Learn More About Me
Specialties: Colon And Rectal Surgery, General Surgery
Languages: German, English, French
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
- Aetna Classic 5000
- Aetna Open Choice (PPO)
- Aetna Managed Choice (POS)
- Cigna Preferred Medicare (HMO)
- Cigna TotalCare (HMO D-SNP)
- First Health PPO
- Blue Choice Advantage
- Coventry of Delaware HMO/PPO
- Core Essential (HMO)
- United Healthcare Choice Plus
- Aetna Student Health Insurance
- Anthem BCBS of VA HealthKeepers (HMO)
- Priority Partners - Maryland Health Choice
- Geisinger Medicare Advantage
- Kaiser Permanente Select Cardiac Global
- Aetna Managed Choice Open Access (POS)
- HumanaChoice Honor's plan PPO
- United Healthcare Select HMO - EPO/NPP
- Choice POS II
- Humana Medicare Advantage - PPO
- HealthyBlue PPO
- Erickson Advantage Plans
- IH-HMO
- Johns Hopkins Advantage MD PPO
- Options PPO Cardiac Global
- Optima Family Care MCO - VA Medicaid MCO
- Great-West Healthcare POS/CIGNA
- CareFirst Group Medicare Advantage
- POS OA
- HUMANA/Choice Care Medicare Plans (Choice, Gold Choice)
- DC/MD SHOP QHP Small Business Plans
- IH-POS Plus
- IH-Open HMO
- Choice POS II Open Access
- CareFirst EPO
- CareFirst MedStar Select PPO
- Navigate
- Aetna Elect Choice/ EPO (Aetna Health Fund)
- Medicare Direct
- CareFirst FEP Blue Focus
- Medicare FFS
- IH-Open EPO Plus
- CareFirst Community Health Plan of MD
- MultiPlan, Inc
- Cigna Achieve Medicare (HMO C-SNP)
- Cigna True Choice Plus Medicare (PPO)
- MedStar Family Choice DC Healthcare Alliance
- Mamsi Life & Health (Indem./PPO) Cardiac Global
- MD IPA (HMO) & MD IPA Preferred Cardiac Global
- Kaiser Permaenete Signature - Added Choice Cardiac Global
- Maryland Physicians Care MCO
- UHC Passport
- Network OA
- Choice Fund PPO
- Cigna True Choice Medicare (PPO)
- Aetna Worker's Compensation Network
- United Healthcare Select HMO-EPO/NPP Cardiac Global
- Aetna Advantage 6350PD
- Anthem BCBS of VA HealthKeepers Plus
- Amerigroup DC Alliance
- BlueChoice Open Access
- CIGNA SureFit (HMO)
- Magellan Complete Care of VA - VA Medicaid MCO
- Kaiser Permanente Medicare Advantage Signature and Select
- Aetna Advantage 6350
- United Medicare Private Fee-for-Service (PFFS) plans
- TriWest Healthcare Alliance
- CIGNA Indemnity
- Kaiser Permanente Select - Added Choice
- UnitedHealthcare and AARP Medicare Complete Plans
- Aetna Quality Point of Service (POS)
- Anthem BCBS of VA Key Care POS/PPO/Indemnity
- Healthy Blue (HMO, POS)
- Choice Care Network/HUMANA (PPO)
- Sentara Health
- TRICARE East Select
- CareFirst Maryland Point of Service Plan
- Uniformed Services Family Health Plan
- Police and Fire Clinic
- Optimum Choice & Optimum Choice Preferred (POS) Cardiac Global
- CareFirst Administrators
- United HealthCare Community Plan - Maryland Health Choice Program
- IH-EPO Plus
- IH-Open POS Plus
- AmeriHealth Caritas DC Healthcare Alliance
- Optimum Choice
- NYC Medicare Advantage Plus
- CareFirst Maryland Indemnity or PPO
- Coventry Health Care of Virginia
- WellPoint Maryland - Maryland Health Choice
- OA Plus
- Aetna Better Health of VA
- CareFirst BlueChoice HMO
- Coventry Health Care National Network PPO
- UnitedHealthcare Medicare Advantage DSNP District of Columbia
- IH-Open HMO Option
- BCBS Out-of-State Medicare Plans (Blue Advantage)
- Anthem BCBS Medi Blue Plus
- UnitedHealthcare Individual Exchange Plans
