ICD10 code of Phenylketonuria and ICD9 code

The medical classification for Phenylketonuria (PKU) is standardized for billing and research purposes: the ICD-10 code is E70.0 (Classical phenylketonuria), and the ICD-9 code is 270.1. These codes are essential for healthcare providers to document the condition, manage insurance claims, and track patient health records within clinical systems.

What is the clinical significance of Phenylketonuria?

Phenylketonuria is a rare, inherited metabolic disorder characterized by a deficiency in the enzyme phenylalanine hydroxylase (PAH). Without sufficient PAH, the body cannot break down the amino acid phenylalanine, leading to its accumulation in the blood and brain. If left untreated, this buildup causes significant neurological damage, including intellectual disability, seizures, and behavioral issues. Because Phenylketonuria is manageable through a strict, lifelong low-phenylalanine diet, early detection via newborn screening is critical to ensuring optimal neurodevelopmental outcomes.

How is Phenylketonuria diagnosed and coded?

Diagnosis typically occurs shortly after birth through mandatory newborn screening programs, which measure blood phenylalanine levels. Once a diagnosis is confirmed, clinicians use the ICD-10 code E70.0 to ensure proper documentation of Phenylketonuria in the electronic health record. While the ICD-9 code 270.1 is now considered outdated for current billing, it remains a historical reference in older medical charts and legacy database systems. Accurate coding for Phenylketonuria is vital for accessing specialized metabolic formulas and medical foods, which are often covered by insurance or state programs.

What are the key management strategies for Phenylketonuria?

Effective management of Phenylketonuria requires a multidisciplinary approach involving metabolic specialists, dietitians, and genetic counselors. Because 381 people with Phenylketonuria are currently sharing their experiences on DiseaseMaps.org, we know that community support is as vital as clinical care. Key components of management include:

• Strict Dietary Control: Avoiding high-protein foods like meat, dairy, eggs, and nuts to keep phenylalanine levels within a safe range.


• Medical Formulas: Consuming specialized, phenylalanine-free protein supplements to ensure adequate nutritional intake.


• Frequent Blood Monitoring: Regular testing to track phenylalanine levels and adjust the diet accordingly.


• Pharmacological Adjuncts: For some patients, the medication sapropterin dihydrochloride (a synthetic form of the cofactor BH4) may help increase enzyme activity.

Is Phenylketonuria hereditary?

Yes, Phenylketonuria is an autosomal recessive condition, meaning an affected individual inherits one pathogenic variant in the PAH gene from each parent. Parents who are both carriers of the gene mutation have a 25% chance with each pregnancy of having a child with Phenylketonuria. Genetic counseling is highly recommended for families planning a pregnancy to discuss recurrence risks and the implications of carrier status.

Next steps

• Consult a metabolic specialist or a specialized metabolic clinic to ensure your records are coded correctly for insurance purposes.


• Join the 381-member community at DiseaseMaps.org to connect with others navigating the complexities of Phenylketonuria.


• Verify that your local healthcare provider is following the most current clinical guidelines for the management of Phenylketonuria.


• Request a referral to a genetic counselor if you are planning a family or have concerns about inheritance patterns.

Medical disclaimer: This information is for educational purposes only and does not replace 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: Phenylketonuria (ORPHA:79250)


• NIH Genetic and Rare Diseases Information Center (GARD): Phenylketonuria


• OMIM (Online Mendelian Inheritance in Man): Phenylketonuria (Entry #261600)


• National PKU Alliance (NPKUA)