ICD-10 Code for Immaturity

The ICD-10-CM 2027 alphabetic index lists immaturity with the subterms below. More specific codes depend on the details documented, as listed in the official index (10 codes, 10 billable).

Index entries for Immaturity

extreme of newborn (less than 28 completed weeks of gestation) (less than 196 completed days of gestation) (unspecified weeks of gestation) – P07.20
- gestational age
  - 23 completed weeks (23 weeks, 0 days through 23 weeks, 6 days) – P07.22
  - 24 completed weeks (24 weeks, 0 days through 24 weeks, 6 days) – P07.23
  - 25 completed weeks (25 weeks, 0 days through 25 weeks, 6 days) – P07.24
  - 26 completed weeks (26 weeks, 0 days through 26 weeks, 6 days) – P07.25
  - 27 completed weeks (27 weeks, 0 days through 27 weeks, 6 days) – P07.26
  - less than 23 completed weeks – P07.21
fetus or infant light-for-dates – see Light-for-dates
lung, newborn – P28.0
organ or site NEC – see Hypoplasia
pulmonary, newborn – P28.0
reaction – F60.89
sexual (female) (male) – E30.0

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.