2026 ICD-10-CM Diagnosis Code E84.11Meconium ileus in cystic fibrosis

ICD-10-CM Codes›E00–E89›E70-E88›E84

ICD-10-CM E84.11
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E84.11 is a billable ICD-10-CM diagnosis code for meconium ileus in cystic fibrosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is restricted by the Medicare Code Editor to newborn patients (age 0). Coders also document this condition as cystic fibrosis with meconium ileus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cystic fibrosis.

Code Identity

ICD-10-CM Code
E84.11
Billable Status
Yes — Valid for Submission
Code Describes
Meconium ileus in cystic fibrosis
Short Description
Meconium ileus in cystic fibrosis
Same as the full description in the CMS dataset.
Parent Code
E84.1
Cystic fibrosis with intestinal manifestations

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE70-E88Metabolic disorders
CategoryE84Cystic fibrosis
This CodeE84.11Meconium ileus in cystic fibrosis

Code EditsBilling

Medicare Code Editor checks that affect claim validity for E84.11.

Perinatal / Newborn diagnoses
The Medicare Code Editor detects inconsistencies in perinatal / newborn cases by checking a patient's age and any diagnosis on the patient's record. The newborn code edits apply to patients age 0 years only; a subset of diagnoses which will only occur during the perinatal or newborn period of age 0 (e.g., tetanus neonatorum, health examination for newborn under 8 days old).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cystic fibrosis with meconium ileus
  • Meconium ileus
  • Neonatal obstruction of intestine
  • Perforation of intestine due to cystic fibrosis with meconium ileus
  • Perinatal intestinal obstruction
  • Perinatal intestinal perforation

Tabular List NotesGuidance

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

Type 1 Excludes

  • meconium ileus not due to cystic fibrosis P76.0

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.

    • Ileus(bowel) (colon) (inhibitory) (intestine)
      • meconium
        • in cystic fibrosis
    • Ileus(bowel) (colon) (inhibitory) (intestine)
      • newborn
        • due to meconium
          • in cystic fibrosis
    • Meconium
      • ileus, newborn
        • in cystic fibrosis
    • Meconium
      • obstruction, newborn
        • in mucoviscidosis
    • Mucoviscidosis
      • with meconium obstruction
    • Obstruction, obstructed, obstructive
      • intestine
        • newborn
          • due to
            • meconium (plug)
              • in mucoviscidosis
    • Obstruction, obstructed, obstructive
      • meconium (plug)
        • newborn
          • in mucoviscidosis

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR END012
Cystic fibrosis
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Meconium Ileus

    intestinal obstruction caused by congealed meconium in the distal ileum and cecum. it presents shortly after birth as a failure to pass meconium and frequently occurs in infants with cystic fibrosis.

  • Cystic Fibrosis with Meconium Ileus

    a congenital metabolic detected in the neonatal period that is characterized by the presence of a meconium ileus. the disease affects the exocrine glands andis inherited as an autosomal trait. the secretions of exocrine glands are abnormal, resulting in excessively viscid mucus production which causes obstruction of passageways (including pancreatic and bile ducts, intestines, and bronchi). the sweat sodium and chloride content are increased. symptoms usually appear in childhood and include meconium ileus, poor growth despite good appetite, malabsorption and foul bulky stools, chronic bronchitis with cough, recurrent pneumonia, bronchiectasis, emphysema, clubbing of the fingers, and salt depletion in hot weather.

  • Meconium Ileus

    small intestinal obstruction that results from the impaction of thick meconium in the distal small intestine.

Patient EducationClinical

Cystic Fibrosis

Cystic fibrosis (CF) is an inherited disease of the mucus and sweat glands. It affects mostly your lungs, pancreas, liver, intestines, sinuses, and sex organs. CF causes your mucus to be thick and sticky. The mucus clogs the lungs, causing breathing problems and making it easy for bacteria to grow.

Read the full article at MedlinePlus

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

Convert E84.11 to ICD-9-CMHistory

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

ICD-9-CM
277.01 Cystic fibrosis w ileus
Exact Match The mapping is direct, with no qualifiers.

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 E84.11Overview

Is E84.11 (Cystic fibrosis with intestinal manifestations) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report meconium ileus in cystic fibrosis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Who can E84.11 be reported for?

The Medicare Code Editor checks meconium ileus in cystic fibrosis against patient demographics: this code is intended for newborn patients (age 0). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of E84.11?

Under the General Equivalence Mappings, meconium ileus in cystic fibrosis converts to ICD-9-CM 277.01 (cystic fibrosis w ileus). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.