Why Gastroenterologists Get Sued: Perforation, Interval Colon Cancer, and the ERCP That Wasn't Indicated

By John Mahoney · June 2026 · 9 min read

Gastroenterology is a procedural specialty wearing a cognitive specialty's risk profile. Most claims arise from something that happened during a scope — a perforation, a sedation event, a bleed — but the highest-severity claims arise from something that did not happen: a cancer that was missed, or a lesion the colonoscopy walked right past. Understanding which kind of case you are holding, and which kind the defense will fight hardest, is the first step in valuing a GI matter correctly.

This guide is for plaintiff and defense med-mal attorneys screening gastroenterology claims. It covers the frequency-and-severity reality, the procedural-versus-diagnostic allegation split, the cannot-miss conditions that drive payouts, the contributing factors that make a claim payable, and what separates a strong GI case from a weak one.

Disclaimer: This article is for informational purposes only and does not constitute legal advice or a medical opinion. Closed-claims and registry figures span different insurers and eras and are not strictly comparable across sources. Always evaluate the specific record and retain a qualified expert before acting.

The Frequency-and-Severity Reality

By frequency, gastroenterology sits in the middle of the pack. The Jena et al. analysis (NEJM 2011) places it in the moderate band — roughly 9–10% of gastroenterologists facing a claim each year, well below high-risk surgical specialties but well above the lowest-risk fields. Among internal-medicine subspecialties, GI runs high: paid-claims data (Schaffer/Studdert, JAMA Intern Med, 1992–2014) put it at 15.8 paid claims per 1,000 physician-years, second-highest of the IM subspecialties and far above general internal medicine. More than 10% of practicing gastroenterologists face a claim, and they spend a meaningful share of their careers with an open one.

Severity runs medium-to-high, and it is rising. In a 1985–2008 endoscopy closed-claims study, over 98% of claims involved physical injury, roughly 25.8% resulted in death, and about 40.7% in significant or major disability. Mean indemnity varies sharply by procedure: ERCP is the most expensive (reported around $376,000), followed by colonoscopy (around $250,000), EGD, and flexible sigmoidoscopy. The overall GI mean paid claim rose materially across the study window — a statistically significant increase of roughly 41% — with delayed-cancer-diagnosis and ERCP claims driving the top end.

For case valuation, the lesson is that GI is bimodal: a large volume of moderate procedural injuries, plus a smaller set of catastrophic missed-cancer and ERCP claims that carry the dollars. Triage to that distribution.

The Dominant Allegation Types

GI claims break cleanly along the procedural/diagnostic axis:

• Improper performance of a procedure — the largest category, roughly 51–54% of GI and endoscopy closed claims in the PIAA and 1985–2008 studies. These are the technical-injury cases: perforation, a difficult or failed cannulation, operator-dependent endoscopy quality.
• Diagnostic error — failure or delay in diagnosis — roughly 17–24% of claims. Critically, of these diagnostic-error claims, around 59–61% involve a missed or delayed cancer, and of those, roughly 69% are colorectal. This is the small bucket that drives the big numbers.
• Failure to supervise or monitor the patient, including sedation monitoring — around 5%.
• Procedure not indicated or contraindicated — around 4%, with ERCP performed without a clear indication a recurring theme.
• Failure to recognize or treat a complication promptly, plus informed-consent deficiencies frequently pled alongside the primary allegation.

On intake, route the case first: is this a technical-injury claim or a missed-diagnosis claim? The merit logic, the expert, and the realistic value all follow from that fork.

The Cannot-Miss Conditions and Failures

A defined set of fact patterns drives GI severity. Screen for these on both sides:

• Colonoscopic or endoscopic perforation — the single most common direct injury. In the iatrogenic-injury claims, roughly 95% involve perforation or direct GI-tract injury, and colonoscopy alone accounts for about 52% of procedure claims and the largest claim-and-indemnity category.
• Missed or delayed colorectal cancer — including interval (post-colonoscopy) cancer. This is the highest-severity diagnostic driver. It is tied to endoscopy quality: a low adenoma detection rate, a missed flat or right-colon lesion, premature exam termination. Reported adenoma miss rates run roughly 20–25%, and post-colonoscopy colorectal cancer represents an estimated 2–8% of colorectal cancers. A patient diagnosed with cancer shortly after a "normal" colonoscopy is a recognizable high-merit pattern.
• ERCP complications and ERCP performed without proper indication — post-ERCP pancreatitis, perforation, cholangitis. ERCP carries the highest mean payment of any GI procedure and one of the fastest-rising claim rates. When an ERCP was done without a documented therapeutic indication and a complication followed, the case is materially stronger.
• Sedation/anesthesia complications — aspiration, hypoxia, cardiopulmonary arrest from inadequate peri-procedural monitoring.
• Post-polypectomy or post-biopsy bleeding, often tied to mismanaged peri-procedural anti-thrombotic therapy.
• Missed upper-GI or esophageal/gastric malignancy on EGD, and failure to follow up abnormal findings such as Barrett's esophagus, iron-deficiency anemia, or a positive FIT/FOBT.

