Clinical Report: Concerns on Pediatric Hypertension Underdiagnosis and Prevalence

Overview

A large study of 3.75 million pediatric visits revealed that hypertension and elevated blood pressure are substantially underdiagnosed in children and adolescents when relying solely on ICD diagnosis codes. Direct blood pressure measurements from electronic health records identified a much higher prevalence of pediatric hypertension than claims-based data, highlighting potential misclassification and under-recognition in clinical practice.

Background

Hypertension, often called the “silent killer” in adults, is increasingly recognized as a significant health concern beginning in childhood. Elevated blood pressure in children is a key risk factor for adult hypertension and related cardiovascular complications. Despite recommendations from the American Academy of Pediatrics to routinely measure blood pressure in pediatric patients, underdiagnosis remains common due to infrequent measurement and variability in clinical assessment. Accurate epidemiologic estimates are challenged by reliance on administrative claims data, which may not capture true prevalence.

Data Highlights

Key Findings

• Using direct blood pressure measurements, 9% of children and 8.7% of adolescents met criteria for hypertension, compared to only 0.12% and 0.29% identified via ICD diagnosis codes.
• Elevated blood pressure was identified in 2.8% of children and 11% of adolescents in the clinical cohort.
• Only a small fraction of children and adolescents with hypertension or elevated blood pressure based on measurements had corresponding hypertension diagnosis codes (2.2% of children and 7.3% of adolescents with hypertension).
• Hypertension was more common among males, Black and Hispanic children, and those with obesity.
• Treatment with antihypertensive medications was uncommon in both cohorts but increased following initial hypertension identification.
• Variability in blood pressure measurement techniques and factors such as cuff size and measurement site may affect accuracy in pediatric populations.

Clinical Implications

Clinicians should be aware that reliance on administrative diagnosis codes significantly underestimates pediatric hypertension prevalence. Routine and accurate blood pressure measurement using standardized techniques is essential to identify children at risk. Early recognition and management of elevated blood pressure in pediatric patients could improve long-term cardiovascular outcomes.

Conclusion

This study underscores the limitations of claims-based data for pediatric hypertension surveillance and highlights the need for improved measurement and documentation practices. Enhanced detection of elevated blood pressure in children offers an opportunity to intervene early and reduce future cardiovascular risk.

References

1. Horgan et al 2025 -- Pediatric Hypertension Prevalence Using EHR and Claims Data
2. American Academy of Pediatrics 2017 -- Blood Pressure Measurement Recommendations