2026 ICD-10-CM Diagnosis Code P07.20Extreme immaturity of newborn, unspecified weeks of gestation

ICD-10-CM Codes›P00–P96›P05-P08›P07

ICD-10-CM P07.20
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P07.20 is a billable ICD-10-CM diagnosis code for extreme immaturity of newborn, unspecified weeks of gestation. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as extreme prematurity of infant. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Short gestation; low birth weight; and fetal growth retardation.

Code Identity

ICD-10-CM Code
P07.20
Billable Status
Yes — Valid for Submission
Code Describes
Extreme immaturity of newborn, unspecified weeks of gestation
Short Description
Extreme immaturity of newborn, unsp weeks of gestation
Parent Code
P07.2
Extreme immaturity of newborn

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP05-P08Disorders of newborn related to length of gestation and fetal growth
CategoryP07Disorders of newborn related to short gestation and low birth weight, not elsewhere classified
This CodeP07.20Extreme immaturity of newborn, unspecified weeks of gestation

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Extreme prematurity of infant
  • Gestation abnormality
  • Premature baby less than 26 weeks
  • Prematurity of infant
  • Short fetal gestation
  • Very preterm maturity of infant

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Gestational age less than 28 completed weeks NOS

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • 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)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PNL002
Short gestation; low birth weight; and fetal growth retardation
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Premature Babies

Almost 1 of every 10 infants born in the United States are premature, or preemies. A premature birth is when a baby is born before 37 completed weeks of pregnancy. A full-term pregnancy is 40 weeks.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert P07.20 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
765.20 Weeks of gestation NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About P07.20Overview

Is P07.20 (Extreme immaturity of newborn) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report extreme immaturity of newborn, unspecified weeks of gestation on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of P07.20?

Under the General Equivalence Mappings, extreme immaturity of newborn, unspecified weeks of gestation converts to ICD-9-CM 765.20 (weeks of gestation NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.