Kaiser Permanente Washington is among the nation’s best healthcare providers for Medicare patients, according to the Centers for Medicare and Medicaid Services’ annual ratings of care and service in the Medicare system.

Kaiser was the only health plan in Washington to receive a five-star rating, the highest possible. Nationally, seven of Kaiser’s eight Medicare Advantage health plans received the the top ranking.

The overall scores for the Medicare star quality ratings are based on care and service quality measures in nine categories, including staying healthy, member satisfaction, managing chronic conditions, customer service, and pharmacy services.

Kaiser’s Medicare Advantage plan includes primary care, specialty, lab, radiology, and pharmacy providers.