Five health care provider stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

Cross Country Healthcare, Inc.’s (CCRN) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). Cross Country Healthcare provides healthcare staffing and outsourcing services to the healthcare market. In Portfolio Grader’s specific subcategories of Earnings Momentum, Earnings Surprise and Sales Growth, CCRN also gets A’s. Shares of the stock have been trading at an exceptionally rapid pace, up threefold from the week prior. For more information, get Portfolio Grader’s complete analysis of CCRN stock.

This week, Triple-S Management Corporation Class B’s (GTS) ratings are up from an A last week to a C. Triple-S Management is an independent licensee of the Blue Cross Blue Shield Association. Shares of the stock have been changing hands at an unusually rapid pace, up 863.3% from the week prior. For more information, get Portfolio Grader’s complete analysis of GTS stock.

Fresenius Medical Care AG & Co. KGaA Sponsored ADR’s (FMS) ratings are looking better this week, moving up to a B from last week’s C. Fresenius Medical Care offers kidney dialysis services and manufactures and distributes equipment and products used in the treatment of dialysis patients. For more information, get Portfolio Grader’s complete analysis of FMS stock.

This week, Bio-Reference Laboratories, Inc. (BRLI) is showing good progress as the company’s rating jumps from a B (“buy”) last week to an A (“strong buy”). Bio-Reference provides laboratory testing services, primarily to customers in the greater New York metropolitan area. For more information, get Portfolio Grader’s complete analysis of BRLI stock.

DaVita HealthCare Partners Inc. (DVA) improves from a C to a B rating this week. DaVita operates kidney dialysis centers in the United States. Shares of the stock have been trading at an exceptionally rapid pace, up 411% from the week prior. For more information, get Portfolio Grader’s complete analysis of DVA 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.