Learn More About Me
Specialties: Colon And Rectal Surgery, General Surgery
Languages: French, German, English
About me
Marcus Oosenbrug, MD, FRCSC, is a double-board-certified colorectal surgeon at MedStar Georgetown University Hospital, where he provides advanced surgical care for patients with benign and malignant diseases of the colon, rectum, and anus.
Dr. Oosenbrug treats the full spectrum of colorectal conditions, including colorectal cancer, inflammatory bowel disease (Crohn’s disease and ulcerative colitis), and diverticulitis; anorectal conditions, in particular hemorrhoids, fissures, fistulas, and anal dysplasia; and pelvic floor disorders such as rectal prolapse and fecal incontinence. Trained in minimally invasive techniques, including laparoscopic and robotic approaches, he strives to help patients recover more quickly and with less pain, while preserving normal function whenever possible.
Dr. Oosenbrug's clinical interests include complex inflammatory bowel disease and sphincter-preserving procedures such as J-pouch surgery. He is also passionate about LGBTQ+ health, and the early detection and treatment of anal dysplasia using high-resolution anoscopy (HRA), a proven method for reducing the risk of anal cancer in vulnerable populations. He is also trained in sacral nerve stimulation therapy (MedTronic Interstim™) for fecal incontinence.
Originally from Canada, Dr. Oosenbrug completed his medical degree at McGill University in Montreal and general surgery residency at the University of Toronto. Before joining MedStar Health, he completed a fellowship in Colon & Rectal Surgery, as well as an additional year of further advanced surgical training in minimally invasive and complex reoperative colorectal surgery at the Cleveland Clinic in Florida.
A strong advocate for patient-centered care, he is dedicated to fostering an inclusive, affirming, and respectful environment for all patients and works closely with multidisciplinary teams of gastroenterologists, oncologists, and gynecologists to deliver comprehensive, coordinated care.
Having adopted Washington, D.C. as his home, he enjoys traveling, exploring new restaurants, and discovering everything the diverse capital city has to offer.
Philosophy of Care
“I strive to treat every patient with the same honesty, compassion, and attention I would give my own family. Trust and continuity of care are essential in my field, and I want patients to know that I’m here to support them throughout their entire healing journey. I see myself as an advocate for my patients, and my goal is to create a welcoming environment where people from all walks of life can feel heard, supported, and empowered to make informed decisions about their care.”
Clinical areas of focus
- Abdomen, Lower Back, Pelvis, And Genital Open Wound
- Abdominal Pain
- Anoscopy With Biopsy
- Anus And Rectum Diseases
- Colon Cancer
- Crohn's Disease
- Crohn's Disease [Regional Enteritis]
- Functional Intestinal Disorders
- Gastrointestinal Bleeding
- Hemorrhoids
- Ulcerative Colitis
Conditions and procedures
Conditions I treat
- Abdomen, Lower Back, Pelvis, And Genital Open Wound
- Abdominal Pain
- Abnormal Digestive Findings
- Anal Abscess
- Anal Bleeding
- Anal Cancer
- Anal Itching (PRURITUS ANI)
- Anal Warts (CONDYLOMA)
- Anorectal Fissure
- Anus And Rectum Diseases
- Artificial Openings Complications
- Bladder Disorders
- Bowel Obstruction
- Carcinoma In Situ Of Digestive Organs
- Carcinoma In Situ Of The Rectum
- Chronic Constipation
- Chronic Diarrhea
- Colitis
- Colon Cancer
- Colon Polyps
- Colon Stricture
- Colonic Diverticulosis
- Colonic Polyps
- Colorectal Malignancy
- Colorectal Stricture
- Congenital Malformations Of Intestine
- Crohn's Disease
- Crohn's Disease [Regional Enteritis]
- Diverticulitis
- Enteritis
- External Hemorrhoids
- Familial Polyposis
- Female Genital Tract Fistulae
- Functional Bowel Disorder
- Functional Intestinal Disorders
- Gastrointestinal Bleeding
- Hemorrhoid Prolapse
- Hemorrhoids
- Hemorrhoids And Perianal Venous Thrombosis
- Intestinal Perforation
- Paracolostomy Hernia
- Pilonidal Cyst
- Proctal Ulcer
- Proctitis
- Pruritus
- Rectal Cancer
- Rectal Fissure
- Rectal Pain
- Rectal Ulcers
- Sigmoiditis
- Ulcerative Colitis
- Ventral Hernia
Procedures I perform
- Abdominoperineal Resection
- Anal Cancer Treatment
- Anoscopy With Biopsy
- Colectomy
- Colon Cancer Surgery
- Colon Cancer Treatment
- Colostomy
- Colostomy Revision
- Crohn's Disease Surgery
- Diverticulosis Treatment
- Endorectal Advancement Flap
- Endoscopic Mucosal Resection
- Endoscopic Submucosal Dissection
- Gastrointestinal Cancer Treatment
- Gastrointestinal Foreign Body Removal
- Gastrointestinal Perforation Repair
- Gracilis Muscle Flap
- Hemorrhoidectomy
- Ileostomy
- Inferior Mesenteric Artery Aneurysm Repair
- Irritable Bowel Syndrome Treatment
- J-Pouch Surgery
- Laparoscopic Colectomy
- Lateral Internal Sphincterotomy
- Loop Colostomy
- Low Anterior Resection
- Open Colectomy
- Ostomy Care
- Perineal Rectosigmoidectomy
- Pilonidal Abscess Treatment
- Pilonidal Cyst Treatment
- Rectal Abscess Drainage
- Rectal Cancer Surgery
- Rectal Cancer Treatment
- Rectal Foreign Body Removal
- Rectal Pain Treatment
- Rectal Resection
- Rectal Stricture Dilation
- Sigmoid Colectomy
- Small Bowel Resection
- Stoma Care
- Stoma Revision
- Thiersch Procedure
- Ulcerative Proctitis Treatment
- Volvulus Treatment
Insurance
MedStar Health accepts most major health insurance plans. If you are uncertain as to whether your individual health insurance plan is accepted at MedStar Health, please call your insurance company.
