This week, 3 Health Care Providers & Services stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

HCA Holdings, Inc. (HCA) improves from a D to a B rating this week. HCA Holdings, Inc. operates acute care hospitals, outpatient facilities, clinics and other patient care delivery settings. The company also gets A’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of HCA stock.

Diversicare Healthcare Services, Inc. (DVCR) earns a B this week, jumping up from last week’s grade of C. Diversicare Healthcare Services, Inc. operates nursing homes and retirement centers in the southeastern United States and in Canada. For more information, get Portfolio Grader’s complete analysis of DVCR stock.

This is a strong week for Nobilis Health Corp. (HLTH). The company’s rating climbs to B from the previous week’s C. The company also gets A’s in sales growth, operating margin growth, earnings revisions, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of HLTH 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.