Extreme immaturity of newborn
Notes: Less than 28 completed weeks (less than 196 completed days) of gestation. ; Gestational age less than 28 completed weeks NOS ; Extreme immaturity of newborn, gestational age less than 23 weeks, 0 days ; Extreme immaturity of newborn, gestational age 23 weeks, 0 days through 23 weeks, 6 days ; Extreme immaturity of newborn, gestational age 24 weeks, 0 days through 24 weeks, 6 days ; Extreme immaturity of newborn, gestational age 25 weeks, 0 days through 25 weeks, 6 days ; Extreme immaturity of newborn, gestational age 26 weeks, 0 days through 26 weeks, 6 days ; Extreme immaturity of newborn, gestational age 27 weeks, 0 days through 27 weeks, 6 days