The 23 Medicare plans receiving 5 stars from CMS

CMS released 2018 Star Ratings for Medicare Advantage and Part D plans, with approximately 73 percent of all Medicare Advantage enrollees with prescription drug coverage enrolled in a plan earning an overall rating of four stars or higher.

The star ratings measure Medicare Advantage and Part D plan quality and determine Medicare Advantage quality bonus payments. This year, no plan will receive a low performance denotation for the first time since CMS began measuring plans with consistently low performance for at least three years in a row.

Below are the 23 plans receiving a five-star rating, the highest possible, in alphabetical order.

Medicare Advantage with prescription drug coverage

Anthem Health Plans of New Hampshire (Manchester)
Enrollment: 2,003
Service area: Nonemployer group plans in 41 Georgia counties, 46 counties in Kentucky and five counties in New Hampshire; employer group plans in most of the U.S.

Blue Cross and Blue Shield Of Minnesota (Eagan)
Enrollment: 251,069
Service area: 87 counties in Minnesota

Capital District Physicians' Health Plan (Albany, N.Y.)
Enrollment: 3,954
Service area: 62 counties in New York state

Dean Health Plan (Madison, Wis.)
Enrollment: 2,517 
Service area: Seven Wisconsin counties  

Gundersen Health Plan (Onalaska, Wis.)
Enrollment: 14,827
Service area: Five counties in Iowa, 14 counties in Wisconsin

Healthsun Health Plans (Coconut Grove, Fla.)
Enrollment: 39,534
Service area: Two counties in Florida

Kaiser Foundation Health Plan (Honolulu)
Enrollment: 31,427
Service area: Three counties in Hawaii

Kaiser Foundation Health Plan (Oakland, Calif.)
Enrollment: 1.1 million
Service area: 31 counties in California

Kaiser Foundation Health Plan of Colorado (Denver)
Enrollment: 108,915 
Service area: 17 counties in Colorado

Kaiser Foundation Health Plan of the Mid-Atlantic States (Rockville, Md.)
Enrollment: 73,415
Service area: District of Columbia, 11 counties in Maryland, nine counties in Virginia

Kaiser Foundation Health Plan of the Northwest (Portland, Ore.)
Enrollment: 89,048
Service area: Nonemployer group plans in nine Oregon counties and four counties in Washington; employer group plans in one Oregon county and one Washington county

KS Plan Administrators (Pearland, Texas); offers KelseyCare Advantage
Enrollment: 31,481
Service area: Nonemployer group plans in four counties in Texas; employer group plans in 251 Texas counties

Optimum Healthcare (Tampa, Fla.)
Enrollment: 53,203
Service area: 25 counties in Florida

Providence Health Assurance (Portland, Ore.)
Enrollment: 52,895 
Service area: 15 counties in Oregon and three counties in Washington state

Tufts Associated Health Maintenance Organization (Watertown, Mass.)
Enrollment: 101,005
Service area: 10 counties in Massachusetts

Medicare Advantage only 

Medical Associates Clinic Health Plan (Dubuque, Iowa)
Enrollment: 3,460
Service area: Four counties in Wisconsin

Standalone prescription drug plans 

Anthem (Indianapolis) and Blue Cross Blue Shield plans of Massachusetts (Boston); Rhode Island (Providence); Vermont (Montpelier)
Enrollment: 165,585
Service area: Nonemployer group plans in one region in central New England; employer group plans in 37 regions

Dean Health Insurance (Madison)
Enrollment: 40,407
Service area: 35 regions

Excellus Health Plan (Rochester, N.Y.)
Enrollment: 8,644 
Service areas: 39 regions

Health Alliance Medical Plans (Urbana, Ill.)
Enrollment: 704
Service area: 39 regions

HealthPartners (Bloomington, Minn.)
Enrollment: 1,350 
Service area: 34 regions

Tufts Insurance Company (Watertown)
Enrollment: 9,296 
Service area: 35 regions

Wellmark Blue Cross Blue Shield (Des Moines, Iowa) and Blue Cross Blue Shield plans of Minnesota; Montana (Missoula); Nebraska (Omaha); North Dakota (Fargo); Wyoming (Cheyenne)
Enrollment: 288,169
Service area: Nonemployer group plans in one region in the upper Midwest and Northern Plains; employer group plans in 33 regions 

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