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CPT 96366: Intravenous Infusion, Additional Hour(s)
CPT code 96366 covers administration of an intravenous infusion for an additional hour or subsequent hours after the initial hour, supporting continued delivery of therapeutic, prophylactic, or diagnostic medications. This code matters nationally because extended IV infusion services are common across oncology, cardiology, and other specialties that require prolonged infusion times; accurate coding affects claims processing, care documentation, and payer contracts. Key payers included in this analysis are Aetna, Blue Cross Blue Shield, Cigna Health, United Healthcare, and Medicare. Readers will learn what 96366 represents clinically and operationally, how it relates to the initial infusion code and subsequent-hour coding, typical sites of service where the code applies, and common clinical settings where extended infusion time is required. The publication provides benchmarks and coding context relevant to billing and reimbursement workflows, clarifies the relationship between initial infusion and additional-hour services, and outlines common clinical indications tied to extended infusion therapy. Data not available in the input is explicitly noted where applicable. This national overview is intended for billing professionals, revenue cycle teams, clinical administrators, and policy analysts seeking concise guidance on the role and application of CPT code 96366.
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Billing Code Overview
CPT code 96366 describes administration of an intravenous infusion of a medication for an additional hour or subsequent hours after the first hour to prevent, treat, or diagnose a condition or disease. The service is an extension of an initial intravenous therapeutic, prophylactic, or diagnostic infusion and is billed when one or more additional sequential hours of IV infusion are provided beyond the initial hour.
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Service type: Intravenous infusion therapy, additional hour(s) after the initial infusion
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Typical site of service: Infusion center, outpatient clinic, hospital outpatient department, or other ambulatory settings where intravenous infusions are administered
National Reimbursement Benchmarks
Medicare’s mean rate of $22.2 for CPT 96366 sits well below BUCA’s average commercial mean of $54.3, indicating a substantial gap between public and commercial reimbursement for this infusion administration code. The $32.1 difference highlights that commercial payers on average reimburse roughly 2.4x Medicare for this service, with Medicare’s central tendency clustered tightly around the low $20s (25th–75th percentiles $21–$23).
Dispersion across payers varies: calculate P75−P25 ranges to compare spread. Aetna’s range is $32.8 ($52.9−$21.1), Blue Cross Blue Shield’s is $34.6 ($80.3−$48.4), BUCA’s is $27.8 ($65.7−$37.9), Cigna’s is $18.7 ($43.2−$21.5), and UnitedHealth Group’s is $20.7 ($42.9−$22.2). Cigna and UnitedHealth Group show the tightest interquartile spreads, while Blue Cross Blue Shield and Aetna show the widest variability.