ICD-10 Code for Flu
The ICD-10-CM 2027 alphabetic index lists flu with the subterms below. More specific codes depend on the details documented, as listed in the official index (2 codes, 2 billable).
Index entries for Flu
- avian –
J09.X2– see also Influenza, due to, identified novel influenza A virus - bird –
J09.X2– see also Influenza, due to, identified novel influenza A virus - intestinal NEC –
A08.4 - swine (viruses that normally cause infections in pigs) –
J09.X2– see also Influenza, due to, identified novel influenza A virus
How to choose the right code
Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.
Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.