This week, the overall grades of four Health Care Provider stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This is a rough week for Centene (NYSE:CNC). The company’s rating falls to D (“sell”) from the previous week’s C (“hold”). Centene is a multi-line healthcare enterprise engaged in Medicaid managed care and other specialty services. In Portfolio Grader’s specific subcategory of Earnings Revisions, CNC also gets an F. For more information, get Portfolio Grader’s complete analysis of CNC stock.

The rating of Coventry Health Care (NYSE:CVH) declines this week from C to a D. Coventry Health Care operates health plans, insurance companies, and workers’ compensation services companies. For more information, get Portfolio Grader’s complete analysis of CVH stock.

The rating of Cardinal Health (NYSE:CAH) also slips from a C to a D. Cardinal Health provides products and services related to the safety and productivity of healthcare. For more information, get Portfolio Grader’s complete analysis of CAH stock.

This week, Kindred Healthcare (NYSE:KND) drops from a D (“sell”) to an F (“strong sell”) rating. Kindred Healthcare is a national healthcare services company operating hospitals, nursing centers, institutional pharmacies and a contract rehabilitation services business. The stock gets F’s in Earnings Momentum, Cash Flow, and Margin Growth. For more information, get Portfolio Grader’s complete analysis of KND 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.