B82.0 vs B83.9
B82.0 and B83.9 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 B83.9
intestinal helminthiasis NOS (B82.0)
B82.0
Intestinal helminthiasis, unspecified
BillableUnspecified
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- B65-B83
Indexed under
- Nematodiasis (intestinal)
- Dysentery, dysenteric › metazoal (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical)
- Helminthiasis › intestinal
- Infection, infected, infective › roundwormNEC (opportunistic)
- Infestation › nematode NEC
B83.9
Helminthiasis, unspecified
BillableUnspecified
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- B65-B83
Use when the record says
- Worms NOS
Indexed under
- Colic › worm NOS (bilious) (infantile) (intestinal) (recurrent) (spasmodic)
- Fever › worm (inanition) (of unknown origin) (persistent) (with chills) (with rigor)
- Infection, infected, infective › helminths (opportunistic)
- Infection, infected, infective › worms (opportunistic)
- Infestation › helminth
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