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Q99.8

Non-billable

Other specified chromosome abnormalities

Q99.8 is the ICD-10-CM code for Other specified chromosome abnormalities. It is a non-billable category code — use a more specific child code such as Q99.81 for billing.

Status
Header (non-billable)
Chapter
Q00-Q99
Parent
Q99
Subcodes
2
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 ↗

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 Q99.8?
Q99.8 is the ICD-10-CM code for "Other specified chromosome abnormalities". It falls under Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities.
Is Q99.8 a billable code?
No — Q99.8 is a non-billable header code. Use a more specific child code (such as Q99.81) for billing.
What are the subcodes of Q99.8?
Q99.8 has 2 more specific child codes, including Q99.81, Q99.89.

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

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