The ICD-10 system is set to get even bigger

An additional 1,900 diagnosis codes and 3,651 hospital inpatient procedure codes are being added to the ICD-10 coding system for Fiscal Year (FY) 2017 by CMS and the Centers for Disease Control and Prevention (CDC). The code update is designed in part to remedy the impact of a partial freeze on updates that began prior to the implementation of ICD-10 and is scheduled to end one year after the code set’s October 1, 2015, implementation date. Beginning October 1, 2016, CMS will make regular updates to the code set.


The ICD-10 code set is composed of two parts: the International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM), which is used to report diagnoses in all clinical settings, and the International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS), which is used only to report hospital inpatient procedures. When compared to its predecessor, the code set represents a dramatic update to coding specificity by raising the number of codes from about 13,000 codes to nearly 70,000 (see Weathering the storm of ICD-10’s ‘regulatory tsunami’, Health Law Daily, August 26, 2015). Now, the code set will see further expansion.


As of March 9, 2016, there were 75,625 valid ICD-10-PCS codes for the FY 2017 update. Of those codes, 3,651 are new and 3,549 are cardiovascular system codes. On the diagnostic side, the CDC added 1,900 new ICD-10-CM codes. According to the agencies, the ICD-10-CM/PCS codes will be included in the Inpatient Prospective Payment System Proposed rule, which is expected in April 2017. That rule will include proposed revisions to the Medicare Severity Diagnostic Related Group (MS-DRG) system, which is based on the ICD-10-CM/PCS codes.