| ICD-9 | International Statistical Classification of Disease and Related Health problems 9th edition |
| ICD-10 | International Statistical Classification of Disease and Related Health problems 10th edition |
| SAIL | Secure Anonymised Information Linkage |
| USA | United States of America |
| UK | United Kingdom |
| IGRP | Information Governance Review Panel |
| ALF | Anonymous Linking Field |
| NHS | National Health Service |
| PEDW | Patient Episode Database for Wales |
| OPCS-4.6 | Office of Population, Censuses and Surveys Classification of Surgical Operations and Procedures version 4.6 |
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