E84.11 Meconium ileus in cystic fibrosis

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Excludes1 (never code together)

• meconium ileus not due to cystic fibrosis (P76.0)

Applies from E84 Cystic fibrosis

Includes

• mucoviscidosis

Code also

• exocrine pancreatic insufficiency (K86.81)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 277 — Cystic Fibrosis
• CMS-HCC V22: HCC 110 — Cystic Fibrosis
• RxHCC V08: HCC 225 — Cystic Fibrosis
• ESRD V24: HCC 110

MS-DRG index

Defines the logic of DRG(s) 791 in MDC 15.

Approximate ICD-9-CM (GEMs)

• 277.01 Cystic fibrosis with meconium ileus

Medicare Code Edits (MCE v43.1 (April 2026))

• Perinatal/Newborn diagnoses: Age conflict edit. These diagnoses occur only during the perinatal or newborn period, so the Medicare Code Editor flags them on any record where the patient is not age 0.

Code annotations containing back-references to E84.11

Back-references to E84.11

• Type 1 Excludes: K56 Paralytic ileus and intestinal obstruction without hernia ("cystic fibrosis with meconium ileus (E84.11)")
• Type 1 Excludes: P76.0 Meconium plug syndrome ("meconium ileus in cystic fibrosis (E84.11)")
• Type 1 Excludes: Q41 Congenital absence, atresia and stenosis of small intestine ("cystic fibrosis with intestinal manifestation (E84.11)")

Back-references to E84.1

• Type 1 Excludes: P78 Other perinatal digestive system disorders ("cystic fibrosis (E84.0-E84.9)")
• Type 1 Excludes: Q45.3 Other congenital malformations of pancreas and pancreatic duct ("cystic fibrosis (E84.0-E84.9)")

Back-references to E84

• Code First: E08 Diabetes mellitus due to underlying condition ("cystic fibrosis (E84.-)")
• Type 2 Excludes: G11 Hereditary ataxia ("metabolic disorders (E70-E88)")
• Code First: G63 Polyneuropathy in diseases classified elsewhere ("metabolic diseases (E70-E88)")
• Type 2 Excludes: G71 Primary disorders of muscles ("metabolic disorders (E70-E88)")
• Code First: H42 Glaucoma in diseases classified elsewhere ("specified metabolic disorder (E70-E88)")
• Code First: J93.12 Secondary spontaneous pneumothorax ("cystic fibrosis (E84.-)")
• Type 2 Excludes: K86 Other diseases of pancreas ("fibrocystic disease of pancreas (E84.-)")
• Type 2 Excludes: N25.0 Renal osteodystrophy ("metabolic disorders classifiable to E70-E88")
• Type 2 Excludes: N25.81 Secondary hyperparathyroidism of renal origin ("metabolic disorders classifiable to E70-E88")
• Type 1 Excludes: P59 Neonatal jaundice from other and unspecified causes ("jaundice due to inborn errors of metabolism (E70-E88)")
• Type 1 Excludes: Q45.3 Other congenital malformations of pancreas and pancreatic duct ("fibrocystic disease of pancreas (E84.-)")
• Code First: Q55.3 Atresia of vas deferens ("any associated cystic fibrosis (E84.-)")
• Code Also: Z71.87 Encounter for pediatric-to-adult transition counseling ("cystic fibrosis (E84.-)")

Diagnosis Index entries for E84.11

• 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

Nearby codes

• E84 Cystic fibrosis
• E84.0 Cystic fibrosis with pulmonary manifestations
• E84.1 Cystic fibrosis with intestinal manifestations
• E84.11 Meconium ileus in cystic fibrosis (this code)
• E84.19 Cystic fibrosis with other intestinal manifestations
• E84.8 Cystic fibrosis with other manifestations
• E84.9 Cystic fibrosis, unspecified