ICD10 code of Holoprosencephaly and ICD9 code

Holoprosencephaly is primarily classified under the ICD-10 code Q04.2 (Holoprosencephaly), while the historical ICD-9 code for this condition is 742.2. These diagnostic codes are essential for medical documentation, insurance billing, and tracking the clinical progression of Holoprosencephaly within healthcare systems.

What exactly is Holoprosencephaly?

Holoprosencephaly is a complex structural brain malformation occurring during early embryonic development, specifically between the 18th and 28th days of gestation. It occurs when the prosencephalon (the embryonic forebrain) fails to divide properly into the right and left hemispheres. Because the brain development is closely linked to facial development, Holoprosencephaly often presents with distinctive craniofacial features, ranging from mild to severe.

How is the severity of Holoprosencephaly classified?

Clinicians typically categorize Holoprosencephaly into three main degrees of severity based on the extent of brain cleavage:

• Alobar: The most severe form, where there is no separation of the hemispheres and a single ventricular cavity.


• Semilobar: Partial separation of the hemispheres, usually in the posterior regions of the brain.


• Lobar: The mildest form, where the hemispheres are largely separated, though some frontal lobe fusion persists.

Is Holoprosencephaly genetic or hereditary?

The etiology of Holoprosencephaly is highly heterogeneous. While it can be caused by chromosomal abnormalities (such as Trisomy 13) or specific gene mutations (like SHH, ZIC2, or SIX3), it can also be associated with maternal diabetes or teratogenic exposures. A clinical geneticist can help determine if the form of Holoprosencephaly observed in a specific case is inherited in an autosomal dominant or recessive pattern.

Next steps

• Consult with a pediatric neurologist and a clinical geneticist to discuss recurrence risks and specialized care plans.


• Connect with the 10 members of the DiseaseMaps.org community who are navigating Holoprosencephaly to share experiences and coping strategies.


• Review resources provided by the NIH Genetic and Rare Diseases Information Center (GARD) for the latest clinical trial information.

Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Holoprosencephaly overview.


• Orphanet (ORPHA: 407): Holoprosencephaly classification and clinical data.


• OMIM (Online Mendelian Inheritance in Man): Entry #236100 regarding the genetic basis of Holoprosencephaly.


• World Health Organization (WHO): ICD-10 and ICD-11 coding standards for congenital malformations.