B81 vs B83.2
B81 and B83.2 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
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 (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
- Meningoencephalitis › eosinophilic
- Infection, infected, infective › Parastrongylus › cantonensis (opportunistic)
- 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