Q99: Other chromosome abnormalities, not elsewhere classified
Q99.0: Chimera 46,XX/46,XY
The X chromosome and the Y chromosome determine a person’s biological gender. Men normally have one X chromosome and one Y chromosome. Women normally have 2 X chromosomes.
In part of your body cells there is one X and one Y chromosome. In another part of your body cells there are 2 X chromosomes.
The reason for this lies in fertilization. A child usually comes into being when an egg is fertilized by a sperm. However, a child may develop from two fertilized eggs. One of the two fertilized eggs contains male sex hormones. The other of the two eggs contains female sex hormones. The child therefore has cells with both male sex chromosomes and cells with female sex chromosomes from the start.
Due to the different sex chromosomes, the sex organs may then develop differently than usual. Both testes and ovaries may be present. The external sex organs may look different than for most other people. During puberty, male and female sex characteristics can develop. You may not be able to have children during your lifetime.
Patient Disclaimer
The information provided on this page is for general educational purposes only. It is not intended for self-diagnosis and does not replace professional medical advice. Always consult your doctor or a qualified healthcare provider with any questions or concerns about your health.
If you see an ICD diagnosis code (e.g., on a medical report), be aware that doctors may also include additional indicators to express diagnostic certainty. Only a healthcare professional can interpret these codes accurately in the context of your individual case.
For a complete understanding of your condition and what the diagnosis means for you, please speak directly with your doctor.