ICD10 code of Johanson-Blizzard syndrome and ICD9 code

Johanson-Blizzard syndrome is classified under the ICD-10-CM code Q87.89, which covers other specified congenital malformation syndromes not elsewhere classified. In the older ICD-9-CM classification system, Johanson-Blizzard syndrome is represented by the code 759.89, which also refers to other specified congenital anomalies.

What is the clinical presentation of Johanson-Blizzard syndrome?

Johanson-Blizzard syndrome is a rare, autosomal recessive multisystem disorder characterized by a distinct constellation of clinical features. Patients typically present with exocrine pancreatic insufficiency, which leads to malabsorption, failure to thrive, and chronic diarrhea. A hallmark feature of Johanson-Blizzard syndrome is the "beak-shaped" nose caused by hypoplasia of the alae nasi. Other common clinical findings include scalp defects (aplasia cutis), permanent teeth abnormalities, microcephaly, and sensorineural hearing loss. Because Johanson-Blizzard syndrome affects multiple organ systems, clinical management requires a coordinated, multidisciplinary approach to address both physical health and developmental needs.

How is Johanson-Blizzard syndrome diagnosed and managed?

Diagnosis of Johanson-Blizzard syndrome is primarily clinical, based on the presence of the characteristic features mentioned above. Genetic testing is the gold standard for confirmation, specifically looking for pathogenic variants in the UBR1 gene. Because Johanson-Blizzard syndrome is a rare condition, diagnostic journeys can be long and isolating. Clinicians typically manage the condition by focusing on supportive care, including pancreatic enzyme replacement therapy for malabsorption, hearing aids for sensorineural hearing loss, and specialized dental care. Monitoring for endocrine deficiencies, such as hypothyroidism or diabetes mellitus, is also a critical component of long-term care.

Is Johanson-Blizzard syndrome hereditary?

Yes, Johanson-Blizzard syndrome follows an autosomal recessive inheritance pattern. This means that an affected individual must inherit one pathogenic mutation in the UBR1 gene from each parent. When both parents are carriers of the gene mutation, there is a 25% chance with each pregnancy that the child will be born with the syndrome. Genetic counseling is highly recommended for families affected by Johanson-Blizzard syndrome to understand the recurrence risks and available reproductive options.

Key facts about Johanson-Blizzard syndrome

• Genetic Cause: Mutations in the UBR1 gene, which encodes an E3 ubiquitin ligase.


• Prevalence: Extremely rare; fewer than 100 cases have been reported in medical literature worldwide.


• Primary Symptom: Exocrine pancreatic insufficiency occurs in nearly all diagnosed patients.


• Physical Hallmark: The characteristic "beak-shaped" nose is considered a diagnostic clinical indicator.


• Community Support: Currently, 1 individual in the DiseaseMaps community has identified as having Johanson-Blizzard syndrome, highlighting the rarity of the condition.

Next steps

• Consult with a clinical geneticist to confirm the diagnosis through UBR1 gene sequencing.


• Establish care with a multidisciplinary team including a pediatric gastroenterologist, endocrinologist, and audiologist.


• Connect with rare disease advocacy groups to find support and share experiences with the global Johanson-Blizzard syndrome community.


• Register with specialized patient registries to stay informed about potential clinical trials or research initiatives.

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

References

• Orphanet: Johanson-Blizzard syndrome (ORPHA:471)


• NIH Genetic and Rare Diseases (GARD) Information Center: Johanson-Blizzard syndrome


• OMIM (Online Mendelian Inheritance in Man): Johanson-Blizzard syndrome (#243800)


• PubMed: Clinical and molecular characterization of patients with Johanson-Blizzard syndrome