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

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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