ICD10 code of Noonan Syndrome and ICD9 code

The primary ICD-10-CM code for Noonan syndrome is Q87.1 (Congenital malformation syndromes predominantly associated with short stature). In the legacy ICD-9-CM coding system, Noonan syndrome was typically classified under the code 759.89 (Other specified congenital anomalies).

What exactly is Noonan syndrome?

Noonan syndrome is a multisystem genetic disorder characterized by distinctive facial features, short stature, congenital heart defects, and variable developmental delays. It is caused by pathogenic variants in genes involved in the RAS/MAPK signaling pathway, which is essential for normal cell division and growth. Because Noonan syndrome presents with such a wide spectrum of severity, clinical presentation can vary significantly even among members of the same family. At DiseaseMaps.org, 118 people with Noonan syndrome have joined our community to share their lived experiences and navigate the complexities of managing this condition together.

How is Noonan syndrome diagnosed and coded?

Diagnosis of Noonan syndrome is primarily clinical, based on a scoring system developed by van der Burgt. Molecular genetic testing is then used to confirm the diagnosis by identifying a causative variant in one of the associated genes, such as PTPN11, SOS1, or RAF1. While the ICD-10-CM code Q87.1 is the standard for Noonan syndrome, clinicians often use additional "Z" codes or specific codes for associated manifestations—such as Q21.1 for atrial septal defects or Q22.1 for pulmonary valve stenosis—to provide a comprehensive medical record. Proper coding is vital for ensuring patients receive appropriate insurance coverage for the multidisciplinary care required for Noonan syndrome.

What are the key clinical features of Noonan syndrome?

The clinical management of Noonan syndrome requires a multidisciplinary approach because the condition affects multiple organ systems. Common features that clinicians monitor include:

• Cardiac anomalies: Present in approximately 50-80% of individuals, most commonly pulmonary valve stenosis and hypertrophic cardiomyopathy.


• Growth patterns: Often characterized by failure to thrive in infancy and short stature, which may be treated with growth hormone therapy in some cases.


• Facial features: Including hypertelorism (widely spaced eyes), low-set ears with thickened helices, and a high-arched palate.


• Musculoskeletal and lymphatic issues: Such as pectus excavatum or carinatum, and occasionally lymphatic dysplasia.


• Developmental milestones: Potential for mild learning disabilities or language delays, requiring early intervention services.

Is Noonan syndrome hereditary?

Noonan syndrome follows an autosomal dominant inheritance pattern. This means that an affected individual has a 50% chance of passing the condition to each of their children. However, it is important to note that many cases of Noonan syndrome occur as a result of a de novo (new) mutation in the affected individual, meaning neither parent carries the genetic variant. A clinical geneticist can provide precise recurrence risk counseling based on the specific family history and genetic test results.

Next steps

• Consult with a clinical geneticist to confirm the diagnosis and discuss family planning or inheritance patterns.


• Schedule regular evaluations with a pediatric cardiologist to monitor for cardiac manifestations common in Noonan syndrome.


• Connect with the DiseaseMaps community to exchange resources with 118 other individuals navigating the daily realities of this diagnosis.


• Work with an endocrinologist if growth velocity is a clinical concern to determine if growth hormone therapy is appropriate.

Medical disclaimer: This content is for informational 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

• NIH Genetic and Rare Diseases Information Center (GARD): Noonan Syndrome.


• Orphanet: ORPHA648 (Noonan Syndrome).


• OMIM (Online Mendelian Inheritance in Man): #163950 (Noonan Syndrome 1).


• Noonan Syndrome Foundation: Clinical Guidelines and Patient Resources.