Medicare program; changes to the DRG classification system--HCFA. Final notice.

This final notice specifies certain changes in the Diagnosis-Related Group (DRG) classification system. It also lists diagnosis and procedures for which new or revised identifying codes (in the coding system of the International Classification of Diseases-9th Edition-Clinical Modification (ICD-9-CM) on which DRG assignments are based) have been approved. This final notice also specifies the changes to the classification of alcohol and drug abuse DRGs and lists the revisions to the surgical hierarchies.