| U1 | Medicaid level of care 1, as defined by each state |
| U2 | Medicaid level of care 2, as defined by each state |
| U3 | Medicaid level of care 3, as defined by each state |
| U4 | Medicaid level of care 4, as defined by each state |
| U5 | Medicaid level of care 5, as defined by each state |
| U6 | Medicaid level of care 6, as defined by each state |
| U7 | Medicaid level of care 7, as defined by each state |
| U8 | Medicaid level of care 8, as defined by each state |
| U9 | Medicaid level of care 9, as defined by each state |
| UA | Medicaid level of care 10, as defined by each state |
| UB | Medicaid level of care 11, as defined by each state |
| UC | Medicaid level of care 12, as defined by each state |
| UD | Medicaid level of care 13, as defined by each state |
| UE | Used durable medical equipment |
| UF | Services provided in the morning |
| UG | Services provided in the afternoon |
| UH | Services provided in the evening |
| UJ | Services provided at night |
| UK | Services provided on behalf of the client to someone other than the client (collateral relationship) |
| UN | Two patients served |
| UP | Three patients served |
| UQ | Four patients served |
| UR | Five patients served |
| US | Six or more patients served |
