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Q91

Non-billable

Trisomy 18 and Trisomy 13

Q91 is the ICD-10-CM code for Trisomy 18 and Trisomy 13. It is a non-billable category code — use a more specific child code such as Q91.0 for billing.

Status
Header (non-billable)
Chapter
Q00-Q99
Subcodes
8
Edition
FY2026

Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities

What this means — in plain language

MedlinePlus · NIH

What are genetic disorders? Genetic disorders are health conditions caused by changes (also called mutations or variants) in your genes. Genes are parts of DNA found in your cells that carry instructions for how your body grows, develops, and functions. Many genes tell your body how to make proteins, which are needed for your body to work properly. What causes genetic disorders? A genetic disorder happens when a…

Read more about Genetic Disorders at MedlinePlus ↗
Trisomy 18 ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code Q91?
Q91 is the ICD-10-CM code for "Trisomy 18 and Trisomy 13". It falls under Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities.
Is Q91 a billable code?
No — Q91 is a non-billable header code. Use a more specific child code (such as Q91.0) for billing.
What are the subcodes of Q91?
Q91 has 8 more specific child codes, including Q91.0, Q91.1, Q91.2.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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