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ICD-10 Code P05.1: Newborn small for gestational age

P05.1 is an ICD-10 diagnosis entry used to group records related to Newborn small for gestational age. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain conditions originating in the perinatal period (P00-P96).

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain conditions originating in the perinatal period (P00-P96).

When is it used?

  • May be used when a clinician documents newborn small for gestational age in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
  • This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter
16Certain conditions originating in the perinatal period (P00-P96)
block
P05-P08Disorders of newborn related to length of gestation and fetal growth
category
P05Disorders of newborn related to slow fetal growth and fetal malnutrition
currentP05

Official coding notes

Inclusion terms
  • Newborn small-and-light-for-dates
  • Newborn small-for-dates
  • Weight and length below 10th percentile for gestational age

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

PediatricianNeonatologist

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
P05.1
Replacement codes
P05.10 — Newborn small for gestational age, unspecified weightP05.11 — Newborn small for gestational age, less than 500 gramsP05.12 — Newborn small for gestational age, 500-749 gramsP05.13 — Newborn small for gestational age, 750-999 gramsP05.14 — Newborn small for gestational age, 1000-1249 gramsP05.15 — Newborn small for gestational age, 1250-1499 gramsP05.16 — Newborn small for gestational age, 1500-1749 gramsP05.17 — Newborn small for gestational age, 1750-1999 gramsP05.18 — Newborn small for gestational age, 2000-2499 gramsP05.19 — Newborn small for gestational age, other

Common synonyms

Newborn small for gestational age

Frequently asked questions

Code details

CodeP05.1
SystemICD10
Display nameNewborn small for gestational age
ChapterCertain conditions originating in the perinatal period (P00-P96)
BlockDisorders of newborn related to length of gestation and fetal growth

Flags

BillableNo
Valid clinical useNo

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.