World Health Organization · 2026-01 · English
KA21.3 Extreme prematurity of newborn
Official WHO ICD-11 MMS tabulation. This international classification is separate from US ICD-10-CM. For complete instructions and postcoordination, consult the WHO browser.
Coding notes · WHO
When both birth weight and gestational age are available, priority of assignment should be given to birth weight.
More specific 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 weeksKA21.3ZExtreme prematurity of newborn, unspecified© World Health Organization · CC BY-ND 3.0 IGO