Characteristics of patients with Wilson disease in the United States: An insurance claims database study

Table 1 Annual number of patients with Wilson disease

Calendar year	Patients with WD in the database
20161	1887
2017	2239
2018	2253
2019	2356
2020	2220
2021	2277

¹2016 was the first full year in which the specific International Classification of Diseases 10 (ICD-10) code for Wilson disease (WD) was used as a claim label in the Clarivate clearinghouse. Because two successive claims with an ICD-10 code for WD are required for case identification, it is possible that the number of incident cases in 2016 was underestimated.