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Q99

Non-billable

Other chromosome abnormalities, not elsewhere classified

Q99 is the ICD-10-CM code for Other chromosome abnormalities, not elsewhere classified. It is a non-billable category code — use a more specific child code such as Q99.0 for billing.

Status
Header (non-billable)
Chapter
Q00-Q99
Subcodes
5
Edition
FY2026

Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code Q99?
Q99 is the ICD-10-CM code for "Other chromosome abnormalities, not elsewhere classified". It falls under Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities.
Is Q99 a billable code?
No — Q99 is a non-billable header code. Use a more specific child code (such as Q99.0) for billing.
What are the subcodes of Q99?
Q99 has 5 more specific child codes, including Q99.0, Q99.1, Q99.2.

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

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