| B33 | Other viral diseases, not elsewhere classified | NON-BILLABLE CODE |
| B33.0 | Epidemic myalgia | BILLABLE CODE |
| B33.2 | Viral carditis | NON-BILLABLE CODE |
| B33.20 | Viral carditis, unspecified | BILLABLE CODE |
| B33.21 | Viral endocarditis | BILLABLE CODE |
| B33.22 | Viral myocarditis | BILLABLE CODE |
| B33.23 | Viral pericarditis | BILLABLE CODE |
| B33.24 | Viral cardiomyopathy | BILLABLE CODE |
| B33.3 | Retrovirus infections, not elsewhere classified | BILLABLE CODE |
| B33.4 | Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS] | BILLABLE CODE |
| B33.8 | Other specified viral diseases | BILLABLE CODE |
