On average, ACA enrollees nationwide had in-network access to 40% of local physicians in 2021, while 27% of practicing physicians were not a part of any ACA network.
KFF analyzed physician networks in the 30 counties with the highest ACA enrollments, which represent 34% of all ACA enrollees and 21% of the total U.S. population.
Counties ranked by average share of physicians participating in an ACA network:
Cook, Illinois: 14%
Lee, Florida: 23%
Fort Bend, Texas: 24%
San Diego, California: 24%
Orange, California: 25%
Harris, Texas: 25%
Los Angeles, California: 25%
Hillsborough, Florida: 28%
Clark, Nevada: 29%
Santa Clara, California: 29%
Riverside, California: 29%
Dallas, Texas: 29%
San Bernardino, California: 30%
Pinellas, Florida: 31%
Duval, Florida: 31%
Palm Beach, Florida: 31%
Salt Lake, Utah: 33%
Tarrant, Texas: 34%
Collin, Texas: 36%
Miami-Dade, Florida: 36%
Bexar, Texas: 37%
King, Washington: 37%
Maricopa, Arizona: 37%
Osceola, Florida: 38%
Orange, Florida: 38%
Broward, Florida: 38%
Middlesex, Massachusetts: 46%
Gwinnett, Georgia: 46%
Travis, Texas: 49%
Hidalgo, Texas: 61%
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