Clinical psychology within the Italian National Health Service (NHS) is undergoing a structural transition, increasingly required to align with governance principles such as appropriateness and accountability. Yet, these constructs - central to international health policy - have not been systematically articulated within psychological practice. This paper develops a conceptual framework that redefines appropriateness and accountability as intrinsic disciplinary dimensions rather than external administrative requirements. Appropriateness is framed as the alignment of psychological intervention with clinical need, psychosocial context, care pathway positioning, and proportional use of public resources. Accountability is defined as the ability of psychologists to justify decisions, demonstrate outcomes, and contribute to the governance and sustainability of public health services across individual, organisational, and participatory levels. The framework is situated within current developments in the Italian NHS, including the experimental introduction of the primary care psychologist (psicologo di base), the formal integration of psychologists within multidisciplinary care pathways (PDTA), and the increasing relevance of digital data systems and outcome monitoring. A conceptual matrix of appropriateness and a three-phase model of strategic integration are proposed to guide policy, training, and professional practice. By positioning clinical psychology as a system-based public health discipline, the paper offers a theoretical foundation for enhancing its institutional role, improving coordination across care levels, and supporting value-based and equitable healthcare delivery.