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