2027 ICD-10-CM Diagnosis Code P05.18Newborn small for gestational age, 2000-2499 grams

ICD-10-CM Codes›P00–P96›P05-P08›P05

ICD-10-CM P05.18
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

P05.18 is a billable ICD-10-CM diagnosis code for newborn small for gestational age, 2000-2499 grams. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 795. 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
P05.18
Billable Status
Yes — Valid for Submission
Code Describes
Newborn small for gestational age, 2000-2499 grams
Short Description
Newborn small for gestational age, 2000-2499 grams
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 CodeP05.18Newborn small for gestational age, 2000-2499 grams

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to P05.18: its own notes plus those printed at Chapter 16. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • conditions that have their origin in the fetal or perinatal period (before birth through the first 28 days after birth) even if morbidity occurs later

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • tetanus neonatorum (A33)

Notes

General instructions on how these codes are used.

From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • Codes from this chapter are for use on newborn records only, never on maternal records

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name P05.18, its category, or a range that includes it.

Excludes1 3

These codes carry an Excludes1 note naming P05.18: they are not reported together with it, unless the two conditions are unrelated.

  • P05.2 Newborn affected by fetal (intrauterine) malnutrition not light or small for gestational age
    newborn affected by fetal malnutrition with small for gestational age (P05.1-) names P05.1-, which includes this code
  • P07.0 Extremely low birth weight newborn
    low birth weight due to slow fetal growth and fetal malnutrition (P05.-) names P05.-, which includes this code
  • P07.1 Other low birth weight newborn
    low birth weight due to slow fetal growth and fetal malnutrition (P05.-) names P05.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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 P05.18 to ICD-9-CMHistory

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

ICD-9-CM
764.18 Lt-date w/mal 2000-2499g
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About P05.18Overview

What is the ICD-10 code for newborn small for gestational age, 2000-2499 grams?

The ICD-10-CM code for newborn small for gestational age, 2000-2499 grams is P05.18 (sometimes written as P0518). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is P05.18 (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, 2000-2499 grams on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does P05.18 group to?

When newborn small for gestational age, 2000-2499 grams is the principal diagnosis on an inpatient stay, it groups to MS-DRG 795 (normal Newborn), which carries a relative weight of 0.2022. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of P05.18?

Under the General Equivalence Mappings, newborn small for gestational age, 2000-2499 grams converts to ICD-9-CM 764.18 (lt-date w/mal 2000-2499g). The mapping is approximate, so confirm the match fits the documentation.