6A4Z0ZZ
Hypothermia None to No Qualifier with No Qualifier, Single Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | 6 Extracorporeal or Systemic Therapies |
| Body System | A Physiological Systems |
| Operation | 4 Hypothermia |
| Body Part | Z None |
| Approach | 0 Single |
| Device | Z No Qualifier |
| Qualifier | Z No Qualifier |
Operation Definition
Extracorporeal lowering of body temperature
Procedure Overview
Therapeutic hypothermia deliberately lowers a patient's core body temperature using cooling blankets, cooling catheters, or circulating water systems. It is used most often after cardiac arrest and in newborns who experienced oxygen deprivation around birth, since slowing the body's metabolism reduces the brain's oxygen demand and can limit further injury during the critical hours after the event.
The process is carefully staged: cooling to a target temperature, maintaining it for a set period, then rewarming slowly, all while vital signs and neurological status are tracked. It is a protocol-driven intervention performed in intensive care settings rather than a routine comfort measure.
Anatomy & Axis Detail
Procedure Detail
Hypothermia with a body part value of None describes therapeutic lowering of core body temperature applied systemically rather than to a single organ, a technique used in settings such as cardiac arrest management, certain neurologic injuries, or during procedures requiring reduced metabolic demand across the whole body. Cooling blankets, cooling catheters placed in central vessels, or ice packs applied broadly are typical delivery methods, and the clinical goal is to reduce oxygen consumption and limit secondary tissue injury rather than to treat a localized structure. Documentation should specify the target temperature, duration of cooling, and rewarming protocol, since these elements confirm that the intervention was a deliberate systemic therapy rather than incidental temperature management occurring alongside another procedure.
Duration: Single
In Extracorporeal or Systemic Therapies, this value in the duration position indicates the treatment was administered as one isolated session rather than a planned series. It matters for coding accuracy because payers and registries track whether a therapy like phototherapy or hyperthermia was a one-time intervention. It is distinguished from Multiple, which captures repeated or ongoing courses of the same therapy.
Coding & Documentation
Documentation supporting this code should describe the cooling device or method used, the target temperature achieved, the duration the patient was kept cooled, and the clinical indication, typically post-arrest neuroprotection or neonatal encephalopathy. A common mistake is coding this root operation for a patient who arrived hypothermic by accident and was simply rewarmed to normal; that scenario is the opposite direction and does not belong here. Another frequent error is coding temperature monitoring alone, without an active cooling intervention, as therapeutic hypothermia.
Commonly Confused With
The most common point of confusion is with Hyperthermia, since both belong to the same family of systemic temperature-control procedures but act in opposite directions. It can also be confused with passive temperature management, such as removing blankets or adjusting room temperature, which is not device-based and is not coded as a procedure. Coders should also distinguish it from rewarming techniques used to treat accidental or environmental hypothermia, which involves raising temperature rather than lowering it.