KA21.3
category
Extreme prematurity of newborn
Definition
Less than 28 completed weeks (less than 196 completed days) of gestation.
Coding note
When both birth weight and gestational age are available, priority of assignment should be given to birth weight.
8 subordinate codes
KA21.30Extreme prematurity of newborn, gestational age less than 22 completed weeksKA21.31Extreme prematurity of newborn, gestational age 22 completed weeksKA21.32Extreme prematurity of newborn, gestational age 23 completed weeksKA21.33Extreme prematurity of newborn, gestational age 24 completed weeksKA21.34Extreme prematurity of newborn, gestational age 25 completed weeksKA21.35Extreme prematurity of newborn, gestational age 26 completed weeksKA21.36Extreme prematurity of newborn, gestational age 27 completed weeks4B4ZDiseases of the immune system, unspecified