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RXNORM Mapping for SNOMED

We have medicines listed in our medical system. They are mapped to RxNorm ids.

We want to switch to Snomed . Is there a way to map RxNorm IDs to Snomed concept IDs? Perhaps there is a database with links? Or a service?

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SNOMED and RXNORM are very different in how they present drug information. RXNORM is much more advanced and codes strength, route of administration, packaging information, and product names. SNOMED has mainly main active ingredients and some product names. SNOMED's coverage for durability and management paths is small.

For example SNOMED has no identifiers for Prozac

, but has for Fluoxetine

, which is the main ingredientProzac

In RXNORM, you can find the following connections:

[PROzac Weekly 90 MG Delayed Release Oral Capsule]
-- ingredient --> [Prozac] 
-- precise ingredient --> [Fluoxetine]

And the ingredient concept takes you to SNOMED:

[Fluoxetine]

-->

SNOMEDCT_US:53640004

SNOMEDCT_US:372767007



Keep in mind that most of the ingredients in SNOMED are duplicated as product and substance, and each of these types gives a different relationship.

Three options for implementing this:

The important aspect here is that if you replace the RXNORM IDs with SNOMED IDs, you will lose information, but of course depending on your use case, which can be very good. I would consider using NDC .

Disclaimer: I was an engineer at BioPortal and currently the CTO at Lexigram.

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