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PL_UR_CAT4 is a four category urban-rural designation for the patient's county of residence.
- Starting in the 2014 HCUP databases, the categorization is a simplified adaptation of the 2013 version of the Urban Influence Codes (UIC).
- In the HCUP databases prior to 2014, the categorization is a simplified adaptation of the 2003 version of the Urban Influence Codes UIC.
The 12 categories of the UIC are combined into four broader categories that differentiate between large and small metropolitan, micropolitan, and a non-urban residual as follows:
| PL_UR_CAT4 |
| 2003 UIC Value |
| Value |
Description |
Value |
Description |
| 1 |
Large metropolitan areas with at least 1 million residents |
1 |
Metro - Large metro area of 1 million residents or more |
| 2 |
Small metropolitan areas with less than 1 million residents |
2 |
Metro - Small metro area of less than 1 million residents |
| 3 |
Micropolitan areas |
3 |
Non-Metro - Micropolitan adjacent to large metro |
| 3 |
Micropolitan areas |
5 |
Non-Metro - Micropolitan adjacent to small metro |
| 3 |
Micropolitan areas |
8 |
Non-Metro - Micropolitan not adjacent to a metro area |
| 4 |
Not metropolitan or micropolitan |
4 |
Non-Metro - Noncore adjacent to large metro |
| 4 |
Not metropolitan or micropolitan |
6 |
Non-Metro - Noncore adjacent to small metro with own town |
| 4 |
Not metropolitan or micropolitan |
7 |
Non-Metro - Noncore adjacent to small metro no own town |
| 4 |
Not metropolitan or micropolitan |
9 |
Non-Metro - Noncore adjacent to micro with own town |
| 4 |
Not metropolitan or micropolitan |
10 |
Non-Metro - Noncore adjacent to micro with no own town |
| 4 |
Not metropolitan or micropolitan |
11 |
Non-Metro - Noncore not adjacent to metro or micro with own town |
| 4 |
Not metropolitan or micropolitan |
12 |
Non-Metro - Noncore not adjacent to metro or micro with no own town |
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