Yupeng,
Great job, very impressive!
We’re trying to build a hierarchy out of the Standard RxNorm, CVX and ATC: link1, link2. Cpt4/hcpcs is somehow out of the scope now.
The problem is that they provide the granularity of the different axes and to get the real standardization a new vocabulary would be a choice.
The source vocabulary mappings definitely need a big clean-up, but we started pay additional attention when adding/refreshing them.
Does it sound as a new working group? 