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List of insurance plans we accept
- United Healthcare Select Plus (POS)
- IH-POS Plus
- Great-West Healthcare POS/CIGNA
- Cigna TotalCare (HMO D-SNP)
- Optimum Choice
- UnitedHealthcare Medicare Advantage DSNP District of Columbia
- Private Health Care Systems (PPO)
- M.D. IPA (HMO)
- WellPoint Maryland - Maryland Health Choice
- MD IPA (HMO) & MD IPA Preferred Cardiac Global
- Anthem BCBS of VA HealthKeepers (HMO)
- Anthem BCBS Medi Blue SNP
- UnitedHealthcare and AARP Medicare Complete Plans
- HumanaChoice PPO
- MedStar Family Choice - Maryland Health Choice
- UnitedHealthcare Individual Exchange Plans
- United Healthcare Choice Plus Cardiac Global
- AMERIVANTAGE/Amerigroup Community Care
- Kaiser Permanente Medicare Advantage Signature and Select
- Erickson Advantage Plans
- Kaiser Permanente Select
- Kaiser Maryland Medicaid MCO
- Lasso Healthcare - Medicare Medical Savings Account
- Network OA
- IH-HMO
- CareFirst Federal Employee Program (Std. & Basic PPO)
- CIGNA HMO Open Access
- Geisinger Medicare Advantage
- CIGNA Connect EPO
- UHC Group Medicare Advantage Plans (HMO, POS, PPO)
- HUMANA/Choice Care Medicare Plans (Choice, Gold Choice)
- Jai Medical Systems - Maryland Health Choice
- Anthem Federal Employee Program Standard
- Private Fee-for-Service Plans (PFFS)
- TriWest Healthcare Alliance
- Aetna Managed Choice Open Access (POS)
- Kaiser Permanente HMO Plus and DHMO Plus Member
- Aetna Classic 5000PD
- IH-Open Network Only Plus
- BlueChoice Open Access
- Kaiser Permanente Select Cardiac Global
- Aetna Student Health Insurance
- Anthem BCBS Medi Blue Dual Adv
- NYC Medicare Advantage Plus
- AmeriHealth Caritas DC Healthcare Alliance
- CareFirst Group Medicare Advantage
- UHC Passport
- Humana Medicare Advantage - HMO Open Access
- Aetna Quality Point of Service (POS)
- Options PPO Cardiac Global
- Aetna Advantage 5750
- Aetna Advantage 6350PD
- POS OA
- Aetna Signature Administrator PPO/TPA
- CIGNA PPO Plus
- Aetna Worker's Compensation Network
- CareFirst Group Medicare Advantage prescription drug benefit (PPO)
- Cigna Alliance Medicare (HMO)
- Navigate
- CareFirst MedStar PPO
- Kaiser Permanente Select - Added Choice
- United HealthCare Community Plan - Maryland Health Choice Program
- United Healthcare Select HMO-EPO/NPP Cardiac Global
- Medicare Direct
- Mamsi Life & Health (Indem./PPO) Cardiac Global
- AmeriHealth Caritas DC Healthy Families
- Priority Partners - Maryland Health Choice
- Aetna Classic 5000
- IH-Open POS Plus
- First Health PPO
- Tricare Reserve Select
- Fee-for-Service (FFS) District of Columbia, Maryland and Virginia Medicaid
- DC/MD SHOP QHP Small Business Plans
- Kaiser Permanente Medicare Plus
- Cigna Preferred Medicare (HMO)
- Coventry of Delaware HMO/PPO
- CareFirst EPO
- Choice POS II
- Medicare Advantage - Advantra Value (PPO)
- TRICARE for Life East
- IH-Open EPO Plus
- Mamsi Life & Health (Indem./PPO)
- CareFirst BlueCross BlueShield Advantage Core/Enhanced
- Aetna HMO
- CareFirst (NCA) Indemnity
- Amerigroup DC Alliance
- CIGNA HMO & Network (HMO)
- Humana Medicare Advantage - PPO
- HumanaChoice Honor's plan PPO
- United Healthcare Choice Plus
- Kaiser Permanente Signature - Added Choice
- IH-Open HMO Option
- Humana Gold Plus HMO
- Maryland Physicians Care MCO
- Choice POS II Open Access
- M.D. IPA Preferred (POS)
- BCBS Out-of-State Medicare Plans (Blue Advantage)
