P07.21
Extreme immaturity of newborn, gestational age less than 23 completed weeks
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
Extreme immaturity of newborn, gestational age less than 23 weeks, 0 days
Less than 28 completed weeks (less than 196 completed days) of gestation.
the listed conditions, without further specification, as the cause of morbidity or additional care, in newborn
When both birth weight and gestational age of the newborn are available, both should be coded with birth weight sequenced before gestational age
conditions that have their origin in the fetal or perinatal period (before birth through the first 28 days after birth) even if morbidity occurs later
congenital malformations, deformations and chromosomal abnormalities (Q00-Q99) endocrine, nutritional and metabolic diseases (E00-E88) injury, poisoning and certain other consequences of external causes (S00-T88) neoplasms (C00-D49) tetanus neonatorum (A33)
Codes from this chapter are for use on newborn records only, never on maternal records
Official Guidelines for P07.21
FY 2026 ›Subsections
- I.C.16.aGeneral Perinatal Rules
- I.C.16.bObservation and Evaluation of Newborns for Suspected
- I.C.16.cCoding Additional Perinatal Diagnoses
- I.C.16.dPrematurity and Fetal Growth Retardation
- I.C.16.eLow birth weight and immaturity status
- I.C.16.fBacterial Sepsis of Newborn
- I.C.16.gStillbirth
- I.C.16.hCOVID-19 Infection in Newborn
Sections that reference P07.21
- I.C.16.dPrematurity and Fetal Growth Retardation
… Assignment of codes in categories P05, Disorders of newborn related to slow fetal growth and fetal malnutrition, and P07, Disorders of newborn related to short gestation and low birth weight, not elsewhere classified, should be based on the …
- I.C.16.eLow birth weight and immaturity status
Codes from category P07, Disorders of newborn related to short gestation and low birth weight, not elsewhere classified, are for use for a child or …
Sections whose FY 2026 text names P07.21, its P07 category, or a range containing it — the chapter guidance above is the authoritative source.
Find P07.21 in the alphabetic index
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