International Classification of Diseases
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"Developed at the Agency for Healthcare Research and Quality (AHRQ), the Clinical Classifications Software (CCS) is a tool for clustering patient diagnoses and procedures into a manageable number of clinically meaningful categories. CCS offers researchers the ability to group conditions and procedures without having to sort through thousands of codes. This "clinical grouper" makes it easier to quickly understand patterns of diagnoses and procedures so that health plans, policy makers, and researchers can analyze costs, utilization, and outcomes associated with particular illnesses and procedures."
AHRQ provides a lot of information about the CCS:
Please visit http://www.hcup-us.ahrq.gov/toolssoftware/ccs/ccs.jsp for citation of the original source.
Another collection of data sets of ICD9 titles is available.
The SAS, Stata, and CSV files are offered here with uniform file names and variable names to make the ICD HCC crosswalks a bit easier to use.
ICD CCS Crosswalk
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