Predictive Value of International Classification of Diseases Codes for Idiopathic Intracranial Hypertension in a University Health System

Conclusions: An ICD-9 or -10 code for IIH had a PPV of 63% for probable or definite IIH in patients with necessary diagnostic testing performed at a single institution. Coding accuracy was improved in patients with an IIH ICD code assigned by an ophthalmologist. Use of coding algorithms considering treatment providers, number of codes, and treatment is a potential strategy to reduce misclassification bias in medical claims–based research on IIH. However, these are associated with a reduced sample size.
Source: Journal of Neuro-Ophthalmology - Category: Opthalmology Tags: Original Contribution Source Type: research