Q91 ICD-10-CM Code: Trisomy 18 and Trisomy 13
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
Q91Trisomy 18 and Trisomy 13
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where Q91 sits
- 1
Chapter 17
Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
- 2
Section
Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
- 3
Category Q91
Trisomy 18 and Trisomy 13
- 4
Code Q91
Trisomy 18 and Trisomy 13
More specific choices
Codes under Q91
Q91 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Q91.0Trisomy 18, nonmosaicism (meiotic nondisjunction)
Q91.1Trisomy 18, mosaicism (mitotic nondisjunction)
Q91.2Trisomy 18, translocation
Q91.3Trisomy 18, unspecified
Q91.4Trisomy 13, nonmosaicism (meiotic nondisjunction)
Q91.5Trisomy 13, mosaicism (mitotic nondisjunction)
Q91.6Trisomy 13, translocation
Q91.7Trisomy 13, unspecified
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for Q91.
Code first
No “code first” instruction is listed for Q91.
Use additional code
No “use additional code” instruction is listed for Q91.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for Q91.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for Q91.
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code Q91 mean?
Q91 is the FY 2027 U.S. ICD-10-CM code for “Trisomy 18 and Trisomy 13.”
Is Q91 a billable or specific ICD-10-CM code?
No. Q91 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is Q91 located in ICD-10-CM?
Q91 is listed in Chapter 17, Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1), within Chromosomal abnormalities, not elsewhere classified (Q90-Q99) (Q90–Q99), under category Q91, Trisomy 18 and Trisomy 13.
What coding notes are listed for Q91?
No inclusion terms are listed for Q91 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.
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