Q90-Q99 ICD-10-CA block: Chromosomal abnormalities, not elsewhere classified
Q90-Q99 isn’t a code on its own. Choose one of the 68 codes beneath it, the one the documentation supports.
Official description
Q90-Q99Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
ICD-10-CA · Canada
Codes in Q90-Q99
Q90-Q99 isn’t a code on its own. Open the group that matches what the note documents.
Q90Down's syndrome (4 codes)Q91Edwards' syndrome and Patau's syndrome (8 codes)Q92Other trisomies and partial trisomies of the autosomes, not elsewhere classified (10 codes)Q93Monosomies and deletions from the autosomes, not elsewhere classified (10 codes)Q95Balanced rearrangements and structural markers, not elsewhere classified (8 codes)Q96Turner's syndrome (7 codes)Q97Other sex chromosome abnormalities, female phenotype, not elsewhere classified (6 codes)Q98Other sex chromosome abnormalities, male phenotype, not elsewhere classified (10 codes)Q99Other chromosome abnormalities, not elsewhere classified (5 codes)Notes for Q90-Q99
As CIHI prints them, with any note Q90-Q99 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- Inborn errors of metabolism (E70-E90)From Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
Where Q90-Q99 sits
- 1ChapterChapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- 2Block Q90-Q99Chromosomal abnormalities, not elsewhere classified
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
Is Q90-Q99 a valid ICD-10-CA code?
No. Q90-Q99 (Chromosomal abnormalities, not elsewhere classified) is a block heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 68 codes; record the one the documentation supports.
Where is Q90-Q99 in ICD-10-CA?
Q90-Q99 sits under Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99).
What coding notes apply to Q90-Q99?
ICD-10-CA lists Excludes notes for Q90-Q99, 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.
Codes beside Q90-Q99
Q00-Q07Congenital malformations of the nervous systemQ10-Q18Congenital malformations of eye, ear, face and neckQ20-Q28Congenital malformations of the circulatory systemQ30-Q34Congenital malformations of the respiratory systemQ35-Q37Cleft lip and cleft palateQ38-Q45Other congenital malformations of the digestive systemQ50-Q56Congenital malformations of genital organsQ60-Q64Congenital malformations of the urinary systemQ65-Q79Congenital malformations and deformations of the musculoskeletal systemQ80-Q89Other congenital malformations