Extreme immaturity of NB, gestatnl age 23 completed weeks

This code signifies a liveborn infant delivered at an extremely premature gestational age of 23 completed weeks. These newborns are at the very edge of viability and present with significant physiological immaturity across all organ systems, requiring intensive medical intervention.

Assign this code for liveborn infants whose documented gestational age at birth is precisely 23 completed weeks. This diagnosis is typically established by obstetric ultrasound dating or early postnatal assessment. Documentation must clearly state "23 completed weeks" or "23 weeks and 0-6 days."

• Do not use if the gestational age is 22 weeks 6 days or less, or 24 weeks 0 days or more.
• Always sequence this code as a secondary diagnosis following the appropriate Z38 code for liveborn infant.
• Ensure the medical record explicitly states "completed weeks" to avoid ambiguity in gestational age calculation.