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ICD-10-CM 2027

ICD-10 code for Flu

J11.1

Influenza due to unidentified influenza virus with other respiratory manifestations

✓ Billable / specific

Confirmed by the official ICD-10-CM index entry “influenza (bronchial) (epidemic) (respiratory (upper)) (unidentified influenza virus)”. Page updated September 29, 2026.

About coding Flu

The ICD-10-CM code for Flu is J11.1 (Influenza due to unidentified influenza virus with other respiratory manifestations). The official index lists 16 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on J11.1.

It is also searched as influenza.

Within J11, choose J11.1 (with other respiratory manifestations) only when documentation doesn't support a more specific option: with pneumonia (J11.0), with gastrointestinal manifestations (J11.2) and with other manifestations (J11.8).

Use an additional code for associated pleural effusion, if applicable (J91.8). Use an additional code for associated sinusitis, if applicable (J01.-).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

Related Flu codes

  • J10.00 Influenza due to other identified influenza virus with unspecified type of pneumonia
  • J10.01 Influenza due to other identified influenza virus with the same other identified influenza virus pneumonia
  • J10.08 Influenza due to other identified influenza virus with other specified pneumonia
  • J10.1 Influenza due to other identified influenza virus with other respiratory manifestations
  • J10.2 Influenza due to other identified influenza virus with gastrointestinal manifestations
  • J10.81 Influenza due to other identified influenza virus with encephalopathy
  • J10.82 Influenza due to other identified influenza virus with myocarditis
  • J10.83 Influenza due to other identified influenza virus with otitis media
  • J10.89 Influenza due to other identified influenza virus with other manifestations
  • J11.00 Influenza due to unidentified influenza virus with unspecified type of pneumonia
  • J11.08 Influenza due to unidentified influenza virus with specified pneumonia
  • J11.2 Influenza due to unidentified influenza virus with gastrointestinal manifestations
  • J11.81 Influenza due to unidentified influenza virus with encephalopathy
  • J11.82 Influenza due to unidentified influenza virus with myocarditis
  • J11.83 Influenza due to unidentified influenza virus with otitis media
  • J11.89 Influenza due to unidentified influenza virus with other manifestations

Common questions about Flu ICD-10 codes

What is the ICD-10 code for Flu?

J11.1 — Influenza due to unidentified influenza virus with other respiratory manifestations. More specific codes apply when the documentation supports them: J10.00, J10.01, J10.08, J10.1 and others below.

What is the ICD-10 code for influenza due to other identified influenza virus with unspecified type of pneumonia?

J10.00 — Influenza due to other identified influenza virus with unspecified type of pneumonia.

What is the ICD-10 code for influenza due to other identified influenza virus with the same other identified influenza virus pneumonia?

J10.01 — Influenza due to other identified influenza virus with the same other identified influenza virus pneumonia.

What is the ICD-10 code for influenza due to other identified influenza virus with other specified pneumonia?

J10.08 — Influenza due to other identified influenza virus with other specified pneumonia.

What is the ICD-10 code for influenza due to other identified influenza virus with other respiratory manifestations?

J10.1 — Influenza due to other identified influenza virus with other respiratory manifestations.

What is the ICD-10 code for influenza due to other identified influenza virus with gastrointestinal manifestations?

J10.2 — Influenza due to other identified influenza virus with gastrointestinal manifestations.

What is the ICD-10 code for influenza due to other identified influenza virus with encephalopathy?

J10.81 — Influenza due to other identified influenza virus with encephalopathy.

Is J11.1 billable?

Yes. J11.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can J11.1 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict J11.1 as a principal diagnosis.

Is J11.1 a CC or MCC?

No. J11.1 is neither a CC nor an MCC under MS-DRG v44.0.