ICD-10-CM > G00-G99 > G40-G47 > G40 > G40.4 > G40.42 G40.42 Cyclin-Dependent Kinase-Like 5 Deficiency Disorder Billable/Specific Copy Code Copy Description Applicable To CDKL5 Use Additional code, if known, to identify associated manifestations, such as:cortical blindness (H47.61-)global developmental delay (F88)