- Aetna HMO-Open Access/Select OA/HealthFund/Health Network Option OA
- Aetna Traditional Choice (PPO)
- Aetna Medicare Advantage HMO & PPO Plans
- United Healthcare Choice Cardiac Global
- CareFirst Blue Card Program
- Cigna Achieve Medicare (HMO C-SNP)
- Anthem Federal Employee Program Basic
- Aetna Basic
- Anthem BCBS of VA HealthKeepers Plus
- Johns Hopkins Advantage MD HMO
- CareFirst Dual Prime HMO-SNP
- United Healthcare Community Plan - VA Medicaid MCO
- Optimum Choice & Optimum Choice Preferred (POS) Cardiac Global
- Select HMO/HealthFund/Health Network
- Anthem BCBS of VA HealthKeepers (POS & POS OA)
- Choice Fund PPO
- TRICARE East Prime
- Optimum Choice Preferred (POS)
- Alterwood Advanatge HMO & DSNP Plans
- United Healthcare Navigate Cardiac Global
- Aetna Elect Choice/ Open Access (POS)
- Core Essential (HMO)
- IH-EPO Plus
- CIGNA EPO
- Uniformed Services Family Health Plan
- United Student Resources
- OCI Direct (HMO)
- Veterans Affairs Community Care Network
- IH-Network Only Plus
- CareFirst Maryland Indemnity or PPO
- Cigna True Choice Medicare (PPO)
- Blue Choice Advantage
- Coventry Health Care National Network PPO
- Coventry Health Care of Virginia
- United Healthcare Select HMO - EPO/NPP
- IH-POS
- CIGNA SureFit (HMO)
- IH-PPO
- United Healthcare Options (PPO)
- UnitedHealthcare Medicare Adv. Special Needs Plans
- HighMark
- Choice POS
- Aetna Premier 200PD
- Police and Fire Clinic
- Aetna Open Choice (PPO)
- IH-Indemnity
- Aetna VA Exchange
- Advantra Platinum (PPO)
- MedStar Family Choice DC Healthcare Alliance
- United Medicare Private Fee-for-Service (PFFS) plans
- CareFirst Blue Choice Opt Out Plus Open Access (POS)
- CareFirst NASCO
- Choice Care Network/HUMANA (PPO)
- CareFirst FEP Blue Focus
- Cigna True Choice Plus Medicare (PPO)
- Health Services for Children with Special Needs
- Kaiser Permanente Signature
- Aetna Classic 3500
- CareFirst MedStar Select PPO
- Johns Hopkins Advantage MD PPO
- Aetna Better Health of MD
- Amerigroup DC Healthy Families
- OA Plus
- Magellan Complete Care of VA - VA Medicaid MCO
- Beech Street PPO
- CareFirst BlueChoice HMO
- CareFirst Maryland Point of Service Plan
- CareFirst Administrators
- Kaiser Permanente Flexible Choice 3-tier POS
- IH-Open POS II
- HealthyBlue PPO
- MultiPlan, Inc
- CareFirst Blue Choice Opt Out Open Access
- Johns Hopkins Advantage MD PLUS PPO
- CareFirst Community Health Plan of MD
- MedStar Family Choice DC Healthy Families
- CIGNA PPO
- Healthy Blue (HMO, POS)
- Employee Health Plan
- Kaiser Permanente Flexible Choice POS Cardiac Global
- Aetna Advantage 6350
- Aetna Managed Choice (POS)
- Aetna Elect Choice/ EPO (Aetna Health Fund)
- Anthem BCBS Medi Blue Plus
- CIGNA Indemnity
- Sentara Health
- CareFirst Blue Preferred PPO
- TRICARE East Select
- United Healthcare Choice
- Kaiser Permaenete Signature - Added Choice Cardiac Global
- CIGNA POS/Network POS
- First Health PPO
- Medicare FFS
- IH-Open HMO
- BCBS of Michigan (BCN Advantage,Security Blue, Freedom, Medicare PLUS Blue Group PPO)
- Aetna Better Health of VA
- Anthem BCBS of VA Key Care POS/PPO/Indemnity
- Optima Family Care MCO - VA Medicaid MCO
- Aetna Medicare Advantage PFFS Plan
Videos
Education
Board Certification: American Board of Surgery, General Surgery
Fellowship: Cleveland Clinic Florida-Weston GME (2024)
Residency: University of Toronto (2023)
Medical School: McGill University (2018)