The following Standard Vocabularies are defined for the Cost domain.
In the Standard Vocabulary, both DRG and MS-DRG are implemented under vocabulary_id 40 with full validity information (valid_start_date, valid_end_date). In 2007 after version 25, DRG was revised to MS-DRG with a completely new numbering system, which means that the concept_codes in DRG are not unique (however, the concept_ids are). The change from concept_class "DRG" and "MS-DRG" distinguishes this major revision. Relationship_id 299 links DRG to the corresponding MS-DRG.
APC and Revenue Codes are implemented as a flat concept_level 1 set of concepts with no classifications or cross-references.
Cost domain concepts are listed in the SOURCE_TO_CONCEPT_MAP as records linking the codes to the corresponding concept_ids. No other mapping information is available.