This study evaluated the significant contents and concepts of the Biopsychosocial Assessment Method (MAB) as they relate to the International Classification of Functioning, Disability, and Health (ICF) and the connection between the Geriatric Core Set (GCS) and the different issues of the MAB. We linked the 56 items of the MAB to ICF and GCS categories according to published rules. The most significant concepts included in the MAB enabled the connection of 83 items to the ICF's categories. It was possible to establish a connection with all the components of the ICF except the Body Structures component. Of the 123 categories in the GCS, about 30% did not establish connections with MAB items. The results of this study show that-much like the ICF-the MAB is a tool based on the biopsychosocial model, allowing for a comprehensive and integrated assessment of the different components of functioning. Now, the MAB is the most utilized tool for the evaluation of the geriatric population in Portugal. Thus, it is of the utmost importance that we analyze its results in order to enhance its capabilities. It can then contribute to the creation of a shortened Core Set by the World Health Organization (WHO).