Summary & Overview
CPT 99116: Total Body Hypothermia, Anesthesia Add-On
Headline: New focus on CPT code 99116 as total body hypothermia becomes prominent in complex anesthesia cases
Lead: CPT code 99116 designates the use of total body hypothermia as an add-on to primary anesthesia procedures when induced hypothermia complicates anesthetic management. The code matters nationally because it documents a specialized intraoperative intervention that changes anesthetic risk, resource needs and billing pathways.
Why it matters: Total body hypothermia is used in select high-acuity surgical and procedural cases to achieve clinical goals such as neuroprotection or hemorrhage control. Proper reporting of CPT code 99116 ensures clinical intent is recognized and supports appropriate payment and quality measurement where applicable.
Payers covered: This analysis addresses national payer approaches including Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare and Medicare.
What readers will learn: The publication explains the clinical context for using induced total body hypothermia during procedures, the correct use of CPT code 99116 as an add-on anesthesia code, and implications for billing and documentation. It summarizes typical sites of service, common modifiers used in anesthesia billing (listed separately), and notes where input data are not available. Benchmarks, payer coverage patterns, and any policy updates relevant to reporting this code are discussed to inform coding, compliance and revenue integrity efforts.
Scope: Content is framed for a national audience and focuses on coding, clinical context and payer considerations without state-specific guidance.
Billing Code Overview
CPT code 99116 describes the use of total body hypothermia during a procedure. This is an add-on anesthesia service reported only when the provider intentionally induces hypothermia in the patient and that intervention complicates the administration of anesthesia.
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Service type: Anesthesia add-on service for induced total body hypothermia
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Typical site of service: Hospital operating room or other procedural/surgical setting where anesthesia is administered
Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes.
Clinical & Coding Specifications
Clinical Context
A 28-year-old neonate born after a complicated delivery presents with moderate to severe hypoxic-ischemic encephalopathy. During the neonatal intensive care unit (NICU) admission, the neonatologist and pediatric anesthesiology team initiate total body hypothermia as part of a controlled neuroprotective strategy concurrent with operative procedures or anesthesia-requiring interventions. The workflow begins with multidisciplinary confirmation of eligibility (gestational age, time since insult, clinical exam, and amplitude-integrated EEG when available). The anesthesia team documents decision-making and obtains informed consent for anesthesia and adjunctive therapies. During the anesthetic, an active cooling device is applied and core temperature is lowered to a therapeutic target (typically around 33.5°C) and maintained for the prescribed duration while anesthesia is managed for procedural needs or transport. Vital signs, coagulation, and metabolic status are closely monitored; rewarming is performed in a controlled fashion after completion of the therapeutic period. For billing, 99116 is reported as an add-on to the primary anesthesia procedure code to represent the additional anesthesia complexity and resources required when the provider induces and manages total body hypothermia during anesthesia delivery.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services |