Q28.1 ICD-10-CA code: Other malformations of precerebral vessels
Q28.1 is the ICD-10-CA code for “Other malformations of precerebral vessels” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
Q28.1Other malformations of precerebral vessels
Short description: Oth malformations of precerebral vessels
ICD-10-CA · Canada · Also written Q281
Index terms
Entries in CIHI’s alphabetical index that lead to Q28.1. Searching the index by the condition the note names is how coders reach this code.
- Distribution vessel, atypical, precerebral
- Malformation (congenital), precerebral vessels
- Dissection, artery NEC, precerebral NEC, congenital (nonruptured)
- Anomaly, anomalous (congenital) (unspecified type), precerebral vessel
- Anomaly, anomalous (congenital) (unspecified type), vessel(s), precerebral
- Anomaly, anomalous (congenital) (unspecified type), artery (peripheral), basilar NEC
- Anomaly, anomalous (congenital) (unspecified type), artery (peripheral), vertebral NEC
- Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular), precerebral NEC, congenital (nonruptured)
Notes for Q28.1
As CIHI prints them, with any note Q28.1 takes from the headings above it.
Includes
- Congenital:• malformation of precerebral vessels NOS• precerebral aneurysm (nonruptured)
Excludes
Conditions classified elsewhere.
- Congenital aneurysm:• NOS (Q27.8)• coronary (Q24.5)• peripheral (Q27.8)• pulmonary (Q25.7)• retinal (Q14.1)ruptured:• cerebral arteriovenous malformation (I60.8)• malformation of precerebral vessels (I72.-)From Q28 Other congenital malformations of circulatory system
- Inborn errors of metabolism (E70-E90)From Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
Where Q28.1 sits
- 1ChapterChapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- 2Block Q20-Q28Congenital malformations of the circulatory system
- 3Category Q28Other congenital malformations of circulatory system
- 4Valid code Q28.1Other malformations of precerebral vessels
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code Q28.1 mean?
Q28.1 is the ICD-10-CA code for “Other malformations of precerebral vessels” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is Q28.1 in ICD-10-CA?
Q28.1 sits under Q28 Other congenital malformations of circulatory system, within Q20-Q28 Congenital malformations of the circulatory system, within Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99).
What coding notes apply to Q28.1?
ICD-10-CA lists Includes, Excludes notes for Q28.1, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.