Aims: Cochlear implant (CI) outcomes are typically assessed using auditory perception metrics and self-reported improvements in quality of life. The International Classification of Functioning, Disability, and Health (ICF) model, introduced by the World Health Organisation (WHO) in 2001, offers a comprehensive bio-psychosocial framework for evaluating health and disability. Recently, an ICF-based CI outcome assessment protocol was developed to establish a standardised approach for measuring and describing CI outcomes globally. This study aimed to assess the impact of cochlear implantation in a large cohort of CI recipients using the CI-ICF assessment protocol. Methodology: A retrospective cohort study was conducted to evaluate CI outcomes 12 months post-implantation in 200 adult recipients across three tertiary hospitals participating in the Western Australia (WA) statewide CI program. The CI outcomes were classified using the CI-ICF qualifiers, which categorise disability levels as follows: 0 – no impairment, 1 – mild impairment, 2 – moderate impairment, 3 – severe impairment, and 4 – complete impairment. Results: The study included 200 participants, categorised into unilateral, bimodal, and bilateral CI users. Across all groups, participants demonstrated comparable improvements in both patient-reported outcomes and psychoacoustic measures. Conclusions: The findings underscore the significant benefits of cochlear implantation on auditory function, communication, and overall well-being. The CI-ICF protocol proved effective in evaluating CI outcomes within the WA statewide program, providing a comprehensive assessment that encompassed body functions and structures, as well as activities, participation, and environmental factors. This protocol offers a holistic perspective on the impact of CI, facilitating a standardised, global approach to outcome measurement.