Male with sex chromosome mosaicism

This code describes a male individual who possesses two or more distinct cell lines, each with a different sex chromosome constitution. This typically involves variations such as 45,X/46,XY or 46,XX/46,XY, where some cells have a normal male karyotype while others have an abnormal or different sex chromosome complement. The clinical presentation can be highly variable, ranging from ambiguous genitalia and infertility to subtle phenotypic differences.

This code is appropriate for documenting a diagnosis of sex chromosome mosaicism in a male patient, confirmed through cytogenetic analysis. It should be used when the patient's karyotype reveals the presence of multiple cell lines with differing sex chromosome compositions. Documentation supporting this code includes genetic testing reports, karyotype results, and clinical notes detailing the mosaicism.

• Ensure documentation clearly specifies the patient's sex as male and confirms the mosaicism through genetic testing.
• Do not confuse this with non-mosaic sex chromosome disorders (e.g., Klinefelter syndrome, 47,XXY) unless mosaicism is also present.
• Code any associated congenital anomalies or clinical manifestations separately, as this code only describes the genetic condition.