Appendix C – Algorithm for identifying ARF and RHD in hospital data
The algorithm for identifying acute rheumatic fever (ARF) and rheumatic heart disease (RHD) in hospital data is adopted from the ABDS 2015, where the ICD-10-AM code allocations for identifying RHD and non-rheumatic valvular disease (nRVD) in hospitals data were developed (Katzenellenbogen et al. 2019). Based on this algorithm:
ICD-10-AM codes I05.0, I05.1, I05.2, I06 and I09 are counted under RHD. This includes principal (PDx) and additional (ADx) diagnoses.
However, if the PDx or ADx is I05.8, I05.9, I08.0, I08.1 or I08.3 then:
- if the person is under 60 years of age, does not have nRVD codes (I34–I39) and no congenital heart disease codes (Q20–Q28) then they are classified under RHD
- otherwise, they are counted under nRVD.
ICD-10 codes I07, I08.2, I08.8 and I08.9 are counted under nRVD.
ARF is identified by the ICD-10-AM codes I00–I02.
Katzenellenbogen JM, Bond-Smith D, Seth RJ, Dempsey K, Cannon J, Nedkoff L, Sanfilippo FM, de Klerk N, Hung J, Geelhoed E, Williamson D (2019) The End Rheumatic Heart Disease in Australia Study of Epidemiology (ERASE) Project: data sources, case ascertainment and cohort profile, Clinical Epidemiology, 11:997-1010, doi:10.2147/CLEP.S224621.