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Health Serv Res. 1986 February; 20(6 Pt 1): 683–703.
PMCID: PMC1068923

Ambulatory care classification systems.


This article describes several methods of classifying resources used in ambulatory care into isoresource consumption groups. These methods are based on resources used by patients during a year, rather than on resources used in a single visit. Variables used to partition patient-year charges into isoresource consumption groups are age, race, number of health problems or major diagnostic categories addressed, number of medications or categories of medications prescribed, and indexes developed to reflect resources used by diagnostic categories during a patient-year. Confirmation in other settings of the findings of this study would have important implications for the design of prospective payment plans for ambulatory care.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Berk AA, Chalmers TC. Cost and efficacy of the substitution of ambulatory for inpatient care. N Engl J Med. 1981 Feb 12;304(7):393–397. [PubMed]
  • Friedman E. Getting to know us. Hospitals may finally learn about true cost and pricing. Hospitals. 1983 Mar 16;57(6):74–82. [PubMed]
  • Hornbrook MC. Hospital case mix: its definition, measurement and use. Part II: Review of alternative measures. Med Care Rev. 1982 Summer;39(2):73–123. [PubMed]
  • Horn SD, Sharkey PD. Measuring severity of illness to predict patient resource use within DRGs. Inquiry. 1983 Winter;20(4):314–321. [PubMed]
  • Fetter RB, Averill RF, Lichtenstein JL, Freeman JL. Ambulatory visit groups: a framework for measuring productivity in ambulatory care. Health Serv Res. 1984 Oct;19(4):415–437. [PMC free article] [PubMed]
  • Rogerson CL, Stimson DH, Simborg DW, Charles G. Classification of ambulatory care using patient-based, time-oriented indexes. Med Care. 1985 Jun;23(6):780–788. [PubMed]
  • Deubner DC, Tyroler HA, Cassel JC, Hames CG, Becker C. Attributable risk, population attributable risk, and population attributable fraction of death associated with hypertension in a biracial population. Circulation. 1975 Nov;52(5):901–908. [PubMed]

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