The primary objective of this study is to evaluate the efficacy of valbenazine versus placebo on improving chorea in pediatric and adult participants who have dyskinesia due to cerebral palsy (DCP) with choreiform movements.

Key Inclusion Criteria:

1. Medically confirmed diagnosis of DCP (that is, a hyperkinetic movement disorder due to cerebral palsy [CP]) with choreiform movements.
2. Medical conditions are stable and expected to remain stable throughout the study.

Key Exclusion Criteria:

Participants will be excluded from the study if they meet any of the following criteria:

1. Are pregnant or breastfeeding.
2. Have a clinical diagnosis or history of dyskinesia due to condition other than CP.
3. Have inability to swallow soft foods, unless medications can be administered via gastrostomy/gastrojejunostomy tube.
4. Have any suicidal behavior or suicidal ideation in the year prior to screening or on Day 1.
5. Is a substance abuser of any compound.
6. Known history of long QT syndrome or cardiac tachyarrhythmia, or clinically significant electrocardiogram (ECG) abnormalities.