unable to keep track of which ICD codes are explainable and which are unexplained

[adalisan]

So I am using a devtools build of the main branch of the pkg. I have a vector of ICD10 codes, and the output vector is shorter, to my understanding this is because some codes have no correspondence or no explanation. However, I can't see how I can get the mapping, Doesn't it make sense to use NA or use a flag to control whether input vectors are shortened.