| Z79 | Long term (current) drug therapy | NON-BILLABLE CODE |
| Z79.0 | Long term (current) use of anticoagulants and antithrombotics/antiplatelets | NON-BILLABLE CODE |
| Z79.01 | Long term (current) use of anticoagulants | BILLABLE CODE |
| Z79.02 | Long term (current) use of antithrombotics/antiplatelets | BILLABLE CODE |
| Z79.1 | Long term (current) use of non-steroidal anti-inflammatories (NSAID) | BILLABLE CODE |
| Z79.2 | Long term (current) use of antibiotics | BILLABLE CODE |
| Z79.3 | Long term (current) use of hormonal contraceptives | BILLABLE CODE |
| Z79.4 | Long term (current) use of insulin | BILLABLE CODE |
| Z79.5 | Long term (current) use of steroids | NON-BILLABLE CODE |
| Z79.51 | Long term (current) use of inhaled steroids | BILLABLE CODE |
| Z79.52 | Long term (current) use of systemic steroids | BILLABLE CODE |
| Z79.6 | Long term (current) use of immunomodulators and immunosuppressants | NON-BILLABLE CODE |
| Z79.60 | Long term (current) use of unspecified immunomodulators and immunosuppressants | BILLABLE CODE |
| Z79.61 | Long term (current) use of immunomodulator | BILLABLE CODE |
| Z79.62 | Long term (current) use of immunosuppressant | NON-BILLABLE CODE |
| Z79.620 | Long term (current) use of immunosuppressive biologic | BILLABLE CODE |
| Z79.621 | Long term (current) use of calcineurin inhibitor | BILLABLE CODE |
| Z79.622 | Long term (current) use of Janus kinase inhibitor | BILLABLE CODE |
| Z79.623 | Long term (current) use of mammalian target of rapamycin (mTOR) inhibitor | BILLABLE CODE |
| Z79.624 | Long term (current) use of inhibitors of nucleotide synthesis | BILLABLE CODE |
| Z79.63 | Long term (current) use of chemotherapeutic agent | NON-BILLABLE CODE |
| Z79.630 | Long term (current) use of alkylating agent | BILLABLE CODE |
| Z79.631 | Long term (current) use of antimetabolite agent | BILLABLE CODE |
| Z79.632 | Long term (current) use of antitumor antibiotic | BILLABLE CODE |
| Z79.633 | Long term (current) use of mitotic inhibitor | BILLABLE CODE |
| Z79.634 | Long term (current) use of topoisomerase inhibitor | BILLABLE CODE |
| Z79.64 | Long term (current) use of myelosuppressive agent | BILLABLE CODE |
| Z79.69 | Long term (current) use of other immunomodulators and immunosuppressants | BILLABLE CODE |
| Z79.8 | Other long term (current) drug therapy | NON-BILLABLE CODE |
| Z79.81 | Long term (current) use of agents affecting estrogen receptors and estrogen levels | NON-BILLABLE CODE |
| Z79.810 | Long term (current) use of selective estrogen receptor modulators (SERMs) | BILLABLE CODE |
| Z79.811 | Long term (current) use of aromatase inhibitors | BILLABLE CODE |
| Z79.82 | Long term (current) use of aspirin | BILLABLE CODE |
| Z79.83 | Long term (current) use of bisphosphonates | BILLABLE CODE |
| Z79.84 | Long term (current) use of oral hypoglycemic drugs | BILLABLE CODE |
| Z79.85 | Long-term (current) use of injectable non-insulin antidiabetic drugs | BILLABLE CODE |
| Z79.89 | Other long term (current) drug therapy | NON-BILLABLE CODE |
| Z79.890 | Hormone replacement therapy | BILLABLE CODE |
| Z79.891 | Long term (current) use of opiate analgesic | BILLABLE CODE |
| Z79.899 | Other long term (current) drug therapy | BILLABLE CODE |
