B33
⚠ Non-billable
Other viral diseases, not elsewhere classified
ICD-10-CM · FY2026 · Certain Infectious and Parasitic Diseases
Code
B33
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Certain Infectious and Parasitic Diseases
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code B33?
ICD-10-CM code B33 represents Other viral diseases, not elsewhere classified. It is a non-billable header code requiring a more specific subcategory in the Certain Infectious and Parasitic Diseases chapter, effective October 1, 2025 – September 30, 2026.
Is B33 billable?
No. B33 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is B33 in?
B33 belongs to the Certain Infectious and Parasitic Diseases chapter (A00–B99) of ICD-10-CM.
Related codes in the B33 category
B33.0
Epidemic myalgia
Billable
B33.1
Ross River disease
Billable
B33.2
Viral carditis
Non-billable
B33.3
Retrovirus infections, not elsewhere classified
Billable
B33.4
Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS]
Billable
B33.8
Other specified viral diseases
Billable
B33.20
Viral carditis, unspecified
Billable
B33.21
Viral endocarditis
Billable
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