Accurate knowledge of nuclear data are important for the production of radionuclides to be used in medical applications. This study outlines the availability and scarcity of standardized nuclear data for the production of promising medical radionuclides, focusing on the accelerator route. The data are considered for the radionuclides that have the potentials to be used in theranostic applications, i.e., dual-mode imaging and targeted radionuclide therapy. The present status of nuclear data, current trends in nuclear data publication and further requirements for the production of promising theranostic/therapeutic radionuclides by using accelerators are discussed. This work is expected to provide a basic understanding on the accelerator-based production of promising radionuclides in no carrier added form for theranostic medical applications.