Icd stands for international classification of diseases. It is a diagnostic tool for standardization of classification of diseases for management of public health and epidemiological purposes.These codes are authorised by the world health organization. Ankle sprain ICD 10 for right angle is 401A for the unspecified ligament. Ankle sprain ICD 10 for the left ankle is 402A. This ICD code for ankle sprain is also for unspecified ligament. However for specific ligaments, ICD 10 codes are different.