ICD-10 Diagnosis Code Q99.8

Other specified chromosome abnormalities

Diagnosis Code Q99.8

ICD-10: Q99.8
Short Description: Other specified chromosome abnormalities
Long Description: Other specified chromosome abnormalities
This is the 2018 version of the ICD-10-CM diagnosis code Q99.8

Valid for Submission
The code Q99.8 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
      • Other chromosome abnormalities, not elsewhere classified (Q99)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code Q99.8 is grouped in the following Diagnostic Related Group(s) (MS-DRG V34.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

Present on Admission (POA) Additional informationCallout TooltipPresent on Admission
The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.

The code Q99.8 is exempt from POA reporting.

  • Additional sex chromosome
  • Anomaly of chromosome pair
  • Anomaly of chromosome pair 12
  • Anomaly of chromosome pair 7
  • Anomaly of chromosome pair 9
  • Anomaly of chromosome X
  • Anomaly of chromosome Y
  • Anomaly of sex chromosome
  • Apparent mineralocorticoid excess
  • Ataxia-telangiectasia-like disorder
  • Autosomal aneuploidy
  • Autosomal chromosomal disorder
  • Cardiac arrhythmia associated with genetic disorder
  • Centromeric instability of chromosomes 1,9 and 16 and immunodeficiency
  • Chimera
  • Chromosomal alterations of group A
  • Chromosomal alterations of group B
  • Chromosomal alterations of group C and X
  • Chromosomal alterations of group D
  • Chromosomal alterations of group E
  • Chromosomal alterations of group F
  • Chromosomal alterations of group G and Y
  • Chromosome 18 syndromes and antibody deficiency
  • Chromosome 22 abnormalities with hypogammaglobulinemia
  • Congenital cleft larynx
  • Congenital fissure of larynx
  • Congenital leptin deficiency
  • Deletion of X-chromosome and hypogammaglobulinemia
  • Deoxyribonucleic acid instability syndrome
  • Duplication of chromosome
  • Emberger syndrome
  • Extra unidentified structurally abnormal chromosome
  • Familial idiopathic hypercalciuria
  • Frontotemporal dementia
  • Frontotemporal dementia with gene located on 3p11
  • Genetic short QT syndrome
  • Genetic syndrome
  • Group chromosomal alteration
  • Gynandromorphism syndrome
  • Hereditary disorder by system
  • Hereditary disorder of musculoskeletal system
  • Heterologous chimera
  • Homologous chimera
  • Hypercalciuria
  • Interleukin-1 receptor-associated kinase 4 deficiency
  • Isologous chimera
  • Mendelian disorders
  • Mosaic variegated aneuploidy syndrome
  • Multiple malformation syndrome, moderate short stature, facial
  • Multiple malformation syndrome, moderate short stature, facial
  • Opitz-Frias syndrome
  • Partial tetrasomy 9 syndrome
  • Poly Y syndrome
  • Polygenic hereditary disorder
  • Radiation chimera
  • Sex-linked hereditary disorder
  • Short QT syndrome
  • Supernumerary der
  • Symptomatic disorders of the urinary tract
  • Tetrasomy 12p
  • Tetrasomy 18p
  • Unbalanced translocation and insertion
  • Unbalanced translocation of chromosome
  • Williams syndrome
  • X-linked hereditary disease

Information for Patients

Genetic Disorders

Genes are the building blocks of heredity. They are passed from parent to child. They hold DNA, the instructions for making proteins. Proteins do most of the work in cells. They move molecules from one place to another, build structures, break down toxins, and do many other maintenance jobs.

Sometimes there is a mutation, a change in a gene or genes. The mutation changes the gene's instructions for making a protein, so the protein does not work properly or is missing entirely. This can cause a medical condition called a genetic disorder.

You can inherit a gene mutation from one or both parents. A mutation can also happen during your lifetime.

There are three types of genetic disorders:

  • Single-gene disorders, where a mutation affects one gene. Sickle cell anemia is an example.
  • Chromosomal disorders, where chromosomes (or parts of chromosomes) are missing or changed. Chromosomes are the structures that hold our genes. Down syndrome is a chromosomal disorder.
  • Complex disorders, where there are mutations in two or more genes. Often your lifestyle and environment also play a role. Colon cancer is an example.

Genetic tests on blood and other tissue can identify genetic disorders.

NIH: National Library of Medicine

  • Genetics (Medical Encyclopedia)

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