Q91.5 ICD-10-CM Code: Trisomy 13, mosaicism (mitotic nondisjunction)
Q91.5 is the billable ICD-10-CM code for “Trisomy 13, mosaicism (mitotic nondisjunction)” in the FY 2027 U.S. code set, effective Oct 1, 2026.
Official description
Q91.5Trisomy 13, mosaicism (mitotic nondisjunction)
ICD-10-CM diagnosis code · United States clinical modification
Where Q91.5 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 Q91.5
Trisomy 13, mosaicism (mitotic nondisjunction)
Notes for this code
Inclusion terms
No inclusion terms are listed for Q91.5.
Code first
No “code first” instruction is listed for Q91.5.
Use additional code
No “use additional code” instruction is listed for Q91.5.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for Q91.5.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for Q91.5.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
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.
Frequently asked questions
What does ICD-10-CM code Q91.5 mean?
Q91.5 is the FY 2027 U.S. ICD-10-CM code for “Trisomy 13, mosaicism (mitotic nondisjunction).”
Is Q91.5 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, Q91.5 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is Q91.5 located in ICD-10-CM?
Q91.5 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 Q91.5?
No inclusion terms are listed for Q91.5 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.