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

Computer Programs and Systems, Inc. (CPSI) is bettering its rating of C (“hold”) from last week to a B (“buy”) this week. Computer Programs and Systems is a healthcare information technology company that designs, develops, markets, installs, and supports computerized information technology systems for small and midsize hospitals. In Portfolio Grader’s specific subcategories of Earnings Revisions and Equity, CPSI also gets A’s. The stock’s dividend yield is 2.3%. For more information, get Portfolio Grader’s complete analysis of CPSI stock.

The rating of Cerner Corporation (CERN) moves up this week, rising from a C to a B. Cerner designs, markets, and installs healthcare information technology, healthcare devices, and content solutions. For more information, get Portfolio Grader’s complete analysis of CERN stock.

This week, athenahealth, Inc. (ATHN) pushes up from a C to a B rating. Athenahealth provides ongoing billing, clinical-related, and other related services to medical group practices primarily in the United States. The stock price has risen 7.7% over the past month, better than the 1.3% decrease the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of ATHN 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.