Contributing Factors: Where Cases Are Actually Won and Lost

The allegation states the theory; the contributing factors decide whether it gets paid. In GI, the recurring drivers are:

• Technical skill and procedural performance. Perforation, incomplete or failed cannulation, and operator-dependent endoscopy quality drive the plurality of claims — the majority of the procedural bucket.
• Clinical judgment and diagnostic process. Failure to develop a differential, order or interpret the right test, or pursue an abnormality. This is the engine of the cancer-related diagnostic claims — missed lesions, a low adenoma detection rate, premature exam termination.
• Failure of follow-up and care coordination. Abnormal results, surveillance intervals, and biopsy/pathology results not tracked to closure. Closing the loop on results is repeatedly the single most actionable systemic fix — and its absence is among the strongest plaintiff merit signals.
• Communication and indication. Inadequate disclosure of risk and of the procedure's indication, especially for ERCP, where consent is often the only proof that the risk was disclosed at all.
• Documentation. Weak informed-consent and procedure documentation undermines defensibility. As across most specialties, this is a defensibility lever, not usually a liability one — thin records do not cause the injury but heavily predict whether the claim is paid.
• Procedure indication and selection. Endoscopy performed on questionable indication is cited in up to roughly a third of procedures, and a clear majority of gastroenterologists in survey data report performing additional invasive procedures without a clear indication — fertile ground for a "not indicated" theory.

What Separates a Strong Case From a Weak One

Both sides converge on the same question: was the bad outcome a recognized risk competently managed, or a negligent act? In GI, three sub-questions decide it.

Was it a known complication, or a quality failure?

Perforation is a recognized risk of competent endoscopy. The strong perforation case is not "a perforation happened" — it is a perforation that was negligently caused or, more often, negligently recognized late. The defensible one is a known complication, disclosed in consent, recognized and managed promptly. Map the timeline from injury to recognition to intervention; that sequence usually decides the case.

For a cancer case, was the endoscopy adequate and the loop closed?

An interval-cancer claim lives or dies on endoscopy quality and follow-up. Was the cecum reached and documented? Was withdrawal time and prep quality adequate? Was the adenoma detection rate within accepted norms? And were the pathology result, the abnormal finding, and the surveillance interval tracked to closure? A documented closed loop is a strong defense; a lost result is strong plaintiff leverage. A clean causation chain — linking the missed lesion or quality failure to the eventual cancer outcome — is what a viable missed-cancer case must build.

Was the ERCP indicated?

ERCP is the highest-payout GI procedure, and the indication question is its weak point. A complication after an ERCP with a clear, documented therapeutic indication is defensible. The same complication after an ERCP that should have started with MRCP or EUS — performed without documented therapeutic intent — is a much stronger plaintiff case.

And will the expert and the damages hold up?

Because GI pairs a technical theory with a diagnostic one, the specialty-match and reliability questions that govern the certificate of merit feed directly into a later Daubert and FRE 702 challenge. Pressure-test the opinion for both at once. And given GI's bimodal severity, run the realistic damages picture early — our damages calculator helps frame exposure so a routine perforation is not valued like a missed-cancer death, and vice versa.

Bottom Line

Gastroenterology is a procedural specialty with a diagnostic tail, and the tail carries the money. Most claims are technical — perforation, sedation events, bleeds — but the catastrophic ones are missed colorectal cancers and ERCP injuries. The cases turn on three questions: was a complication a known risk competently and promptly managed; for cancer claims, was the endoscopy adequate and the result tracked to closure; and was the ERCP actually indicated. Score procedure indication, endoscopy quality, and closed-loop follow-up heavily, and you will value a GI case correctly from either side of the docket.

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