Term	Definition
Hepatitis C ICD-10 codes [24]	Acute hepatitis C (B171) Chronic viral hepatitis C (B182) Chronic viral hepatitis Unspecified (B189) Unspecified viral hepatitis without hepatic coma (B199)
Injecting drug use ICD-10 codes [24,25]	Mental and behavioral disorders due to psychoactive substance use (F11 *, F13 *, F14 *, F15 *, F16 *, and F19 *) Poisoning by drugs (T40.0, T40.1, T40.2, T40.3, T40.4, T40.5, T40.5, T40.6, T40.8, T40.9, T41.1, T41.2, T42.3, T42.4, T43.6, T43.8, T43.9, X42, and X62) Findings of drugs and other substances, not normally found in blood (R78.1 and R78.2) Factors influencing health status and contact with health services (Z50.3, Z71.5, and Z72.2)
Hospital catchment area [20,44]	The combination of the following statistical area 3 (SA3) regions: Glenelg—Southern Grampians Warrnambool Colac—Corangamite Barwon West Surf Coast—Bellarine Peninsula Geelong
	* ICD-10 codes starting with.