ICD-9 versus ICD-10
ICD-10 represents the 10th revision of the International Classification of Diseases (ICD) adopted by the World Health Organization (WHO) in 1994. It is used to categorize diseases and many other types of related issues that are documented on health records and death certificates.
The WHO has authorized the development of the ICD-10-CM (clinical modifications) as well as the ICD-PCS (procedural coding system) for use in the United States. The ICD-10-CM code sets lists diagnosis codes while the ICD-10-PCS contains procedure codes for inpatient reporting for hospitals.
ICD-10 contains a multitude of new diagnosis and procedure codes. The EDI version 5010 is a prerequisite of ICD-10 and has been mandated since January 1, 2012 with a government transaction enforcement date of June 30, 2012. All inpatient claim discharge dates and outpatient service dates that occur on or after October 1, 2015 must use ICD-10 codes. Failure to use these new codes may result in transactions being rejected and delays in reimbursements.