The Foreign Medical Teams (FMT) Working Group under the auspices of the Global Health Cluster and the WHO commissioned this document. It introduces a simple classification, minimums standards and a registration form for FMTs that may provide surgical and trauma care arriving within the aftermath of a sudden onset disaster (SOD). These can serve as tools to improve the coordination of the foreign medical team response, and be the reference for registration on arrival as well as a possible global registration mechanism similar to what exists for urban search and rescue teams. The document explains the registration form that allows FMTs to declare their services and capacities, and an overview of the classification system, principles and standards. The definitions, process and technical details of the various requirements for teams to be registered are further elaborated. The classification and standards are designed for FMTs, but can also serve as guidance for developing domestic trauma response capacities. The FMTs are divided into three distinct categories and are expected to declare which category they belong; Type 1, 2 or 3 depending on their capacity and capability matched to the definition of each type, as well as any additional specialist services they can provide. Furthermore they are expected to confirm that they are able and willing to meet the guiding principles and adhere to the minimum standards. The FMT can then, following consultation with the receiving country, provide services within a functioning national hospital or health centre, or offer to bring a field facility with them. This registration process will greatly clarify, to both service providers as well as recipients of the assistance, what type of assistance is offered and will facilitate the on-site coordination. The approach to registration will seek to be inclusive rather than exclusive, with self-declared information on capacities and commitment to adhere to the FMT principles and core standards. If an FMT declares its capability to offer a specific type and declares any additional services, it also is expected to comply with the technical standards of this document related to those services.