- IH-Open Network Only Plus
- Aetna VA Exchange
- First Health PPO
- Aetna Advantage 5750
- Aetna HMO
- Anthem BCBS of VA HealthKeepers (POS & POS OA)
- Private Health Care Systems (PPO)
- Employee Health Plan
- Select HMO/HealthFund/Health Network
- CareFirst Blue Card Program
- Aetna HMO-Open Access/Select OA/HealthFund/Health Network Option OA
- United Healthcare Choice Plus Cardiac Global
- HighMark
- CIGNA Connect EPO
- Jai Medical Systems - Maryland Health Choice
- Optimum Choice Preferred (POS)
- IH-Open POS II
- CIGNA EPO
- Anthem BCBS Medi Blue SNP
- IH-Network Only Plus
- IH-POS
- CareFirst Blue Choice Opt Out Open Access
- Cigna Alliance Medicare (HMO)
- United Healthcare Select Plus (POS)
- United Healthcare Navigate Cardiac Global
- Medicare Advantage - Advantra Value (PPO)
- CareFirst (NCA) Indemnity
- United Healthcare Community Plan - VA Medicaid MCO
- Kaiser Permanente Flexible Choice 3-tier POS
- United Healthcare Choice Cardiac Global
- AmeriHealth Caritas DC Healthy Families
- Health Services for Children with Special Needs
- CareFirst BlueCross BlueShield Advantage Core/Enhanced
- HumanaChoice PPO
- Kaiser Permanente Signature - Added Choice
- CIGNA POS/Network POS
- Anthem BCBS Medi Blue Dual Adv
- Advantra Platinum (PPO)
- Humana Gold Plus HMO
- Kaiser Permanente Flexible Choice POS Cardiac Global
- Private Fee-for-Service Plans (PFFS)
- CareFirst Dual Prime HMO-SNP
- Anthem Federal Employee Program Standard
- Tricare Reserve Select
- MedStar Family Choice - Maryland Health Choice
- MedStar Family Choice DC Healthy Families
- Lasso Healthcare - Medicare Medical Savings Account
- CareFirst MedStar PPO
- TRICARE East Prime
- United Healthcare Options (PPO)
- CareFirst Group Medicare Advantage prescription drug benefit (PPO)
- Kaiser Permanente Signature
- BCBS of Michigan (BCN Advantage,Security Blue, Freedom, Medicare PLUS Blue Group PPO)
- Aetna Signature Administrator PPO/TPA
- CareFirst NASCO
- Kaiser Permanente Select
- M.D. IPA (HMO)
- Aetna Elect Choice/ Open Access (POS)
- CareFirst Blue Preferred PPO
- Kaiser Permanente Medicare Plus
- Amerigroup DC Healthy Families
- Fee-for-Service (FFS) District of Columbia, Maryland and Virginia Medicaid
- AMERIVANTAGE/Amerigroup Community Care
- IH-Indemnity
- Aetna Better Health of MD
- CIGNA PPO
- IH-PPO
- CIGNA PPO Plus
- Choice POS
- CareFirst Federal Employee Program (Std. & Basic PPO)
- TRICARE for Life East
- United Student Resources
- UHC Group Medicare Advantage Plans (HMO, POS, PPO)
- Johns Hopkins Advantage MD PLUS PPO
- CIGNA HMO Open Access
- Anthem Federal Employee Program Basic
- Aetna Basic
- CIGNA HMO & Network (HMO)
- Mamsi Life & Health (Indem./PPO)
- Kaiser Maryland Medicaid MCO
- Kaiser Permanente HMO Plus and DHMO Plus Member
- Johns Hopkins Advantage MD HMO
- M.D. IPA Preferred (POS)
- Aetna Classic 3500
- Veterans Affairs Community Care Network
- Aetna Traditional Choice (PPO)
- CareFirst Blue Choice Opt Out Plus Open Access (POS)
- Alterwood Advanatge HMO & DSNP Plans
- Aetna Medicare Advantage PFFS Plan
- UnitedHealthcare Medicare Adv. Special Needs Plans
- Aetna Medicare Advantage HMO & PPO Plans
- United Healthcare Choice
- Aetna Premier 200PD
- Beech Street PPO
- OCI Direct (HMO)
- Aetna Classic 5000PD
- Humana Medicare Advantage - HMO Open Access
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)