This guide, “Gastroenterology CPT Codes & Modifiers (2025 Guide)”, digs into what GI coders are seeing in real use this year: which CPT codes are being billed most often (like 43239 for EGD with biopsy, 45380 & 45385 for colonoscopy with biopsy/snare removal, and the rising usage of capsule endoscopy codes 91110/91113), and which codes are more likely to get flagged or denied. It explains how documentation details (e.g. location of biopsy, technique of lesion removal, scope type) and modifiers matter, and gives an overview of current payer pressures—bundling edits, pre-authorization demands, stricter scrutiny of op notes. It’s a valuable reference for those in GI coding aiming to stay ahead of denials and ensure compliance.

The “Gastroenterology CPT Codes & Modifiers (2025 Guide)” by AnnexMed provides an in-depth look at real-world coding practices in GI (gastroenterology), based on current data, payer behavior, and common challenges in claims. While CPT codes in GI may not shift drastically year to year, how they are used is changing significantly — more attention from payers on exact documentation, the use of proper modifiers, and adherence to bundling rules.

The blog outlines which CPT codes are dominating GI outpatient and hospital billing in 2025. For upper GI procedures, codes like 43239 (EGD with biopsy), 43235 (diagnostic EGD without biopsy), 43251 (EGD with snare removal), 43254 (EGD with mucosal resection), and 43266 (EGD with stent placement) are among the most frequent. In colonoscopy work, 45378, 45380, 45385, 45390, and 45398 stand out, depending on whether biopsies, snare removal, or band ligation are involved. Capsule endoscopy codes (91110, 91113) are growing too, particularly with increased payer coverage and cases where traditional scopes are not possible.