This week, the ratings of 4 Health Care Providers & Services stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

DaVita HealthCare Partners Inc. (DVA) slips from a C to a D this week. DaVita HealthCare Partners Inc. operates kidney dialysis centers in the United States. For more information, get Portfolio Grader’s complete analysis of DVA stock.

This is a rough week for Team Health Holdings, Inc. (TMH). The company’s rating falls to D from the previous week’s C. Team Health Holdings, Inc. offers healthcare professionals outsourcing services. For more information, get Portfolio Grader’s complete analysis of TMH stock.

Kindred Healthcare, Inc. (KND) experiences a ratings drop this week, going from last week’s D to a F. Kindred Healthcare, Inc. is a national healthcare services company operating hospitals, nursing centers, institutional pharmacies and a contract rehabilitation services business. The company also gets F’s in earnings growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of KND stock.

BioScrip, Inc. (BIOS) is having a tough week. The company’s rating falls from a C to a D. BioScrip, Inc. provides pharmacy and home health services in the United States. The company also gets F’s in earnings surprise, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of BIOS 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.