2012AB ICD-9-CM Source Information

Notes

Summary of Changes:

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ICD-9-CM officially has minimal content updates for 2013.  In an effort to synchronize long descriptions in the Metathesaurus with CMS data, a different set of source-provided files has been used for "codes" (represented as TTY = "PT" in the Metathesaurus), resulting in changes in MRCONSO.STR for cases where the CMS long description is different from the 2012 Metathesaurus string.   2012 strings that were identified as lexically different from the CMS 2013 long description have been preserved as entry terms (TTY = "ET").  Chapters, categories and subcategories (represented as TTY = "HT") have mot changed.

Note: On 08/09/2012, CMS issued corrections to full descriptions for 41 diagnoses codes.  These changes were identified too late for incorporation into 2012AB.  Affected codes are:

Source-Provided Files: Summary

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Full and abbreviated code titles:

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

Diagnoses:
CMS30_DESC_LONG_DX.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.

Source-Provided Files: Details

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Files:
CMS<VER>_DESC_LONG_DX.txt
CMS<VER>_DESC_LONG_SG.txt
CMS<VER>_DESC_SHORT_DX.txt
CMS<VER>_DESC_SHORT_SG.txt

Field	Representation
1	Code: MRCONSO.CODE MRCONSO.SDUI Decimal points are added as appropriate, e.g. "00322" becomes "003.22"
2	String: MRCONSO.SAB="ICD9CM" MRCONSO.TTY = "PT" for long descriptions MRCONSO.TTY = "AB" for short descriptions

Attributes and some entry terms (SAB = MTHICD9, TTY = ET) were created by analyzing tags and/or patterns seen in ICD9CM addenda in .pdf format.  Additional updates are made based on interpretation of markup in the "Add" "Revise" or "Delete" tags.