ICD-9/ICD-10 Transition Tools

The Road to 10 site has been updated.
To streamline access to CMS resources, CMS has merged all up-to-date content from Road to 10 to the main ICD-10 website, cms.gov/ICD10.


Now Available: Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses

The Agency for Healthcare Research and Quality (AHRQ) has released the Clinical Classifications Software Refined (CCSR) for ICD-10-CM diagnoses, which aggregates more than 70,000 ICD-10-CM diagnosis codes into a manageable number of clinically meaningful categories. The categories are organized across 21 body systems, which generally follow the structure of the ICD-10-CM diagnosis chapters. This initial release of the CCSR replaces the beta version of the CCS for ICD-10-CM diagnoses and applies to all ICD-10-CM diagnosis codes through fiscal year 2019.  It provides a means by which to identify specific clinical conditions using ICD-10-CM diagnosis codes. The CCSR for ICD-10-CM capitalizes on the specificity of the ICD-10-CM coding scheme by creating new clinical categories that did not exist in previous versions of the CCS tool and allowing ICD-10-CM codes to be classified in more than one category. The CCSR is intended to be used analytically to examine patterns of health care in terms of cost, utilization and outcomes, rank utilization by diagnoses, and risk adjust by clinical condition.


Refinements to the software include:

  • Capitalizing on the specificity of ICD-10-CM diagnosis coding by adding new CCSR categories to identify conditions, not possible under previous versions of the CCS
  • Allowing individual ICD-10-CM diagnosis codes to be cross-classified to more than one CCSR category, where applicable, without prioritization, allowing researchers greater flexibility with their analyses
  • Providing users with the option of two different output file versions


The CCSR for ICD-10-CM diagnoses can be downloaded from the Tools & Software section of HCUP-US.

Conversion Tool for the ICD-9 CM to ICD-10 CM Transition

  • Easily flags invalid codes and incorrect records
  • Runs quickly on very large data sets with multiple dx per record
  • Shared codes between ICD-9 and ICD-10 are allocated according to other codes on the same record and E coding rules

For a free download of the Conversion Tool (updated February 2016), please complete a download request and return to info@nahdo.org.

  • Updated slides (as of Feb 3, 2016) for version 2 are here: CDC Webinar SAS Macro Dualcoded Feb2016
  • Click HERE to view the updated User Guide
  • A recording of the February 3rd webinar about the updated SAS macro tool and use of dual coded data to access comparability ratios for ICD-based surveillance/morbidity measures is HERE.

Conversion Tool to the ICD-9 CM to ICD-10 CM Transition is made possible through funding from the Center for Surveillance, Epidemiology and Laboratory Services (CSELS) within the Office of Public Health Scientific Services (OPHSS) at the Centers for Disease Control and Prevention (CDC).

H-CUP Healthcare Cost and Utilization Project, Methods Series: Impact of ICD-10-CM/PCS on Research Using Administrative Databases Report #2016-02




  • Training Day 1: ICD-10 Overview

Click HERE to download slides.

  • Training Day 2: Introduction to MapIT Software

Click HERE to download slides.

  • ICD-10-CM Overview & Mapping for Environmental Epidemiology Program

Click HERE to download slides.