This is from v5.0 03-MAY-17, so maybe it is fixed. But gemscript code 55991020 (Levothyroxine sodium 100microgram tablets) maps to two different RxNorm concepts. 40169799 (Levothyroxine Sodium 1 MG Oral Tablet) and 40169766 (Levothyroxine Sodium 0.1 MG Oral Tablet). There are other example like this where the Gemscript code maps to more than one RxNorm code where the descriptions for the RxNorm codes are the same except for the dose amount.
