Abstract
References
World Health Organisation. International Statistical Classification of Disease
Office of Population Censuses and Surveys. Tabular List of the Classification of Surgical Operations and Procedures. 4th Revision. (OPCS-4)
NHS Committee for Regulation Information Requirements. DSCN April 1997
NHS Information Management Group. Clinical Coding Instruction Manual. Version 1.5 (January 1999)
Data Quality and Clinical Coding Unit (North Western). Good practice guide for clinical coding. October 1999