Getting paid correctly in gastroenterology depends on more than picking the right CPT code. Prior authorization, NCCI bundling edits, screening-vs-diagnostic billing rules, and documentation gaps all shape whether a clean claim turns into a denial. We'll work through real-world GI reimbursement scenarios and connect the documentation, the payer rules, and the claim submission to the outcome. You'll see where claims commonly stall, what payers are actually looking for, and how to build a workflow that keeps reimbursement on track before the claim ever goes out.