ICD CCS Crosswalk International Classification of Diseases to Clinical Classifications Software Crosswalk

"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:

• Main Clinical Classifications Software (CCS) Page with Single Level CCS Source Files
• CCS Software and User's Guide
• Appendix A: Single-Level Diagnoses
• Appendix B: Single-Level Procedures
• CCS Category Names (Full Labels)
• History of ICD Code Corrections Made to the Single-Level CCS
• Clinical Classifications Software (CCS) for ICD-9-CM Fact Sheet

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

Contact data@nber.org with questions, comments, or suggestions.