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P07.20 Extreme immaturity of newborn, unspecified weeks of gestation
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P07.21 Extreme immaturity of newborn, gestational age less than 23 completed weeks
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P07.22 Extreme immaturity of newborn, gestational age 23 completed weeks
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P07.23 Extreme immaturity of newborn, gestational age 24 completed weeks
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P07.24 Extreme immaturity of newborn, gestational age 25 completed weeks
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P07.25 Extreme immaturity of newborn, gestational age 26 completed weeks
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P07.26 Extreme immaturity of newborn, gestational age 27 completed weeks