Purpose: To use the International Classification of Functioning, Disability, and Health (ICF) to classify and describe the concepts of the Behavioral Assessment Screening Tool (BAST), a measure of behavioral disruptions after traumatic brain injury (TBI). Methods: Meaningful concepts in the BAST were linked to the International Classification of Functioning to (1) further explore the validity of the conceptual model of behavior; (2) demonstrate ICF linking as a novel indicator of the content validity; (3) identify International Classification of Functioning concepts that characterize behavior; (4) determine the comprehensiveness of the BAST. Results: The body functions component and the activities and participation component were most frequently addressed in the BAST. The majority of the TBI Core Set categories were included in the BAST and the manifest and latent coders agreed 85% of the time. Conclusions: Linking BAST concepts to the International Classification of Functioning demonstrated the BAST’s content validity and comprehensiveness. This approach provides a model for how ICF coding could be used to assess content validity.Implications for RehabilitationICF coding can be used to assess content validity and refine rehabilitation measures.The Behavioral Assessment Screening Tool can be used for clinical and research purposes to assess behavior as it relates to a wide range of ICF TBI Core Set categories. ICF coding can be used to assess content validity and refine rehabilitation measures. The Behavioral Assessment Screening Tool can be used for clinical and research purposes to assess behavior as it relates to a wide range of ICF TBI Core Set categories.