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Appendix 4 – Specialty B - Cardiology70 At The Royal Bournemouth and Christchurch Hospitals NHSFoundation Trust the follow up area covered was Cardiology which wasaudited in 2007/08. This audit was at a specialty level, covering all HRGs /chapters. A sample of 100 cases was provided for audit and none werefound to be unsafe to audit as per NHS CFH standards.Table 11: Specialty B area: coding errorsTotalfromepisodesauditedIncorrectCoderErrorNoncodererrorTotalincorrect% incorrect2009/10 2007/08Primary 100 1 1 2 2.0 10.0diagnosisSecondary 327 2 22 24 7.3 30.7diagnosisPrimary 79 2 0 2 2.5 14.4procedureSecondary 118 0 0 0 0.0 11.6procedureOverall 624 5 23 28 4.5 18.4Table 12: Specialty B area: HRG errorsEpisodesSpellsTotal 100 80Total changing HRG 10 10% changing HRG 10.0 12.5Analysis of coding errors71 The audit identified 28 (4.5 per cent) errors in procedure and diagnosescoding, leading to 10 HRG changes. To enable an accurate HRG levelcomparison between the 2007/08 and 2010/11 audits we have regroupedthe 2007/08 audit data to HRG4. The HRG error rate was 3 per cent in2007/08 if HRG4 was in use in 2007/08 and it would show that HRG codinghas not improved. It is important to note that different OPCS versions mayhave been in use at the time of the audits. This can have an impact on theoverall HRG error rate. The impact of the 10 HRG changes was that theTrust was overcharging its commissioners by £4,699 on the sample tested.Audit Commission Payment by results data assurance framework 34