Q91
⚠ Non-billable
Trisomy 18 and Trisomy 13
ICD-10-CM · FY2026 · Congenital Malformations, Deformations and Chromosomal Abnormalities
Code
Q91
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Congenital Malformations, Deformations and Chromosomal Abnormalities
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code Q91?
ICD-10-CM code Q91 represents Trisomy 18 and Trisomy 13. It is a non-billable header code requiring a more specific subcategory in the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter, effective October 1, 2025 – September 30, 2026.
Is Q91 billable?
No. Q91 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is Q91 in?
Q91 belongs to the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter (Q00–Q99) of ICD-10-CM.
Related codes in the Q91 category
Q91.0
Trisomy 18, nonmosaicism (meiotic nondisjunction)
Billable
Q91.1
Trisomy 18, mosaicism (mitotic nondisjunction)
Billable
Q91.2
Trisomy 18, translocation
Billable
Q91.3
Trisomy 18, unspecified
Billable
Q91.4
Trisomy 13, nonmosaicism (meiotic nondisjunction)
Billable
Q91.5
Trisomy 13, mosaicism (mitotic nondisjunction)
Billable
Q91.6
Trisomy 13, translocation
Billable
Q91.7
Trisomy 13, unspecified
Billable
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