Q99.9 CHROMOSOMAL ABNORMALITY, UNSPECIFIED

Code Information

  • Diagnosis Code: Q99.9
  • Short Description: Chromosomal abnormality, unspecified
  • Long Description: Chromosomal abnormality, unspecified
  • Code Version: 2025 ICD-10-CM

The code Q99.9 is VALID for claim submission

Code Classification

Synonyms

  • Alpha-thalassemia intellectual disability syndrome linked to chromosome 16
  • Anomaly of chromosome pair 1
  • Anomaly of chromosome pair 10
  • Anomaly of chromosome pair 11
  • Anomaly of chromosome pair 12
  • Anomaly of chromosome pair 13
  • Anomaly of chromosome pair 14
  • Anomaly of chromosome pair 15
  • Anomaly of chromosome pair 16
  • Anomaly of chromosome pair 17
  • Anomaly of chromosome pair 18
  • Anomaly of chromosome pair 19
  • Anomaly of chromosome pair 2
  • Anomaly of chromosome pair 20
  • Anomaly of chromosome pair 21
  • Anomaly of chromosome pair 22
  • Anomaly of chromosome pair 3
  • Anomaly of chromosome pair 4
  • Anomaly of chromosome pair 5
  • Anomaly of chromosome pair 6
  • Anomaly of chromosome pair 7
  • Anomaly of chromosome pair 8
  • Anomaly of chromosome pair 9
  • Autoimmune lymphoproliferative syndrome
  • Autoimmune lymphoproliferative syndrome due to CTLA4 haploinsufficiency
  • Autosomal chromosomal disorder
  • Autosomal dominant hereditary disorder
  • Autosomal hereditary disorder
  • Autosomal recessive hereditary disorder
  • Autosomal translocation
  • Cardiac arrhythmia associated with genetic disorder
  • CFTR-related disorder
  • Chromosomal disorder
  • Congenital chromosomal disease
  • Deletion of part of short arm of chromosome 16
  • Dementia due to chromosomal anomaly
  • Dementia due to genetic disease
  • Dominant autosomal hereditary disorder, complete penetrance
  • Dominant autosomal hereditary disorder, incomplete penetrance
  • Genetic disease
  • Immunodeficiency associated with chromosomal abnormality
  • Ulnar mammary syndrome

Crosswalk Information

ICD-10 Code ICD-9 Code ICD-9 Description
Q99.9 Right Arrow 758.9 Chromosome anomaly NOS
This ICD-10 to ICD-9 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-10 Code ICD-10 Description
Q99 Other chromosome abnormalities, not elsewhere classified
Q99.0 Chimera 46, XX/46, XY
Q99.1 46, XX true hermaphrodite
Q99.2 Fragile X chromosome
Q99.8 Other specified chromosome abnormalities
Q99.81 Usher syndrome
Q99.811 Usher syndrome, type 1
Q99.812 Usher syndrome, type 2
Q99.813 Usher syndrome, type 3
Q99.818 Other Usher syndrome
Q99.819 Usher syndrome, unspecified
Q99.89 Other specified chromosome abnormalities
This page was last updated on: 10/1/2025