Q99
Header — not billableOther chromosome abnormalities, not elsewhere classified
The ICD-10 code for other chromosome abnormalities, not elsewhere classified is Q99.
Q99 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 5 more specific codes below.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- Q90Down syndromenon-billable header
- Q91Trisomy 18 and Trisomy 13non-billable header
- Q92Other trisomies and partial trisomies of the autosomes, not elsewhere classifiednon-billable header
- Q93Monosomies and deletions from the autosomes, not elsewhere classifiednon-billable header
- Q95Balanced rearrangements and structural markers, not elsewhere classifiednon-billable header
- Q96Turner's syndromenon-billable header
- Q97Other sex chromosome abnormalities, female phenotype, not elsewhere classifiednon-billable header
- Q98Other sex chromosome abnormalities, male phenotype, not elsewhere classifiednon-billable header
- Q99Other chromosome abnormalities, not elsewhere classifiednon-billable header