9.

Only codes defined as definite were used to flag a diagnosis of aortic aneurysm. Read, ICD-10 and OPCS codes used to define aortic aneurysm are listed in Appendix 1. Read, ICD-10 and OPCS codes for aortic aneurysm were further categorised by their description into thoracic, abdominal, thoraco-abdominal or unspecified. ................
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