This page lists UMLS Metathesaurus data elements and traces them back to the specific source data that populates them.
There were no changes to the original file format. Minor changes were made to the assignment of CODE and SCUI values of atoms with TTY = "HT"
Notes:
CDT in the Metathesaurus is extracted from a file provided by the American Dental Association (ADA). The Metathesaurus also includes the HCPCS version of CDT, which has RSAB = "HCDT." The CDT hierarchy is created from the data file provided by the ADA, while the HCDT hierarchy is created during Metathesaurus production using analysis of the HCPCS printed manual.
File Name | Description |
---|---|
CDT 2023 ASCII Tab Delimited_2022May17.txt | Documentation and tab delimited text file (the data is also available from the ADA as an Excel file) |
ReadMe_CDT 2023_6.3.22.pdf | Documentation |
The following is a list of elements in the CDT source file:
Element | Representation |
---|---|
Code | MRCONSO.CODE MRCONSO.SCUI |
Class | MRSAT.ATN = CHANGE_CLASS Identifies the type of change made to this version of the Code (i.e., changes from the prior version), with the following meanings:
|
Nomenclature | MRCONSO.STR MRCONSO.TTY = PT unless Class = 99 MRCONSO.TTY = OP if Class = 99 MRCONSO.CODE = Code value MRCONSO.SDUI = same as CODE |
Descriptor | MRSAT.ATN = SOS |
Class2 | Not processed; ambiguous as to whether this field refers to the category, subcategory or subsubcategory |
Category | MRCONSO.STR MRCONSO.TTY = HT MRCONSO.CODE = computed based on the range of codes included under this Category MRCONSO.SCUI = same as CODE |
CatDescriptor | MRSAT.ATN = SOS |
Subcat | MRCONSO.STR MRCONSO.TTY = HT MRCONSO.CODE = computed based on the range of codes included under this Subcategory MRCONSO.SCUI = same as CODE Values of "None" are processed the same as null/blank values. |
SubcatDescriptor | MRSAT.ATN = SOS |
Subsubcat | MRCONSO.STR MRCONSO.TTY = HT MRCONSO.CODE = computed based on the range of codes included under this Subsubcategory MRCONSO.SCUI = same as CODE Values of "None" are processed the same as null/blank values. |
SubsubcatDescriptor | MRSAT.ATN = SOS In the case where the Subsubcat value = "None" but the SubsubcatDescriptor is populated, the SubsubcatDescriptor is considered an additional SOS for the Subcat. |