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