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. 2019 Feb 19;14(2):e0212463. doi: 10.1371/journal.pone.0212463

Fig 2. Mapping distribution from ARCH terminologies to OMOP.

Fig 2

ICD and CPT codes map to six different tables in OMOP. This is just one (easily visualizable) aspect of the many complexities encountered in mapping. Boxes in the treemap are sized in a logarithmic scale.