| Z99 | Dependence on enabling machines and devices, not elsewhere classified | NON-BILLABLE CODE |
| Z99.0 | Dependence on aspirator | BILLABLE CODE |
| Z99.1 | Dependence on respirator | NON-BILLABLE CODE |
| Z99.11 | Dependence on respirator [ventilator] status | BILLABLE CODE |
| Z99.12 | Encounter for respirator [ventilator] dependence during power failure | BILLABLE CODE |
| Z99.2 | Dependence on renal dialysis | BILLABLE CODE |
| Z99.3 | Dependence on wheelchair | BILLABLE CODE |
| Z99.8 | Dependence on other enabling machines and devices | NON-BILLABLE CODE |
| Z99.81 | Dependence on supplemental oxygen | BILLABLE CODE |
