Q99
Q99: Other chromosome abnormalities, not elsewhere classified
Non-billable headerICD-10-CM
Q99 is a non-billable header ICD-10-CM code for other chromosome abnormalities, not elsewhere classified. It cannot be billed on its own: choose one of the more specific child codes below.
Other codes that can never be billed with Q99
Their own Excludes1 notes name this code, so the conflict is not listed above.
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead Q99
5 child codes. Green means billable.