Extreme immaturity of NB, gestatnl age < 23 completed weeks

This code signifies a liveborn infant delivered at an extremely premature gestational age, specifically before the completion of 23 weeks of gestation. These newborns are at the absolute limit of viability and face significant medical challenges due to underdeveloped organ systems.

This code is used for a newborn diagnosed with extreme prematurity based on a gestational age of less than 23 completed weeks at birth. Documentation must clearly state the gestational age at delivery, typically derived from early ultrasound or last menstrual period. It is applied when the primary reason for admission or clinical focus is the infant's extreme immaturity.

• Always confirm the gestational age in completed weeks; "less than 23 completed weeks" is critical for this specific code.
• Do not confuse with other prematurity codes that specify different gestational age ranges.
• This code is typically sequenced as the principal diagnosis for the newborn's admission when prematurity is the primary reason for care.