This week, four health care provider stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Magellan Health, Inc. (MGLN) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. Magellan Health Services coordinates and manages the delivery of behavioral healthcare treatment services. In Portfolio Grader’s specific subcategories of Earnings Surprise and Cash Flow, MGLN also gets A’s. For more information, get Portfolio Grader’s complete analysis of MGLN stock.

Amedisys, Inc. (AMED) boosts its rating from a C to a B this week. Amedisys provides home health care and hospice services in the United States. Shares of the stock have been trading at an exceptionally rapid pace, up 402.6% from the week prior. For more information, get Portfolio Grader’s complete analysis of AMED stock.

Concord Medical Services Holding Ltd. ADR (CCM) is progressing from last week’s rating of B (“buy”) as the company improves to an A (“strong buy”) this week. Concord Medical Services operates a network of radiotherapy and diagnostic imaging centers in the People’’s Republic of China. For more information, get Portfolio Grader’s complete analysis of CCM stock.

This week, Cardinal Health, Inc.’s (CAH) ratings are up from a B last week to an A. Cardinal Health provides products and services related to the safety and productivity of healthcare. Shares of the stock have been changing hands at an unusually rapid pace, three times the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of CAH stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.