Mark T. Birns, MD in Baltimore: Board-Certified Gastroenterology with Hospital-Affiliated Scope
Mark T. Birns is a board-certified gastroenterologist with American College of Gastroenterology credentials (FACG, FACP, AGAF) who practices in Baltimore and treats both common and complex digestive conditions. His practice spans screening colonoscopies, inflammatory bowel disease, hepatology, and therapeutic endoscopy across multiple office locations, with hospital privileges at major Baltimore systems.
What Birns' practice actually is
Birns operates as an independent gastroenterology practice with office locations throughout the Baltimore region. His credentials (American College of Gastroenterology Fellow, American College of Physicians Fellow, American Gastroenterological Association Fellow) signal depth in general gastroenterology and advanced diagnostics, not subspecialty-only work. He accepts new patients and participates in most major insurance plans, a critical detail because many gastroenterologists in Baltimore have closed practices or limited network participation since 2020.
Services and what you might pay
Birns' practice handles preventive colonoscopy, upper endoscopy, flexible sigmoidoscopy, Barrett's esophagus surveillance, celiac disease evaluation, and management of Crohn's disease and ulcerative colitis. The practice also offers hepatology consultation for fatty liver disease and fibrosis staging.
Colonoscopy cost through most Baltimore insurers (Medicare, Aetna, Cigna, UnitedHealth) ranges from $0 copay to $250 depending on findings and whether biopsy occurs; verify with your insurer because out-of-network costs run $2,000 to $3,500. Upper endoscopy carries similar tiers. Office visits for new patients typically cost $150 to $250 as a copay; existing-patient follow-ups run $30 to $100. Confirm current copay and coinsurance amounts with his office, as these shift with plan changes.
The practice performs procedures in affiliated ambulatory surgery centers, not hospital operating rooms, which typically lowers patient out-of-pocket exposure but may affect sedation options on a case-by-case basis.
How Birns compares to Baltimore's gastroenterology landscape
Baltimore has relatively concentrated gastroenterology capacity. Johns Hopkins' division of gastroenterology operates a large clinic with shorter new-patient wait times (often 2 to 4 weeks) but often requires Hopkins primary-care referral and operates on an academic schedule that limits evening access. University of Maryland Medical Center gastroenterology similarly serves as a major referral hub with stronger availability for complex IBD and hepatology cases, though wait times can exceed 6 weeks.
Birns' practice sits in the middle tier: fewer specialists per location than academic centers, but typically shorter wait times (2 to 3 weeks for screening colonoscopies), and private-practice flexibility around scheduling evening and Saturday procedures. The tradeoff is that complex cases (end-stage liver disease, refractory IBD on biologic therapy, pancreatitis complications) often route to Johns Hopkins or UMD regardless. Choose Birns for straightforward preventive and intermediate-complexity care; choose Hopkins or UMD if you have established academic-center relationships or require multidisciplinary oncology or transplant coordination.
Who Birns suits and who it does not
This practice is well-matched to adults seeking preventive colonoscopy screening, celiac disease or GERD diagnostic work, and stable inflammatory bowel disease follow-up. New patients from most Baltimore neighborhoods can obtain appointments within reasonable timelines, and insurance network participation is broad.
It is poorly matched to pediatric patients (Birns does not treat minors), patients seeking cosmetic or bariatric pre-surgical clearance (referral-heavy specialties he may not front-load), and those with acute severe illness (bleeding, perforation) requiring immediate hospital-based endoscopy.
What your first visit involves
New patients complete a standard intake form with medication and allergy history; allow 15 minutes before your appointment for this step. Birns typically spends 25 to 35 minutes on the initial visit doing a symptom history, abdominal exam, and family-history screen. If colonoscopy or endoscopy is planned, scheduling happens at that visit and is usually available within 2 to 4 weeks; you receive printed prep instructions and sedation consent forms by mail. Bring your insurance card and photo ID; many insurers require prior authorization for screening colonoscopies, which the office staff will file on your behalf, though you should verify your plan covers the procedure at the time you call to confirm your appointment.
Hours, parking, and logistics
Birns maintains office locations in Harbor East and Towson; verify the location of your appointment when you call, as some patients confuse them. Harbor East location is served by paid street parking and a garage one block away ($15 to $20 daily). Towson location has a dedicated lot with free patient parking. Office hours are Monday through Friday 8:30 a.m. to 4:30 p.m.; weekend and evening appointments are not available. Procedures are scheduled at affiliated surgery centers in Towson and Canton, both accessible by car from central Baltimore in 15 to 25 minutes depending on traffic.
Birns' practice demonstrates the depth and accessibility most Baltimore patients expect from intermediate-tier gastroenterology, with real scheduling advantages over academic centers for routine preventive care and a specialty focus broad enough to handle most chronic conditions without constant referral.
