2026 ICD-10-CM Diagnosis Code P05.10Newborn small for gestational age, unspecified weight

ICD-10-CM Codes›P00–P96›P05-P08›P05

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

P05.10 is a billable ICD-10-CM diagnosis code for newborn small for gestational age, unspecified weight. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as abnormal weight. 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
P05.10
Billable Status
Yes — Valid for Submission
Code Describes
Newborn small for gestational age, unspecified weight
Short Description
Newborn small for gestational age, unspecified weight
Same as the full description in the CMS dataset.
Parent Code
P05.1
Newborn small 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 CodeP05.10Newborn small for gestational age, unspecified weight

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal weight
  • Birth weight abnormality
  • Small-for-dates baby

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.

    • Small-for-dates(infant)

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

Birth Weight

Birth weight is the first weight of your baby, taken just after being born. A low birth weight means that the baby is less than 5 pounds, 8 ounces. A high birth weight means that the baby is more than 8 pounds, 13 ounces.

The full article covers:

  • What is birth weight?
  • What can cause low birth weight?
  • What problems can low birth weight cause?
  • What can cause high birth weight?
  • What problems can high birth weight cause?
  • Can birth weight problems be prevented?

Read the full article at MedlinePlus

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

Convert P05.10 to ICD-9-CMHistory

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

ICD-9-CM
764.10 Lt-for-date w/mal wtNOS
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 P05.10Overview

Is P05.10 (Newborn small for gestational age) a billable code?

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

What is the ICD-9 equivalent of P05.10?

Under the General Equivalence Mappings, newborn small for gestational age, unspecified weight converts to ICD-9-CM 764.10 (lt-for-date w/mal wtNOS). 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.