Proposed MedDRA Version 23.0 Complex Changes are available for comments

1 August 2019

The MSSO has posted the proposed complex changes for MedDRA Version 23.0 on the MedDRA website. Complex changes are changes to the MedDRA hierarchy, i.e., the High Level Terms (HLTs), High Level Group Terms (HLGTs), or System Organ Classes (SOCs).
We encourage your comments both for and against the proposed complex changes in order to understand the potential impact on your use of MedDRA.
The deadline for your comments to the proposed complex changes is 20 September 2019. Please send your comments to