Q99.8
Q99.8 — Other specified chromosome abnormalities
Non-billable headerICD-10-CM
Q99.8 is a non-billable header ICD-10-CM code for other specified chromosome abnormalities. It cannot be billed on its own: choose one of the more specific child codes below.
Risk adjustment
Q99.8 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
How Q99.8 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to Q99.8.
- Additional›chromosome(s)
- Translocation›chromosomes NEC
- Abnormal, abnormality, abnormalities›chromosome, chromosomal›sex
- Abnormal, abnormality, abnormalities›chromosome, chromosomal›specified NEC
- Anomaly, anomalous›chromosomes, chromosomal›specified NEC
- Syndrome›due to abnormality›chromosomal›specified NEC
Code to one of these instead Q99.8
2 child codes. Green means billable.
Related codes at this level
Codes that share Q99. If Q99.8 is not quite right, the correct code is usually one of these.
Questions about Q99.8
- Is Q99.8 a billable ICD-10-CM code?
- No. Q99.8 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does Q99.8 sit in the tabular list?
- Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Chromosomal abnormalities, not elsewhere classified (Q90-Q99).