Short answer · Medically reviewed summary · Last updated: 2026-05-08
Trisomy X, also known as 47,XXX syndrome, is classified under the ICD-10 code Q97.0 (Karyotype 47,XXX) and the ICD-9 code 758.89 (Other conditions due to chromosomal anomalies). These codes are used by healthcare providers and insurance systems to specifically identify and document this chromosomal variation in medical records. What is the clinical definition of Trisomy X? Trisomy X is a genetic condition characterized by the presence of an extra X chromosome in each of a female's cells.
Trisomy X, also known as 47,XXX syndrome, is classified under the ICD-10 code Q97.0 (Karyotype 47,XXX) and the ICD-9 code 758.89 (Other conditions due to chromosomal anomalies). These codes are used by healthcare providers and insurance systems to specifically identify and document this chromosomal variation in medical records.
Trisomy X is a genetic condition characterized by the presence of an extra X chromosome in each of a female's cells. While many individuals with Trisomy X may have no symptoms or only mild physical differences, others may experience variations in development or learning. It occurs in approximately 1 in 1,000 live female births, and our DiseaseMaps.org community currently includes 12 individuals who have shared their personal experiences with the condition.
Diagnosis of Trisomy X is typically confirmed through a chromosomal analysis known as a karyotype, which examines the number and structure of chromosomes. Because many individuals with Trisomy X have few or no physical indicators, the condition is often diagnosed incidentally during prenatal testing (such as amniocentesis or NIPT) or later in life during evaluations for developmental or learning concerns.
While every individual is unique, clinical literature identifies several common traits that may be associated with Trisomy X:
Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment from a qualified healthcare provider.