Table A2.

Attribution Status by Rural-Urban Commuting Area (RUCA) Codes, 2010

	Rural Urban Commuting Codes			Observations, %
	Metropolitan Areas: core, high commuting, and low commuting	Micropolitan Areas: core, high commuting, low commuting	Small Towns (core, high commuting, low commuting), Rural Areas, Not Coded Areas
	1, 1.1, 2, 2.1, 3	4, 4.1, 5, 5.1, 6	7, 7.1, 7.2, 8,8.1, 8.2, 9, 10, 10.1, 10.2, 10.3, 99
Attributable to Provider Groups, %	76.0	12.3	11.6	100
Unattributable to Provider Groups, %	76.9	11.5	11.7	100

Notes: N=12,852,274. “Not coded areas” are more likely to be less populated rural areas. Percent may not sum exactly to one hundred due to rounding error. Considering each row separately

Of all attributable beneficiaries

• Attributable beneficiaries in metropolitan areas: 76.03%
  Attributable beneficiaries in micropolitan areas: 12.33%
  Attributable beneficiaries in small towns and rural areas: 11.64%

Of all unattributable beneficiaries

• Unattributable beneficiaries in metropolitan areas: 76.86%
  Unattributable beneficiaries in micropolitan areas: 11.47%
  Unattributable beneficiaries in small towns and rural areas: 11.66%