fertility-sparing technique
  • Complex hysterectomy (large uteri, severe adhesions)
  • Hysteroscopic surgery (removal of fibroids, septa, polyps, adhesions)
Training
  • MIGS Fellowship (3 years), Cedars-Sinai Medical Center, Los Angeles
  • Extensive experience in laparoscopic and robotic gynecologic surgery
Philosophy of care
Clarity, precision, and collaboration. Dr. Meyer partners closely with colorectal and urologic colleagues when disease involves the bowel, bladder, or ureters, so patients have one surgical plan and one coordinated recovery.

Moshe Barnajian, MD

Available for virtual consults

Double Board-Certified in General and Colorectal Surgery Leader in Minimally Invasive & Robotic Surgery
Dr. Moshe Barnajian is a board-certified colorectal surgeon known for comprehensive, compassionate care and expertise in minimally invasive techniques. He earned his medical degree from Drexel University College of Medicine, completed general surgery residency at Cedars-Sinai Medical Center, and pursued additional colorectal training at Stony Brook University Hospital.
In the endometriosis setting, Dr. Barnajian’s role is pivotal when disease involves the rectum, sigmoid colon, or anal canal. He performs laparoscopic and robotic resections and advanced anorectal procedures, helping restore bowel function while coordinating closely with our gynecologic team.
Clinical focus
  • Bowel endometriosis: shaving, discoid resection, segmental resection (as indicated)
  • Minimally invasive colorectal surgery (laparoscopic and robotic)
  • Colorectal cancer, diverticulitis, inflammatory bowel disease
  • Complex anorectal conditions (fissures, fistula, hemorrhoids, pilonidal disease; HIV-related anorectal disorders)
Training
  • MD, Drexel University College of Medicine
  • General Surgery Residency, Cedars-Sinai Medical Center
  • Colorectal Surgery training, Stony Brook University Hospital
  • Board-Certified Colorectal Surgeon
Philosophy of care
Evidence-based, minimally invasive whenever feasible, and coordinated with gynecology to minimize recurrence and preserve continence and function.

Yosef Nasseri, MD, FACS, FASCRS

Available for virtual consults

Double Board-Certified in General and Colorectal Surgery Leader in Minimally Invasive & Robotic Surgery
Dr. Yosef Nasseri is a nationally recognized colorectal surgeon and an early leader in advanced minimally invasive and robotic techniques. Based at the Cedars-Sinai Medical Towers and West Hollywood, he provides concierge-style access for patients with complex lower digestive tract disease, including Crohn’s disease, diverticulitis, and colorectal cancer—as well as bowel endometriosis requiring precision resection.
Dr. Nasseri is a seasoned educator and proctor in robotic surgery, training surgeons internationally on state-of-the-art techniques. He is widely published, serves on multiple national surgical committees, and has been elected by his peers to the Board of Governors of the American College of Surgeons. He is also an Associate Professor of Surgery at Cedars-Sinai.
Clinical focus
  • Minimally invasive and robotic colorectal surgery (including bowel endometriosis)
  • Complex pelvic surgery with nerve-sparing technique when feasible
  • Advanced management of diverticulitis, Crohn’s disease, and colorectal cancer
Leadership & academic service (selected)
  • Education and international training in robotic colorectal surgery
  • Committee roles: American Society of Colon and Rectal Surgeons; American College of Surgeons; SAGES; Southwestern Surgical Congress; Consortium for Optimizing the Treatment of Rectal Anal Cancer
  • Board of Governors, American College of Surgeons (elected by peers)
  • Associate Professor of Surgery, Cedars-Sinai Medical Center
  • Author of numerous peer-reviewed publications and book chapters
Philosophy of care
Use the least invasive approach that achieves a complete operation, protect function, and anchor the plan in a cohesive, multi-specialty strategy.

How We Work - One Plan, One Team

  • Multidisciplinary planning: Gynecologic and colorectal surgeons review imaging and examine patients together when bowel or urinary tract involvement is suspected.
  • Coordinated surgery: When indicated, procedures are performed in the same session—one anesthesia, one recovery—reducing delays and repeat operations.
  • Function-preserving technique: Our shared goal is complete disease removal while protecting nerves and healthy tissue whenever possible.
  • Continuity of care: Clear post-operative pathways, coordinated follow-up, and communication back to referring clinicians.
If you’re facing complex endometriosis—pelvic, bowel, bladder, or diaphragm—our team is ready to design a plan that is thorough, coordinated, and centered on preserving your quality of life.