Q91.0 – Trisomy 18, nonmosaicism (meiotic nondisjunction)

ICD-10-CM 2027 diagnosis code · Chromosomal abnormalities, not elsewhere classified

Billable code

ICD-10-CM code Q91.0

Code: Q91.0 (claims format: Q910)
Description: Trisomy 18, nonmosaicism (meiotic nondisjunction)
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
Block: Q90-Q99 Chromosomal abnormalities, not elsewhere classified
Parent codes: Q91

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block Q90-Q99

Excludes2 (not included here):

mitochondrial metabolic disorders (E88.4-)

Index terms for Q91.0

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in Q91

Q91.1 – Trisomy 18, mosaicism (mitotic nondisjunction)Billable
Q91.2 – Trisomy 18, translocationBillable
Q91.3 – Trisomy 18, unspecifiedBillable
Q91.4 – Trisomy 13, nonmosaicism (meiotic nondisjunction)Billable
Q91.5 – Trisomy 13, mosaicism (mitotic nondisjunction)Billable
Q91.6 – Trisomy 13, translocationBillable
Q91.7 – Trisomy 13, unspecifiedBillable

Frequently asked questions

What is ICD-10 code Q91.0?

Q91.0 is the ICD-10-CM code for trisomy 18, nonmosaicism (meiotic nondisjunction), in the block Q90-Q99 (Chromosomal abnormalities, not elsewhere classified).

Is Q91.0 a billable code?

Yes. Q91.0 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does Q91.0 belong to?

It belongs to category Q91 – Trisomy 18 and Trisomy 13.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.