Difficult question to answer from an Icelandic perspective as the DRG system is not used in Iceland for acute care (except for acute surgery), the DRG system is primarily a classification system for diagnoses ICD-10 (International Classification of Diseases) and classification system for procedures/treatments. NCSP-IS (Nordic Classification of Surgical Procedures - Icelandic national version). ICD-10 (International Classification of Diseases) and classification system for procedures/treatments. NCSP-IS (Nordic Classification of Surgical Procedures - Icelandic national version)