Q28.1
Other malformations of precerebral vessels
Billable FY2026 2025-10-01 → 2026-09-30
Exclusions 7 never code together
Q28code
Excludes1
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 2
Q28.1code
Inclusion terms
- Congenital malformation of precerebral vessels NOS
- Congenital precerebral aneurysm (nonruptured)
Index entries leading here 7
- Aberrant (congenital) — see also Malposition, congenital
- Absence (of) (organ or part) (complete or partial)
- Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) I72.9
- precerebral
- congenital (nonruptured) Q28.1
- precerebral
- Anomaly, anomalous (congenital) (unspecified type) Q89.9
- Dissection
- Distribution vessel, atypical Q27.9
- precerebral Q28.1
- Malformation (congenital) — see also Anomaly
- precerebral vessels Q28.1
Alongside this code 5 same parent — Q28
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.