Friends:
We get the Multum codes from RxNorm. They use it to build RxNorm, it’s one of the source for Clinical and Branded Drugs (SCD, SBD). They used to be good to map data during ETL. If this is no longer the case (like it isn’t with Medi-Span and FDB-coded durgs), you will need a translation table from the codes provided to RxNorm, vs the codes you have in the data, unfortunately. You can read about what we do have here.
Maybe @Overhage can help. I’ll send him a separate note as well.