Q90-Q99 — Chromosomal abnormalities, not elsewhere classified
ICD-10-CM codes Q90-Q99 cover chromosomal abnormalities, not elsewhere classified, within congenital malformations, deformations and chromosomal abnormalities. The block holds 88 codes across 9 categories, of which 74 are billable and 14 are header codes that cannot be submitted on a claim.
Excludes2 — not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
- mitochondrial metabolic disorders (E88.4-)
What else to watch in Q90-Q99
- 21 codes are named in Medicare coverage policies. An LCD or NCD lists them as supporting medical necessity, or explicitly as not supporting it. Which applies depends on the MAC for your state.
Categories in Q90-Q99
- Q90Down syndrome
- Q91Trisomy 18 and Trisomy 13
- Q92Other trisomies and partial trisomies of the autosomes, not elsewhere classified
- Q93Monosomies and deletions from the autosomes, not elsewhere classified
- Q95Balanced rearrangements and structural markers, not elsewhere classified
- Q96Turner's syndrome
- Q97Other sex chromosome abnormalities, female phenotype, not elsewhere classified
- Q98Other sex chromosome abnormalities, male phenotype, not elsewhere classified
- Q99Other chromosome abnormalities, not elsewhere classified