Check the NAICS search to clarify how the industry you are researching is classified, labled and structured.
This site is a free site from the US Government. It also offers data on many industries and sub-industries.
NOTE: The NAICS industry code for health care and social assistance is 62. To see codes for all subindustries as well as SIC codes, go to the U.S. Census's NAICS/SIC Bridge.