Q03.0
Malformations of aqueduct of Sylvius
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 4
Index entries leading here 8
- Anomaly, anomalous (congenital) (unspecified type) Q89.9
- aqueduct of Sylvius Q03.0
- Atresia, atretic
- aqueduct of Sylvius Q03.0
- Obstruction, obstructed, obstructive
- Occlusion, occluded
- Septum, septate (congenital) — see also Anomaly, by site
- aqueduct of Sylvius Q03.0
- Stricture — see also Stenosis
- aqueduct of Sylvius (congenital) Q03.0
- Stenosis, stenotic (cicatricial) — see also Stricture
- aqueduct of Sylvius (congenital) Q03.0
- Hydrocephalus (acquired) (external) (internal) (malignant) (recurrent) G91.9
- aqueduct Sylvius stricture Q03.0
Alongside this code 3 same parent — Q03
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.