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Many home infusion agencies lose 25–60% of potential revenue by underbilling CPT 99602 on visits longer than two hours. This complete 2026 guide explains exact time-unit calculations for CPT 99601 and 99602, required documentation standards, the most expensive denial triggers (including 99602 without 99601), and proven workflows that maximize clean-claim rates and reimbursement on every IV antibiotic, hydration, biologic, and TPN visit.