Of the 38 counties in the U.S where Medicare Advantage enrollment is 75 percent or more, six are in Texas, according to analyses by the Kaiser Family Foundation. Nationwide, Medicare Advantage penetration is, on average, 54 percent, a proportion that increases each year.

Starr County: 81 percent

El Paso County: 76 percent

Hidalgo County: 76 percent

Cameron County: 76 percent

Maverick County: 75 percent

Willacy County: 75 percent

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