ICD-10-CM > P00-P96 > P05-P08 > P07 > P07.2 > P07.24 P07.24 Extreme immaturity of newborn, gestational age 25 completed weeks Billable/Specific Copy Code Copy Description Applicable To Extreme immaturity of newborn, gestational age 25 weeks, 0 days through 25 weeks, 6 days