This week, three 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”).

Amsurg (NASDAQ:AMSG) is bettering its rating of C (“hold”) from last week to a B (“buy”) this week. AmSurg, in partnership with physicians, is involved in the development, acquisition, and operation of ambulatory surgery centers. The stock price has risen 5.6% over the past month, better than the 3% increase the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of AMSG stock.

The Providence Service (NASDAQ:PRSC) earns a B this week, jumping up from last week’s grade of C. Providence Service provides government-sponsored social services directly and through not-for-profit social services organizations whose operations it manages, and it arranges for and manages non-emergency transportation services. Wall Street seems to agree with the upgrade and has propelled the stock up 14.2% over the past month. For more information, get Portfolio Grader’s complete analysis of PRSC stock.

Tenet Healthcare (NYSE:THC) is progressing from last week’s rating of B (“buy”) as the company improves to an A (“strong buy”) this week. Tenet Healthcare is an investor-owned health care services company that mainly operates general hospitals and related health care facilities, such as outpatient surgery centers, diagnostic imaging centers and a number of medical office buildings. Investors seem to agree with the upgraded status of the stock, and have pushed the stock up 10.8% over the past month. For more information, get Portfolio Grader’s complete analysis of THC 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.