X-linked ichthyosis

This code identifies a genetic skin disorder characterized by generalized scaling, particularly noticeable on the neck, trunk, and extremities. It is caused by a deficiency of steroid sulfatase, an enzyme involved in skin barrier function, and primarily affects males due to its X-linked inheritance pattern.

Assign this code for patients diagnosed with X-linked ichthyosis, often presenting with dark, adherent scales that may worsen in colder, drier climates. Documentation should clearly state the diagnosis of X-linked ichthyosis, potentially supported by genetic testing results confirming the STS gene mutation.

• Differentiate from other forms of ichthyosis; ensure documentation specifies "X-linked."
• Code any associated conditions, such as corneal opacities or cryptorchidism, separately.
• Review genetic testing reports or physician notes confirming the specific type of ichthyosis.