7. Total N = 2,269,475, 60% private only, 40% any public
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8. • Method 2 alone attributed 99.99% of enrollees with any public insurance
and 52% of enrollees with private insurance only.
• Method 3 had the highest attribution rate (58%) among privately insured
enrollees, and the cumulative attribution rate of Methods 1–3 was 78% in
that cohort.
• Methods 4–6 did not yield any additional enrollee attributions above what
Methods 1–3 produced.
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9. • Methods 1 and 3 had the highest agreement (77% in private only, 80% in
any public).
• Between 34% and 80% of those whose PCP can be identified by more
than one method were assigned to the same provider by both methods.
• Insurer assignment (Method 2) and the functional assignment methods
agree about 24% to 55% of the time.
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