Summary & Overview
CPT 99191: Pump–Oxygenator/Heat Exchanger Operation, 45 Minutes
CPT code 99191 captures the assembly and operation of a mechanical pump–oxygenator or heat exchanger for extracorporeal circulation and oxygenation of blood for a 45-minute interval. This procedure is a critical intraoperative service during cardiac surgeries requiring cardiopulmonary bypass and supports patient hemodynamics and oxygenation while the heart is temporarily stopped. Nationally, accurate capture of this code affects clinical documentation, case mix reporting, and claims processing for major cardiac procedures.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical context and service setting for 99191, an outline of common billing considerations, and what to expect in standardized claims handling across major payers. The publication provides benchmarks where available, notes on typical sites of service, and a summary of common modifiers and billing practice nuances. Data not available in the input is noted and omitted; the focus remains on the code’s clinical role, payer coverage landscape, and implications for procedural documentation and hospital operating-room billing workflows.
Billing Code Overview
CPT code 99191 describes the preparation and operation of a mechanical pump–oxygenator or heat exchanger to provide circulation and oxygenation of blood outside the body for a 45-minute period. The service may include monitoring of the patient’s blood pressure and performing an ECG, and it supports cardiopulmonary bypass and other extracorporeal circulation needs during cardiac surgeries.
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Service type: Extracorporeal circulation support, pump–oxygenator or heat exchanger operation
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Typical site of service: Inpatient operating room or cardiac surgery suite where cardiopulmonary bypass is performed
Clinical & Coding Specifications
Clinical Context
A 62-year-old male with severe three-vessel coronary artery disease is scheduled for elective coronary artery bypass grafting (CABG). Before incision, the perfusionist assembles and primes the cardiopulmonary bypass circuit including a mechanical pump–oxygenator and heat exchanger. The perfusionist verifies integrity, de-aerates the circuit, initiates the pump to establish extracorporeal circulation for 45 minutes of operative support, and continuously monitors circuit pressures, oxygenation, and gas exchange while the anesthesia and surgical teams manage hemodynamics and myocardial protection. The service occurs in an inpatient operating room setting. Documentation includes start and stop times for the pump operation, components assembled, patient monitoring data (blood pressure, ECG), any circuit interventions, and the perfusionist’s signature.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier reported | Standard reporting when no modifier applies |
22 | Increased procedural services | Use when significantly greater work or time is required beyond typical pump setup/operation |