Excludes1 pair
A87- vs B00.3
A87 and B00.3 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 A87
meningitis due to herpesvirus [herpes simplex] (B00.3)
B00.3
Herpesviral meningitis
Billable
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- B00-B09
Indexed under
- Herpes, herpesvirus, herpetic › meningitis (simplex)
- Meningitis › in › herpes virus (simplex)
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