Q99.8

Other specified chromosome abnormalities

Not billable — category only FY2026 2025-10-01 → 2026-09-30

Exclusions 1 never code together

Excludes2

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes

No further instructional notes apply.

Index entries leading here 5

Abnormal, abnormality, abnormalities — see also Anomaly
- chromosome, chromosomal Q99.9
  - sex Q99.8
  - specified NEC Q99.8
Additional — see also Accessory
- chromosome (s) Q99.8
Anomaly, anomalous (congenital) (unspecified type) Q89.9
- chromosomes, chromosomal Q99.9
  - specified NEC Q99.8
Syndrome — see also Disease
- due to abnormality
  - chromosomal Q99.9
    - specified NEC Q99.8
Translocation
- chromosomes NEC Q99.8

Alongside this code 4 same parent — Q99

Subordinate codes 2

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Maps to no condition category in any loaded model.

Presence is a property of the code. Untick a model to hide it everywhere.

Present FY2024–FY2027.