Environmental hyperthermia of newborn

This code represents a newborn experiencing an elevated core body temperature due to external environmental factors, such as being overdressed, placed in an overheated incubator, or exposed to high ambient temperatures. This condition is distinct from fever caused by infection or metabolic disorders.

Use this code when documentation clearly indicates hyperthermia in a neonate resulting from environmental causes, without evidence of infection or other underlying medical conditions. Supporting documentation would include vital signs showing elevated temperature, physician notes describing the environmental cause, and ruling out infectious etiologies.

• Differentiate carefully from fever of unknown origin (R50.9) or fever due to infection (e.g., specific infectious disease codes).
• Ensure the documentation explicitly states "environmental" as the cause of hyperthermia in the newborn.
• Do not use this code if the hyperthermia is a symptom of another diagnosed condition in the newborn.