MCMedicalCodingSoftware
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

No CMS-HCC V28 category: this code does not change a RAF score.

Alphabetic index entries that lead here

  • 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 history

  • deletedFY2024-FY2027

    Other specified chromosome abnormalities

Code to one of these instead Q99.8

2 child codes. Green means billable.

Other codes under Q99

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.