From the Agency for Healthcare Research and Quality (AHRQ):
The NIS’ interactive map presents information on the availability of the American Hospital Association’s hospital identification number (HCUP element AHAID ) for data years 2000 through 2010. The map also provides a graphical representation of the States participating in HCUP for each data year.
The State Databases’ interactive map provides information on the States that include Revisit Variables for data years 2003 through 2010. Users may select a combination of State Databases (the SID , SASD , or SEDD ) and years of interest to see which States had the databases of interest and the Revisit Variables available.