2026 ICD-10-CM Diagnosis Code P05.09Newborn light for gestational age, 2500 grams and over

ICD-10-CM Codes›P00–P96›P05-P08›P05

ICD-10-CM P05.09
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P05.09 is a billable ICD-10-CM diagnosis code for newborn light for gestational age, 2500 grams and over. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). 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
P05.09
Billable Status
Yes — Valid for Submission
Code Describes
Newborn light for gestational age, 2500 grams and over
Short Description
Newborn light for gestational age, 2500 grams and over
Same as the full description in the CMS dataset.
Parent Code
P05.0
Newborn light for gestational age

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP05-P08Disorders of newborn related to length of gestation and fetal growth
CategoryP05Disorders of newborn related to slow fetal growth and fetal malnutrition
This CodeP05.09Newborn light for gestational age, 2500 grams and over

Tabular List NotesGuidance

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

Inclusion Terms

  • Newborn light for gestational age, other

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.

    • Light-for-dates(infant)
      • with weight of
        • 2500 grams and over
    • Light-for-dates(infant)
      • specified NEC

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

Convert P05.09 to ICD-9-CMHistory

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

ICD-9-CM
764.00 Light-for-dates wtNOS
Approximate The match is approximate rather than exact.
ICD-9-CM
764.09 Lt-for-dates 2500+g
Approximate The match is approximate rather than exact.
ICD-9-CM
764.19 Lt-for-date w/mal 2500+g
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About P05.09Overview

Is P05.09 (Newborn light for gestational age) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report newborn light for gestational age, 2500 grams and over on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of P05.09?

Under the General Equivalence Mappings, newborn light for gestational age, 2500 grams and over converts to ICD-9-CM 764.00 (light-for-dates wtNOS), 764.09 (lt-for-dates 2500+g), and 764.19 (lt-for-date w/mal 2500+g). 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.