FY2027
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Excludes1 pair

J09- vs J10-

J09 and J10 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 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 (non-novel)
  • Influenza › B
  • Influenza › C

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