B33 — Other viral diseases, not elsewhere classified
Not billable
Is B33 billable?
No — B33 is a non-billable header code. B33 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 10 billable codes beneath B33.
Billable codes under this header
- B33.0Epidemic myalgia
- B33.1Ross River disease
- B33.3Retrovirus infections, not elsewhere classified
- B33.4Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS]
- B33.8Other specified viral diseases
- B33.20Viral carditis, unspecified
- B33.21Viral endocarditis
- B33.22Viral myocarditis
- B33.23Viral pericarditis
- B33.24Viral cardiomyopathy
B33 at a glance
| Code | B33 |
|---|---|
| Description | Other viral diseases, not elsewhere classified |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Use additional code — inherited from Chapter 1
Report an additional code alongside B33 to fully describe the condition. B33 is sequenced first.
- code to identify resistance to antimicrobial drugs (Z16.-)
Excludes2 — not included here — inherited from Chapter 1
The conditions below are not part of B33, but a patient may have both at the same time. When documentation supports it, B33 and the excluded code may both be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
What codes fall under B33? (6)
How long has B33 existed?
B33 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.