Excludes1 pair
B81- vs B83.2
B81 and B83.2 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 B81
Angiostrongylus cantonensis (B83.2)
B81
Other intestinal helminthiases, not elsewhere classified
Not billable
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- B65-B83
B83.2
Angiostrongyliasis due to Parastrongylus cantonensis
Billable
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- B65-B83
Use when the record says
- Eosinophilic meningoencephalitis due to Parastrongylus cantonensis
Indexed under
- Meningitis › eosinophilic
- Meningoencephalitis › eosinophilic
- Infection, infected, infective › Parastrongylus › cantonensis
- Infestation › helminth › angiostrongyliasis
- Infestation › Parastrongylus › cantonensis
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