This week, 6 Health Care Providers & Services stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

Acadia Healthcare Company, Inc. (ACHC) improves from a C to a B rating this week. Acadia Healthcare Company, Inc. provides inpatient behavioral health care services. The company also gets A’s in sales growth. For more information, get Portfolio Grader’s complete analysis of ACHC stock.

U.S. Physical Therapy, Inc.’s (USPH) ratings are looking better this week, moving up to a A from last week’s B. U.S. Physical Therapy, Inc. operates outpatient physical and occupational therapy clinics that provide pre- and post-operative care and treatment for orthopedic-related disorders, sports-related injuries, preventative care, rehabilitation of injured workers and neurological-related injuries. For more information, get Portfolio Grader’s complete analysis of USPH stock.

Air Methods Corporation (AIRM) gets a higher grade this week, advancing from a C last week to a B. Air Methods Corporation provides air medical emergency transport services and systems in the United States. The company also gets A’s in earnings revisions and return on equity. For more information, get Portfolio Grader’s complete analysis of AIRM stock.

Ensign Group, Inc. (ENSG) boosts its rating from a C to a B this week. Ensign Group, Inc. operates facilities offering nursing and rehabilitative care services in multiple states. The company also gets A’s in sales growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of ENSG stock.

InfuSystem Holdings, Inc. (INFU) earns a B this week, jumping up from last week’s grade of C. InfuSystem Holdings, Inc. provides external ambulatory infusion pump services. The company also gets A’s in earnings growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of INFU stock.

This week, Nobilis Health Corp.’s (HLTH) ratings are up from a C last week to a B. The company also gets A’s in sales growth. 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.