Learn More About Me
Specialties: Colon And Rectal Surgery, General Surgery
Languages: English, French, German
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
Practice locations
Distance from Change Location Enter your Location
3800 Reservoir Rd NW
4th Fl
Washington, DC, 20007
106 Irving St NW
Ste 2100
Washington, DC, 20010
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
- IH-HMO
- Aetna Worker's Compensation Network
- Jai Medical Systems - Maryland Health Choice
- Optimum Choice
- Kaiser Permanente HMO Plus and DHMO Plus Member
- United Healthcare Choice
- CareFirst Federal Employee Program (Std. & Basic PPO)
- HealthyBlue PPO
- CareFirst Maryland Indemnity or PPO
- Blue Choice Advantage
- Cigna Achieve Medicare (HMO C-SNP)
- Employee Health Plan
- United Medicare Private Fee-for-Service (PFFS) plans
- United Healthcare Navigate Cardiac Global
- Kaiser Permanente Signature
- Mamsi Life & Health (Indem./PPO)
- United HealthCare Community Plan - Maryland Health Choice Program
- Anthem BCBS of VA Key Care POS/PPO/Indemnity
- Aetna Elect Choice/ EPO (Aetna Health Fund)
- OA Plus
- TRICARE for Life East
- Choice Care Network/HUMANA (PPO)
- CIGNA HMO Open Access
- MultiPlan, Inc
- BCBS Out-of-State Medicare Plans (Blue Advantage)
- Advantra Platinum (PPO)
- Humana Gold Plus HMO
- CareFirst Blue Card Program
- Anthem BCBS of VA HealthKeepers (POS & POS OA)
- MedStar Family Choice - Maryland Health Choice
- IH-Network Only Plus
- HumanaChoice Honor's plan PPO
- Coventry of Delaware HMO/PPO
- Kaiser Permanente Select
- Medicare Direct
- IH-EPO Plus
- CareFirst FEP Blue Focus
- DC/MD SHOP QHP Small Business Plans
- Aetna HMO-Open Access/Select OA/HealthFund/Health Network Option OA
- Aetna Managed Choice Open Access (POS)
- CIGNA PPO Plus
- Fee-for-Service (FFS) District of Columbia, Maryland and Virginia Medicaid
- Anthem BCBS Medi Blue SNP
- Kaiser Permanente Medicare Advantage Signature and Select
- United Student Resources
- Aetna Medicare Advantage PFFS Plan
- HumanaChoice PPO
- Alterwood Advanatge HMO & DSNP Plans
- Aetna Classic 5000PD
- Beech Street PPO
- Network OA
- United Healthcare Choice Plus Cardiac Global
- Aetna Better Health of MD
- Humana Medicare Advantage - HMO Open Access
- IH-POS
- CareFirst MedStar PPO
- United Healthcare Select HMO-EPO/NPP Cardiac Global
- Johns Hopkins Advantage MD HMO
- Anthem BCBS of VA HealthKeepers Plus
- IH-PPO
- Coventry Health Care National Network PPO
- Anthem Federal Employee Program Standard
- CIGNA POS/Network POS
- Aetna Medicare Advantage HMO & PPO Plans
- CIGNA Connect EPO
- Cigna Preferred Medicare (HMO)
- Coventry Health Care of Virginia
- Mamsi Life & Health (Indem./PPO) Cardiac Global
- OCI Direct (HMO)
- IH-Open HMO Option
- Choice POS II
- United Healthcare Select HMO - EPO/NPP
- UnitedHealthcare Individual Exchange Plans
- Aetna Signature Administrator PPO/TPA
- M.D. IPA Preferred (POS)
- CareFirst EPO
- Cigna True Choice Plus Medicare (PPO)
- Priority Partners - Maryland Health Choice
- Aetna Traditional Choice (PPO)
- Optimum Choice & Optimum Choice Preferred (POS) Cardiac Global
- IH-Open POS Plus
- Optima Family Care MCO - VA Medicaid MCO
- Tricare Reserve Select
- BCBS of Michigan (BCN Advantage,Security Blue, Freedom, Medicare PLUS Blue Group PPO)
- Core Essential (HMO)
- United Healthcare Choice Plus
- Medicare Advantage - Advantra Value (PPO)
- Aetna Managed Choice (POS)
- First Health PPO
- Kaiser Permanente Signature - Added Choice
