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. 1980 Winter;1(3):49–73.

Table 4. Medicare Beneficiaries: Assignment Rates for Aged and Disabled Beneficiaries by Selected Specialities and Census Region, 1975.

United States Northeast North Central South West
Physician Specialty Percent of Services Assigned Percent of Charges Assigned Percent of Services Assigned Percent of Charges Assigned Percent of Services Assigned Percent of Charges Assigned Percent of Services Assigned Percent of Charges Assigned Percent of Services Assigned Percent of Charges Assigned
Aged:
 Internal Medicine 44.1 48.3 55.8 58.3 26.5 33.2 34.4 36.1 1 1
 General Practice 46.7 49.0 47.1 49.8 29.2 32.5 51.4 51.0 1 1
 General Surgery 49.9 55.3 60.9 67.1 35.4 39.6 51.2 49.3 1 1
 Radiology 59.0 55.5 72.6 64.7 45.3 40.7 62.6 57.7 1 1
Disabled:
 Internal Medicine 57.2 64.2 65.2 72.3 52.1 58.3 51.0 54.0 1 1
 General Practice 59.9 62.3 63.7 63.8 41.5 44.8 62.5 63.2 1 1
 General Surgery 64.2 70.2 79.4 78.2 55.9 65.4 58.6 61.6 1 1
 Radiology 70.0 68.8 83.9 82.6 63.5 61.1 69.2 65.7 1 1