B33: Other viral diseases, not elsewhere classified
Codes under B33 (Other viral diseases, not elsewhere classified). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| B33.0 | Epidemic myalgia | ✓ |
| B33.0 | Epidemic myalgia | ✓ |
| B33.1 | Ross River disease | ✓ |
| B33.1 | Ross River disease | ✓ |
| B33.2 | Viral carditis | — |
| B33.2 | Viral carditis | — |
| B33.3 | Retrovirus infections, not elsewhere classified | ✓ |
| B33.3 | Retrovirus infections, not elsewhere classified | ✓ |
| B33.4 | Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS] | ✓ |
| B33.4 | Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS] | ✓ |
| B33.8 | Other specified viral diseases | ✓ |
| B33.8 | Other specified viral diseases | ✓ |
| B33.20 | Viral carditis, unspecified | ✓ |
| B33.20 | Viral carditis, unspecified | ✓ |
| B33.21 | Viral endocarditis | ✓ |
| B33.21 | Viral endocarditis | ✓ |
| B33.22 | Viral myocarditis | ✓ |
| B33.22 | Viral myocarditis | ✓ |
| B33.23 | Viral pericarditis | ✓ |
| B33.23 | Viral pericarditis | ✓ |
| B33.24 | Viral cardiomyopathy | ✓ |
| B33.24 | Viral cardiomyopathy | ✓ |
Frequently asked questions
What is ICD-10-CM code B33?
B33 is an ICD-10-CM category covering Other viral diseases, not elsewhere classified. It contains 22 more specific diagnosis codes, 20 of which are billable.
Is B33 a billable code?
No — B33 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example B33.0 — Epidemic myalgia). 20 of the 22 codes under B33 are billable.
What codes fall under B33?
B33 includes B33.0, B33.0, B33.1, B33.1, B33.2, plus 17 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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