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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.

Urgent care billing in 2026 is tougher than ever CMS fee schedule shifts, evolving CPT codes, telehealth complexities, and stricter payer scrutiny are driving denials higher. This guide breaks down key changes, E/M coding accuracy, modifier rules (25 & 59), documentation must-haves, and proven workflows to prevent denials, speed reimbursements, and protect revenue in fast-paced urgent care settings.