A08 vs J11.2
A08 and J11.2 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.
Viral and other specified intestinal infections
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- A00-A09
Influenza due to unidentified influenza virus with gastrointestinal manifestations
- Chapter 10
- Diseases of the respiratory system
- Section
- J09-J18
- Influenza gastroenteritis NOS
- Influenza › with › digestive manifestations (bronchial) (epidemic) (respiratory (upper)) (unidentified influenza virus)
- Influenza › with › enteritis (bronchial) (epidemic) (respiratory (upper)) (unidentified influenza virus)
- Influenza › with › gastroenteritis (bronchial) (epidemic) (respiratory (upper)) (unidentified influenza virus)
- Influenza › with › gastrointestinal manifestations (bronchial) (epidemic) (respiratory (upper)) (unidentified influenza virus)
These two codes sit in different chapters of the Tabular List, which is usually the clearest signal that they describe different underlying processes rather than different degrees of the same one.
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