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Modifier 25 is one of the most powerful and most dangerous tools in medical billing. Used correctly, it unlocks reimbursement for significant, separately identifiable E/M services performed on the same day as a procedure. Used incorrectly, it triggers audits, denials, and recoupments. This complete 2026 guide explains exactly when to use it, what documentation payers demand, common pitfalls, and proven strategies to protect both your revenue and compliance.