Mark Mahan, DO

Reported procedures

• Dr. Mahan performs a range of bariatric procedures designed to support significant and long-term weight loss. His surgical expertise includes sleeve gastrectomy Source ↗
• laparoscopic gastric bypass surgery Source ↗
• adjustable gastric banding Source ↗
• gastric restrictive procedures with partial gastrectomy or jejunojejunostomy Source ↗
• and revision of gastric anastomosis or restrictive procedures. He also provides comprehensive bariatric surgery for the treatment of obesity. Source ↗
• Sleeve gastrectomy Source ↗
• Gastric bypass Source ↗
• Revisional bariatric surgery Source ↗
• Bariatric surgery Source ↗

Source-reported information; confirm current details directly.

Reported credentials

• American Board of Surgery Source ↗
• Board Certified in General Surgery Source ↗
• Surgery Source ↗

Source-reported information; confirm current details directly.

Reported affiliations

• GEISINGER CLINIC Source ↗

Source-reported information; confirm current details directly.

Selected publications

• Too old to operate? Retrospective outcomes of laparoscopic paraesophageal hernia repair in nonagenarians. · 2026 Source ↗
• Opioid-sparing multimodal pain regimen in combination with intraoperative transversus abdominis plane block reduces opioid use after laparoscopic paraesophageal hernia repair. · 2026 Source ↗
• Roux-en-Y gastric bypass results in long-term durable weight loss and diabetes remission: a single center, > 15 year outcomes. · 2026 Source ↗
• The longitudinal inefficiency of robotic bariatric surgery: can we finally agree we are over the learning curve and robotic bariatric surgery just takes longer? · 2026 Source ↗
• Trends in first assistant in bariatric surgery: a 5 year analysis. · 2025 Source ↗
• Paraesophageal hernia repair combined with Roux-en-Y gastric bypass reduces short-term hernia recurrence with added metabolic benefit in patients with BMI ≥ 35: A 15-year experience. · 2025 Source ↗
• Robotic approach does not eliminate first assistant in bariatric surgery compared to laparoscopy. · 2025 Source ↗
• Robotics, money and research: is data or physician payments driving robotic bariatric surgery literature? · 2025 Source ↗
• Ambulatory discharge of patients undergoing sleeve gastrectomy results in significantly more adverse outcomes. · 2024 Source ↗
• Examining emergency department utilization following bariatric surgery. · 2024 Source ↗
• Rectal Trauma · 2023 Source ↗
• Is Robotic Revisional Bariatric Surgery Justified? An MBSAQIP Analysis. · 2022 Source ↗
• Pregnancy Trauma · 2022 Source ↗
• Emergency department overutilization following cholecystectomy and inguinal hernia repair. · 2021 Source ↗
• A rare case of spontaneous splenic rupture complicated by hemophilia A. · 2019 Source ↗
• Equivalent Peri-Operative Outcomes for Laparoscopic Roux-En-Y Gastric Bypass Patients Discharged on Post-Operative Day One. · 2019 Source ↗
• First assistant impact on early morbidity and mortality in bariatric surgery. · 2019 Source ↗

Source-reported information; confirm current details directly.

Professional identifier

NPI: 1841730496

Insurance reported

Aetna

Blue Cross Blue Shield

Cigna

UnitedHealthcare

Reported in source records. Confirm the exact plan, network and procedure with the practice and insurer. Logos identify brands; they do not establish participation.