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Unified Medical Language System® (UMLS®)

2013AA UMLS ICD-9-CM Source Information

This page lists UMLS Metathesaurus data elements and traces them back to the specific source data that populates them.

Skip to: Atoms, Attributes, Definitions, Relationships, Mappings

VSAB: ICD9CM_2013_2012_08_06, MTHICD9_2013_2012_08_06

Summary of Changes

On August 8, 2012, CMS issued corrections to full descriptions which affected 41 diagnoses codes.  These changes were  incorporated into 2013AA. 

In cases where the PT string for a given ICD9CM CODE was the same as an existing MTHICD9 Entry Term (ET) , the ET was removed to avoid duplication. 

Source Provided Files:

Full and abbreviated code titles:

Downloaded from https://www.cms.gov/Medicare/Coding/ICD9ProviderDiagnosticCodes/codes.html

Diagnoses:
CMS30_DESC_LONG_DX 080612.txt 
CMS30_DESC_SHORT_DX.txt  

Procedures:
CMS30_DESC_LONG_SG.txt
CMS30_DESC_SHORT_SG.txt     

Entry terms, hierarchy and attributes:

ICD9CM in the Metathesaurus was originally processed in 1999 using a combination of machine-processing and human review.  Through ICD9CM_2012, the Metathesaurus was updated annually using the addenda, available in pdf format from the following sites:
    Diseases:  http://www.cdc.gov/nchs/icd/icd9cm_addenda_guidelines.htm#addenda
    Procedures:  https://www.cms.gov/ICD9ProviderDiagnosticCodes/04_addendum.asp
Attributes, entry terms (SAB = MTHICD9, TTY = ET), and hierarchical Terms (TTY = HT) were extracted from these files.

Identifiers:

Identifiers are assigned as follows:
  • CODE: ICD9CM code value
  • SAUI:  Not applicable
  • SCUI:  Not applicable
  • SDUI: same as CODE
Note:  MTHICD9 "ET" atoms are closely related but not necessarily synonymous with their ICD9CM "PT" or "HT."  Therefore, they are assigned the same SDUI as the ICD9CM "PT" or "HT" with the same code.

Atoms (MRCONSO):

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SAB
Term Type Origin
ICD9CM
AB
CODE:  CMS30_DESC_SHORT_DX.txt, CMS30_DESC_SHORT_SG.txt.  The CODE/SDUI is extracted from the first field.  A decimal point is inserted as appropriate.
STRING:  CMS30_DESC_SHORT_DX.txt, CMS30_DESC_SHORT_SG.txt:  field 2.
SDUI:  Same as CODE
ICD9CM
HT
CODE:  All non-leaf nodes are assigned TTY=HT.  In the .pdf addenda, new HTs are generally tagged as "Chapter," "Category," or "Sub Category"
STRING:  A fully-specified version of the string
SDUI:  Same as CODE
ICD9CM
PT
CODE:  CMS30_DESC_LONG_DX 080612.txt, CMS30_DESC_LONG_SG.txt.  The CODE/SDUI is extracted from the first field.  A decimal point is inserted as appropriate.
STRING:  CMS30_DESC_LONG_DX 080612.txt, CMS30_DESC_LONG_SG.txt:  field 2.
SDUI:  Same as CODE
MTHICD9
ET
CODE:  The ICD-9-CM code corresponding with this entry term.
STRING:  Most MTHICD9 ETs were generated by parsing the 1999 data file, and were then reviewed by Metathesaurus content editors.  In the .pdf addenda, ETs sometimes appear directly under the primary string, or they may be tagged as "Inclusion term". 
SDUI:  Same as CODE

Attributes (MRSAT):

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Attributes were extracted from the .html and .pdf files based on the following guidelines:

Attribute Name Description
Origin
ICA
Additional codes note
Information containing the following pattern:  "Use additional"
ICC
Code also note
Information containing the following pattern:  "Code also"
ICE
Entry term(s)
Entry terms appearing directly under the primary string for a given code.   The ICE attribute contains the original string as it appears in the data file, with "{" used to indicate indentation.  Where applicable, individual entry terms have been extracted and are represented as atoms with SAB="MTHICD9" and TTY="ET"
ICF
Fifth-digit code note
Information containing the following pattern:  "[Ff]ifth-digit"
ICN
Instruction providing additional coding information
Information containing one of the following patterns:  "Code first" "Code, if applicable" "Note:" "Requires"
SOS
Scope note
Information containing one of the following patterns:  "Excludes:" "Includes:"

Definitions (MRDEF):

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No definitions are available for ICD9CM.


Relationships (MRREL):

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REL RELA
Inverse RELA
ORIGIN
PAR/CHD
<no rela>
Hierarchy built from the ICD9CM decimal-based code format, along with higher-level section headings and categories.
RQ
<no rela>
Connect MTHICD9/ET atoms with PT or HT atoms with the same code
SY
<no rela>
Connect PT and AB atoms with the same code

Mappings (MRMAP):

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No mappings are supplied by ICD-9-CM.  Mapping to ICD9CM are supplied by other sources, such as SNOMEDCT.