2026 ICD-10-CM Diagnosis Code P05.9Newborn affected by slow intrauterine growth, unspecified

ICD-10-CM Codes›P00–P96›P05-P08›P05

ICD-10-CM P05.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P05.9 is a billable ICD-10-CM diagnosis code for newborn affected by slow intrauterine growth, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as café au lait spots. 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
P05.9
Billable Status
Yes — Valid for Submission
Code Describes
Newborn affected by slow intrauterine growth, unspecified
Short Description
Newborn affected by slow intrauterine growth, unspecified
Same as the full description in the CMS dataset.
Parent Code
P05
Disorders of newborn related to slow fetal growth and fetal malnutrition

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 CodeP05.9Newborn affected by slow intrauterine growth, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Café au lait spots
  • Diabetes mellitus associated with genetic syndrome
  • Insulin resistance
  • Intrauterine growth restriction, congenital multiple café au lait macules, increased sister chromatid exchange syndrome
  • Intrauterine growth restriction, metaphyseal dysplasia, adrenal hypoplasia congenita, and genital anomaly syndrome
  • Intrauterine growth restriction, short stature, early adult-onset diabetes syndrome
  • Malabsorption of glucose
  • Neonatal polycythemia
  • Neonatal polycythemia due to intra-uterine growth retardation

Tabular List NotesGuidance

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

Inclusion Terms

  • Newborn affected by fetal growth retardation 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.

    • Newborn(infant) (liveborn) (singleton)
      • affected by
        • fetal (intrauterine)
          • growth retardation
    • Newborn(infant) (liveborn) (singleton)
      • affected by
        • slow intrauterine growth

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

Clinical InformationClinical

  • Insulin Resistance

    diminished effectiveness of insulin in lowering blood sugar levels: requiring the use of 200 units or more of insulin per day to prevent hyperglycemia or ketosis.

  • Metabolic Syndrome

    a cluster of symptoms that are risk factors for cardiovascular diseases and type 2 diabetes mellitus. the major components of metabolic syndrome include abdominal obesity; atherogenic dyslipidemia; hypertension; hyperglycemia; insulin resistance; a proinflammatory state; and a prothrombotic (thrombosis) state.

  • Homeostatic Model Assessment of Insulin Resistance

    an assessment of beta-cell function and insulin resistance based on fasting blood glucose and insulin concentrations.

  • Hyperandrogenism, Insulin Resistance, Acanthosis Nigricans Syndrome|HAIR-AN Syndrome

    a condition characterized by hyperandrogenism, insulin resistance, and acanthosis nigricans, typically associated with obesity in teenage girls. it is considered to be a subtype of polycystic ovarian syndrome, but may occur in male individuals. etiology is unclear, but some cases may be associated with mutations affecting the tyrosine kinase domain of the insulin receptor.

  • Insulin Receptor Mutation - Associated Insulin Resistance Syndromes

    insulin resistance caused by inactivating mutation(s) in the insr gene encoding the insulin receptor.

  • Insulin Resistance

    decreased sensitivity to circulating insulin which may result in acanthosis nigicrans, elevated insulin level or hyperglycemia.

  • Insulin Resistance Measurement|INSULINR|Insulin Resistance|Insulin Resistance

    the determination of the insulin resistance (cells inability to respond to insulin) in a biological specimen.

  • Insulin Resistance Syndrome

    a cluster of closely related metabolic abnormalities associated with insulin resistance that confer an increased risk of the development of type 2 diabetes and cardiovascular disease. these abnormalities may include obesity, high blood pressure, abnormal cholesterol levels, proteinuria, and/or polycystic ovary syndrome.

  • Insulin Resistant Diabetes Mellitus with Acanthosis Nigricans and Hyperandrogenism|Type A Insulin Resistance Syndrome

    a syndrome of insulin resistance caused by mutation(s) in the insr gene, encoding the insulin receptor. this condition is characterized by a clinical triad of hyperinsulinemia, acanthosis nigricans, and hyperandrogenism without lipodystrophy. this is the least severe of a spectrum of disorders; the other two conditions are rabson-mendenhall syndrome and donohoe syndrome.

  • Obesity-Associated Insulin Resistance

    insulin resistance associated with obesity, which may be attributed in part to impaired insulin signaling in target tissues, or impaired insulin-stimulated glucose transport due to reduced expression of the glucose transporter protein 4.

Patient EducationClinical

Uncommon Infant and Newborn Problems

It can be scary when your baby is sick, especially when it is not an everyday problem like a cold or a fever. You may not know whether the problem is serious or how to treat it. If you have concerns about your baby's health, call your health care provider right away.

Read the full article at MedlinePlus

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

Convert P05.9 to ICD-9-CMHistory

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

ICD-9-CM
764.90 Fet growth retard 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 P05.9Overview

Is P05.9 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report newborn affected by slow intrauterine growth, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

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

Under the General Equivalence Mappings, newborn affected by slow intrauterine growth, unspecified converts to ICD-9-CM 764.90 (fet growth retard 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.