Excludes1 pair
A93.8 vs B08-
A93.8 and B08 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.
The official note, declared on B08
vesicular stomatitis virus disease (A93.8)
A93.8
Other specified arthropod-borne viral fevers
BillableUnspecified
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- A90-A99
Use when the record says
- Piry virus disease
- Vesicular stomatitis virus disease [Indiana fever]
Indexed under
- Heartland virus disease
- Disease, diseased › Heartland
- Disease, diseased › Nairobi (sheep virus)
- Disease, diseased › Piry virus
- Fever › Indiana
B08
Other viral infections characterized by skin and mucous membrane lesions, not elsewhere classified
Not billable
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- B00-B09
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027