Population statistics are sourced from the Australian Bureau of Statistics (ABS) Estimated Resident Population (ERP) statistics as at 30 June. ERP statistics by remoteness and SEIFA (via mapping to Local Government Area) are available from 2001. When calculating MBS services rates, the denominator is the total ERP of an area as at the previous 30 June.
- For any month of the first half of a calendar year, the ERP is as at 30 June of the previous year.
- For any month of the second half of the year, the ERP is as at 30 June of the current year.
The most current ERP is used when the relevant ERP has not been released. Note that for the broad service group of obstetrics, the denominator is restricted to the Australian female ERP population.