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General practitioner services under Medicare.

S J Rosenman1, A Mackinnon

  • 1Woden Valley Hospital, Canberra, ACT.

Australian Journal of Public Health
|December 1, 1992
PubMed
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General practitioner (GP) supply and bulk-billing significantly influenced GP service usage between 1984-1990. Bulk-billing increased service rates independently of medical need, raising questions about healthcare improvement versus overuse.

Area of Science:

  • Health Services Research
  • Health Economics
  • General Practice

Background:

  • Understanding factors influencing healthcare utilization is crucial for resource allocation and policy development.
  • General practitioner (GP) services form the cornerstone of primary healthcare in many developed nations.
  • Previous research has explored the impact of supply-side factors on service delivery, but the independent effect of financial incentives like bulk-billing requires further investigation.

Purpose of the Study:

  • To analyze the determinants of general practitioner (GP) usage and service delivery between 1984 and 1990.
  • To assess the influence of GP numbers, bulk-billing rates, and sociodemographic variables on GP service utilization.
  • To examine the impact of bulk-billing on patient numbers and service rates, independent of medical need.

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Main Methods:

  • Utilized a 10% sample of patient services data from the Commonwealth Department of Health, Housing and Community Services.
  • Aggregated data into 148 electorates for analysis.
  • Conducted separate regression analyses to determine factors influencing GP attendance and services per patient, including growth over time.

Main Results:

  • General practitioner supply, region (metropolitan vs. rural), and age structure were significant determinants of GP usage.
  • Bulk-billing rates explained 9% of variance in patient numbers and 22% in service numbers, even after accounting for sociodemographic factors and GP supply.
  • The effect of bulk-billing on service rates was independent of medical need indicators.

Conclusions:

  • Both bulk-billing policies and GP supply significantly influence patient and doctor behavior regarding GP service utilization.
  • Bulk-billing may lead to increased service rates not necessarily aligned with medical necessity, potentially indicating overuse or demand inducement.
  • Further research is needed to evaluate treatment outcomes and determine if observed effects represent improved healthcare or overuse, given the lack of outcome measures.