ICD10 code of EAST syndrome and ICD9 code

TL;DR: EAST syndrome, also known as SESAME syndrome, does not have its own unique, dedicated ICD-10 or ICD-9 code. Clinicians typically use broader coding categories for electrolyte imbalances or specific symptoms, such as E87.6 (hypokalemia) or Q87.89 (other specified congenital malformation syndromes), to document the clinical manifestations of this rare disorder.

What is EAST syndrome and how is it classified?

EAST syndrome is a rare, multisystem genetic disorder characterized by the acronym: Epilepsy, Ataxia, Sensorineural deafness, and Tubulopathy. Because EAST syndrome is extremely rare—with fewer than 50 cases reported in global medical literature—it has not been assigned a specific, dedicated diagnostic code in the International Classification of Diseases (ICD) systems. When managing EAST syndrome, physicians must rely on "symptom-based" coding to ensure accurate billing and medical record documentation. This means that while a patient carries a diagnosis of EAST syndrome, their medical charts will reflect the individual components of the disease, such as renal tubular acidosis or hearing loss.

How is the diagnosis of EAST syndrome confirmed?

The definitive diagnosis of EAST syndrome is achieved through molecular genetic testing. The condition is caused by pathogenic variants in the KCNJ10 gene, which encodes the Kir4.1 potassium channel. This channel is crucial for potassium regulation in the brain, inner ear, and kidneys. Clinical confirmation of EAST syndrome typically involves the following diagnostic steps:

• Genetic Testing: Targeted gene sequencing or multi-gene panel testing to identify biallelic mutations in the KCNJ10 gene.


• Renal Evaluation: Monitoring for hypokalemic metabolic alkalosis and salt-wasting nephropathy, which are hallmarks of the tubulopathy seen in EAST syndrome.


• Neurological Assessment: EEG monitoring to assess epilepsy and clinical evaluation for ataxia (balance and coordination issues).


• Audiological Testing: Formal hearing evaluation to detect sensorineural hearing loss.

Is EAST syndrome hereditary?

Yes, EAST syndrome is an inherited condition with an autosomal recessive pattern of inheritance. This means that an individual must inherit two copies of the mutated KCNJ10 gene—one from each parent—to manifest the full spectrum of symptoms. Parents of a child with EAST syndrome are typically asymptomatic carriers, each possessing one mutated gene and one functional gene. Genetic counseling is strongly recommended for families affected by EAST syndrome to discuss the 25% recurrence risk for future pregnancies.

Finding support for EAST syndrome

Living with an ultra-rare diagnosis can feel isolating, but you are not alone. Currently, there is one member within the DiseaseMaps.org community who has shared their experience with EAST syndrome, providing a vital point of connection for those navigating this complex journey. Connecting with rare disease communities can provide emotional support and help share practical strategies for managing the diverse symptoms of the condition.

Next steps

• Consult with a clinical geneticist to confirm the diagnosis through KCNJ10 gene analysis.


• Coordinate care with a multidisciplinary team, including a pediatric nephrologist, neurologist, and audiologist.


• Reach out to the DiseaseMaps.org community to connect with others who may have experience with rare genetic channelopathies.


• Request a referral to a center of excellence for rare renal or metabolic disorders.

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 or other qualified health provider with any questions regarding a medical condition.

References

• Orphanet: "EAST syndrome" (ORPHA:228414)


• NIH Genetic and Rare Diseases Information Center (GARD): "EAST syndrome"


• Online Mendelian Inheritance in Man (OMIM): Entry #602208 (Seizures, sensorineural deafness, ataxia, mental retardation, and electrolyte imbalance)


• PubMed: "KCNJ10 mutations in EAST/SESAME syndrome" (Clinical case series and literature reviews)