| U.S. Region | States in HCUP | States not in NIS |
|---|---|---|
| West | AK, AZ, CA, CO, HI, MT, NM, NV, OR, UT, WA, WY | ID |
| Midwest | IA, IN, IL, KS, MI, MN, MO, ND, NE, OH, SD, WI | n/a |
| Northeast | CT, MA, ME, NJ, NY, PA, RI, VT | NH |
| South | AR, FL, GA, KY, LA, MD, MS, NC, OK, SC, TN, TX, VA, WV | AL, DC, DE |