J09 vs J10
J09 and J10 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 J09
influenza A/H1N1 (J10.-)
J09
Influenza due to certain identified influenza viruses
Not billable
- Chapter 10
- Diseases of the respiratory system
- Section
- J09-J18
J10
Influenza due to other identified influenza virus
Not billable
- Chapter 10
- Diseases of the respiratory system
- Section
- J09-J18
Use when the record says
- influenza A (non-novel)
- influenza B
- influenza C
Indexed under
- Influenza › A (bronchial) (epidemic) (respiratory (upper)) (unidentified influenza virus)
- Influenza › B (bronchial) (epidemic) (respiratory (upper)) (unidentified influenza virus)
- Influenza › C (bronchial) (epidemic) (respiratory (upper)) (unidentified influenza virus)
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