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Appendix 5 – Chapter - JC Skin Surgery80 The appendix gives a detailed breakdown of the clinical coding auditfindings in the specific area audited. It is designed as a technical report forthe clinical coding department at the Trust audited. However PCTs will findthe data useful in understanding the cause of the HRG assignment errorsand the coding errors.81 At the set up meeting the Trust and PCT agreed to audit chapter JC -Skin Surgery as suggested in the benchmarking report. A sample of 70cases was provided for audit and no episodes were found unsafe to auditper NHS CFH standards.Table 15: Chapter area: coding errorsTotal fromepisodesauditedIncorrectCoderErrorNon codererrorTotalincorrect%incorrectPrimary 70 4 5 9 12.9diagnosisSecondary 50 18 3 21 42.0diagnosisPrimary 70 12 0 12 17.1procedureSecondary 39 5 0 5 12.8procedureOverall 229 39 8 47 20.5Table 16: Chapter area: HRG errorsEpisodesSpellsTotal 70 70Total changing HRG 13 13% changing HRG 18.6 18.6Analysis of coding errors82 The audit identified 47 (20.5 per cent) errors in procedure anddiagnoses coding, leading to 13 HRG changes. The impact of the 13 HRGchanges was that the Trust was undercharging its commissioners by £4,594on the sample tested.83 The following areas for improvement has been identified:Audit Commission Payment by results data assurance framework 50