ICD-10 is a comprehensive healthcare coding system introduced by the WHO in 1993 to replace the outdated ICD-9, essential for accurately documenting modern medical diagnoses and procedures. The transition to ICD-10 involves significant changes to healthcare IT systems, staff education, and business processes, with a deadline for compliance set for October 1, 2014, where non-compliance can lead to claim denials. This transition presents challenges, including an increase in codes, the need for dual coding, and potential disruptions to cash flow and revenue cycles.