ICD10 code of Down Syndrome and ICD9 code

The primary ICD-10 code for Down syndrome is Q90, with specific sub-classifications including Q90.0 for Trisomy 21 (meiotic nondisjunction), Q90.1 for Trisomy 21 (mosaicism), and Q90.2 for Trisomy 21 (translocation). Under the older ICD-9-CM classification system, Down syndrome is coded as 758.0.

What exactly is the clinical classification of Down syndrome?

Down syndrome is a chromosomal condition that occurs when an individual has a full or partial extra copy of chromosome 21. Clinically, it is categorized by these ICD-10 codes to assist healthcare providers in billing, tracking, and identifying the specific genetic mechanism involved. While the diagnosis is defined by the presence of this extra genetic material, the manifestation of Down syndrome varies significantly between individuals, necessitating a personalized approach to care and monitoring.

How is Down syndrome diagnosed and coded?

Diagnosis usually occurs prenatally through screening and diagnostic tests (such as amniocentesis or chorionic villus sampling) or postnatally through a physical examination and a chromosomal karyotype. Once confirmed, the specific ICD-10 code is assigned based on the genetic etiology:

• Q90.0: Trisomy 21, non-mosaic (meiotic nondisjunction), which accounts for approximately 95% of Down syndrome cases.


• Q90.1: Trisomy 21, mosaic (mitotic nondisjunction), occurring in about 1-2% of cases.


• Q90.2: Trisomy 21, translocation, accounting for approximately 3-4% of Down syndrome cases.


• Q90.9: Down syndrome, unspecified.

Is Down syndrome hereditary?

In the vast majority of cases, Down syndrome is not inherited; it is the result of a random event during the formation of reproductive cells (eggs or sperm) or early fetal development. However, in the case of translocation Down syndrome (Q90.2), one parent may be a carrier of a balanced translocation, which can be passed to the child. A clinical geneticist can perform parental karyotyping to determine if an inherited translocation is present, providing vital information for family planning.

How can the DiseaseMaps community support those with Down syndrome?

Navigating the medical system requires both accurate coding and a strong support network. At DiseaseMaps.org, we currently have 24 community members who have shared their experiences with Down syndrome. Connecting with others who understand the unique therapeutic, educational, and medical needs of individuals with this condition can reduce isolation and provide practical insights into managing long-term health, such as routine screenings for congenital heart defects, thyroid dysfunction, and hearing or vision impairments.

Next steps

• Consult a clinical geneticist to confirm the specific chromosomal mechanism of Down syndrome for your family records.


• Ensure your medical records utilize the correct ICD-10 code to facilitate insurance coverage for necessary therapies and regular health check-ups.


• Join the Down syndrome community on DiseaseMaps.org to share resources and connect with other families.


• Establish a care team that includes a primary care physician, a cardiologist, and an early intervention specialist.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Down Syndrome Overview


• Orphanet: Trisomy 21 (ORPHA:870)


• Online Mendelian Inheritance in Man (OMIM): Down Syndrome (Entry #190685)


• World Health Organization (WHO): ICD-10 Version:2019 (Q90)