ICD10 code of Simpson-Golabi-Behmel syndrome and ICD9 code

Simpson-Golabi-Behmel syndrome is classified under the ICD-10 code Q87.3, which refers to congenital malformation syndromes involving overgrowth. While ICD-9 codes are largely deprecated in clinical practice, it was historically categorized under 759.89, representing other specified congenital anomaly syndromes.

What is Simpson-Golabi-Behmel syndrome?

Simpson-Golabi-Behmel syndrome (SGBS) is a rare X-linked overgrowth disorder characterized by distinct facial features, prenatal and postnatal macrosomia (excessive growth), and an increased risk of developing certain embryonal tumors. Because Simpson-Golabi-Behmel syndrome is primarily caused by mutations or deletions in the GPC3 gene on the X chromosome, it predominantly affects males, though females can occasionally manifest milder symptoms due to skewed X-inactivation. Currently, 26 members within the DiseaseMaps community have shared their experiences living with or caring for someone with this condition, highlighting the importance of specialized, multidisciplinary medical management.

How is Simpson-Golabi-Behmel syndrome diagnosed?

Diagnosis of Simpson-Golabi-Behmel syndrome often begins with a clinical evaluation by a geneticist who observes the characteristic physical findings, such as macrocephaly, coarse facial features (including a wide mouth and upturned nose), and skeletal anomalies. Because the clinical presentation of Simpson-Golabi-Behmel syndrome can overlap with other overgrowth syndromes like Beckwith-Wiedemann syndrome, molecular genetic testing is essential for a definitive diagnosis. This testing typically involves sequencing the GPC3 gene or performing chromosomal microarray analysis to detect deletions.

What are the key clinical features of Simpson-Golabi-Behmel syndrome?

The clinical manifestations of Simpson-Golabi-Behmel syndrome are broad and can vary significantly even among affected family members. Clinicians monitor patients for specific, high-priority health risks associated with the syndrome:

• Tumor surveillance: An increased risk of embryonal tumors, most notably Wilms tumor and hepatoblastoma, necessitating regular abdominal ultrasound screenings during childhood.


• Skeletal and Craniofacial traits: Macrocephaly, polydactyly, syndactyly, and a distinctive "coarse" facial appearance.


• Cardiac anomalies: Structural heart defects, which require periodic echocardiograms.


• Developmental needs: Potential for intellectual disability or developmental delay, requiring early intervention services and individualized educational support.


• Organomegaly: Enlargement of internal organs, particularly the liver, spleen, and kidneys.

Is Simpson-Golabi-Behmel syndrome hereditary?

Yes, Simpson-Golabi-Behmel syndrome is inherited in an X-linked recessive pattern. This means that a mother who carries the mutation has a 50% chance of passing it to her sons, who will be affected, and a 50% chance of passing it to her daughters, who will be carriers. However, many cases of Simpson-Golabi-Behmel syndrome occur due to a *de novo* (new) mutation in the affected individual, meaning there is no family history of the condition. Genetic counseling is strongly recommended for families to understand the recurrence risks and available reproductive options.

Next steps

• Consult with a clinical geneticist to confirm the diagnosis through molecular testing.


• Establish a tumor surveillance protocol with a pediatric oncologist or geneticist to monitor for associated malignancies.


• Connect with the 26 members of the DiseaseMaps community to share experiences and coping strategies for managing the long-term care of Simpson-Golabi-Behmel syndrome.


• Schedule regular follow-ups with a multidisciplinary team, including cardiologists, orthopedists, and developmental pediatricians.

Medical disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases (GARD) Information Center: Simpson-Golabi-Behmel syndrome overview.


• Orphanet: Portal for rare diseases and orphan drugs (ORPHA:3335).


• OMIM (Online Mendelian Inheritance in Man): Entry #312870 (Simpson-Golabi-Behmel Syndrome).


• PubMed/NCBI: Clinical literature on GPC3-related overgrowth syndromes.