The Mobile Emergency Care Service (SAMU) was developed to address overcrowding in emergency rooms, traditionally considered the gateway to the Unified Health System (SUS) — consolidated as a right to public health in Brazil after the country s political redemocratization process. Although not new, SAMU undergoes recurring adaptation processes. In this context, academic publications on emergency medicine and nursing in the city of Rio de Janeiro point to a serious communication challenge during Pre-Hospital Care (APH) between ambulances, regulation centers, and public hospitals. To develop this picture, the adequacy of design according to degrees of project complexity was addressed, especially when applied to scenarios involving health and public policy issues. This work, therefore, aims to map the transfer of information between APH actors in advanced (high severity) cases through design and data analysis. Its development was carried out through a bibliographic, narrative, and documentary review of health policies in Brazil and the SAMU in the capital city in question, in addition to field research at the Souza Aguiar Municipal Hospital. Methodologies linked to systemic design—an amalgamation of systemic thinking and design practice—were used through the Systems Oriented Design (SOD) approach and its main tool, gigamapping, combined with ZIP Analysis and analysis from a Freirean and Santana systemic perspective. This research highlights the need to build shared knowledge and collective action in conjunction with the use of data for policymaking, by framing a public health problem through the discipline of design for public innovation and incorporation into the political agenda.