- United Healthcare Select Plus (POS)
- Kaiser Permaenete Signature - Added Choice Cardiac Global
- Aetna Advantage 6350PD
- Aetna Better Health of VA
- IH-Open EPO Plus
- Aetna VA Exchange
- AMERIVANTAGE/Amerigroup Community Care
- Uniformed Services Family Health Plan
- Erickson Advantage Plans
- UnitedHealthcare Medicare Adv. Special Needs Plans
- Anthem BCBS Medi Blue Plus
- CareFirst (NCA) Indemnity
- Aetna Student Health Insurance
- IH-POS Plus
- Magellan Complete Care of VA - VA Medicaid MCO
- NYC Medicare Advantage Plus
- Kaiser Permanente Flexible Choice 3-tier POS
- United Healthcare Community Plan - VA Medicaid MCO
- CareFirst Dual Prime HMO-SNP
- UHC Group Medicare Advantage Plans (HMO, POS, PPO)
- Amerigroup DC Alliance
- Aetna HMO
- Select HMO/HealthFund/Health Network
- Choice Fund PPO
- Lasso Healthcare - Medicare Medical Savings Account
- IH-Open POS II
- UnitedHealthcare and AARP Medicare Complete Plans
- CareFirst MedStar Select PPO
- CareFirst Group Medicare Advantage prescription drug benefit (PPO)
- Navigate
- CareFirst Blue Preferred PPO
- Sentara Health
- Anthem BCBS Medi Blue Dual Adv
- CareFirst Community Health Plan of MD
- Choice POS
- CIGNA SureFit (HMO)
- CIGNA EPO
- Cigna True Choice Medicare (PPO)
- Maryland Physicians Care MCO
- HUMANA/Choice Care Medicare Plans (Choice, Gold Choice)
- United Healthcare Choice Cardiac Global
- Aetna Open Choice (PPO)
- Health Services for Children with Special Needs
- UHC Passport
- Medicare FFS
- First Health PPO
- TriWest Healthcare Alliance
- Anthem BCBS of VA HealthKeepers (HMO)
- HighMark
- CIGNA PPO
- CIGNA HMO & Network (HMO)
- Kaiser Permanente Flexible Choice POS Cardiac Global
- Cigna TotalCare (HMO D-SNP)
- Cigna Alliance Medicare (HMO)
- Great-West Healthcare POS/CIGNA
- TRICARE East Prime
- M.D. IPA (HMO)
- POS OA
- Johns Hopkins Advantage MD PPO
- MD IPA (HMO) & MD IPA Preferred Cardiac Global
- IH-Open Network Only Plus
- CareFirst Maryland Point of Service Plan
- United Healthcare Options (PPO)
- Aetna Basic
- MedStar Family Choice DC Healthcare Alliance
- CareFirst BlueCross BlueShield Advantage Core/Enhanced
- IH-Open HMO
- CareFirst NASCO
- CareFirst Administrators
- AmeriHealth Caritas DC Healthcare Alliance
- CareFirst BlueChoice HMO
- CareFirst Blue Choice Opt Out Plus Open Access (POS)
- Kaiser Permanente Select - Added Choice
- UnitedHealthcare Medicare Advantage DSNP District of Columbia
- CIGNA Indemnity
- TRICARE East Select
- Humana Medicare Advantage - PPO
- Choice POS II Open Access
- Johns Hopkins Advantage MD PLUS PPO
- Aetna Quality Point of Service (POS)
- Amerigroup DC Healthy Families
- Healthy Blue (HMO, POS)
- Private Health Care Systems (PPO)
- Aetna Advantage 5750
- Kaiser Maryland Medicaid MCO
- MedStar Family Choice DC Healthy Families
- Options PPO Cardiac Global
- Anthem Federal Employee Program Basic
- BlueChoice Open Access
- CareFirst Blue Choice Opt Out Open Access
- Kaiser Permanente Medicare Plus
- Kaiser Permanente Select Cardiac Global
- AmeriHealth Caritas DC Healthy Families
- WellPoint Maryland - Maryland Health Choice
- Private Fee-for-Service Plans (PFFS)
- Aetna Advantage 6350
- Veterans Affairs Community Care Network
- Aetna Premier 200PD
- Optimum Choice Preferred (POS)
- IH-Indemnity
- Aetna Classic 3500
- Police and Fire Clinic
- Geisinger Medicare Advantage
- Aetna Elect Choice/ Open Access (POS)
- CareFirst Group Medicare Advantage
- Aetna Classic 5000
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)