Supplement 10 to ITU-T K-series Recommendations provides guidance on the electromagnetic compatibility (EMC) compliance assessment considerations for 5G systems. Given the 5G radio access network (RAN) technical standards are still being finalised, the first version of this Supplement focuses on possible emission and immunity requirements for 5G systems. This Supplement will be revised, if needed, to address the more specific EMC requirements when technical standards of 5G systems are published.