ICD-10-CM Alphabetic Index · FY 2026 15 Entries
Immaturity in the ICD-10-CM Index ICD-10-CM
The main term Immaturity (less than 37 completed weeks) carries 15 index entries pointing to 10 ICD-10-CM codes. Every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
15
Index Entries
10
Codes Referenced
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Default Code
I
Letter
15 of 15 shown
ICD-10-CM
Index Entries Under Immaturity 15 entries · 10 codes
Immaturity (less than 37 completed weeks)
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), after puberty E30.0
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
