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Q03.1

Atresia of foramina of Magendie and Luschka

Billable FY2026 2025-10-01 → 2026-09-30
Exclusions 4 never code together
Q03code
Excludes1
  • Arnold-Chiari syndrome, type II (Q07.0-)Q07.0-
  • acquired hydrocephalus (G91.-)G91.-
  • hydrocephalus due to congenital toxoplasmosis (P37.1)P37.1
  • hydrocephalus with spina bifida (Q05.0-Q05.4)Q05.0-Q05.4

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Instructional notes 2
Q03code
Includes
  • hydrocephalus in newborn
Q03.1code
Inclusion terms
  • Dandy-Walker syndrome
Index entries leading here 7
  • Atresia, atretic
  • Block, blocked
    • foramen Magendie (acquired) G91.1
  • Hydrocephalus (acquired) (external) (internal) (malignant) (recurrent) G91.9
    • foramen Magendie block (acquired) G91.1
  • Cyst (colloid) (mucous) (simple) (retention)
  • Syndrome — see also Disease
  • Deformity Q89.9
  • Dandy-Walker syndrome Q03.1
Alongside this code 3 same parent — Q03
Q03.0 Malformations of aqueduct of Sylvius Q03.8 Other congenital hydrocephalus Q03.9 Congenital hydrocephalus, unspecified
Additional references
AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

CMS22HCC72 CMS28HCC182 ESRD21HCC72 ESRD24HCC72 RX08HCC155

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This code

Billable
yes
Code set
FY2026
Parent
Q03
Block
Q00-Q07
Siblings
3

Present FY2024–FY2027.