Flu-Like Symptoms ICD-10-CM Codes

Flu-Like Symptoms ICD-10-CM Codes

Learn about the flu-like symptoms ICD-10-CM codes you can use through this guide.

By Matt Olivares on Aug 8, 2025.

Fact Checked by Karina Jimenea.

Use Code

What ICD-10 codes are used for flu-like symptoms? 

The term "flu-like symptoms" is broad, covering various conditions. Here are some typical Flu Like Symptoms ICD Codes:

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

Used when a patient is diagnosed with influenza caused by a specific, identified influenza virus (other than novel influenza virus), and exhibits additional respiratory symptoms or complications beyond the typical flu-like symptoms. These respiratory manifestations may include bronchitis, pneumonia, or other respiratory disorders directly associated with the influenza virus.

J11.1 - Influenza due to unidentified influenza virus with other respiratory manifestations

The main difference between the first one is that this code is used when the specific influenza virus causing the infection cannot be identified. The patient presents with flu-like symptoms and additional respiratory manifestations, but the virus responsible for the infection is not determined or is not tested for. 

J11.8 - Influenza due to unidentified influenza virus with other manifestations

Similar to J11.1, this code is used when the specific influenza virus causing the infection cannot be identified. However, the patient may exhibit manifestations beyond just respiratory symptoms in this case. These additional manifestations could include non-respiratory symptoms such as gastrointestinal issues, neurological symptoms, or other systemic manifestations associated with the flu.

Please note this is no longer valid and billable. Please J11.81 (with encephalopathy), J11.82 (with myocarditis), J11.83 (with otitis media), and J11.89 (with other manifestations).

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

This code is used when a patient is diagnosed with influenza caused by a specific, identified influenza virus (other than novel influenza virus), and experiences gastrointestinal symptoms or complications in addition to typical flu-like symptoms. Gastrointestinal manifestations may include symptoms like nausea, vomiting, diarrhea, or abdominal pain.

J11.2 - Influenza due to unidentified influenza virus with gastrointestinal manifestations

Similar to J10.2, this code is used when the specific influenza virus causing the infection cannot be identified, but the patient presents with gastrointestinal symptoms in addition to flu-like symptoms. The gastrointestinal symptoms may be prominent and require medical attention and supportive flu care.

Which flu like symptoms ICD codes are billable?

All of the aforementioned flu like symptoms ICD-10-CM codes are valid and billable except for J11.8.

Clinical information

  • Flu-like symptoms resemble those of the influenza virus but can be caused by various viruses, bacteria, or parasites.
  • Common symptoms include fever, cough, sore throat, runny or stuffy nose, muscle aches, chills, fatigue, headache, nausea, vomiting, and diarrhea.
  • Flu-like illnesses can lead to complications such as pneumonia, bronchitis, and sinus infections.
  • Symptoms usually appear suddenly within 1-2 days of exposure and can last for 3-7 days or longer.
  • These illnesses spread through respiratory droplets when an infected person coughs or sneezes.
  • Supportive care is the main treatment to relieve symptoms, as there is no specific cure.
  • Annual vaccination is the best preventive measure against flu-like illnesses.
  • If experiencing flu-like symptoms, it's important to stay home to avoid spreading the illness, drink plenty of fluids, rest, and take over-the-counter medications for relief.
  • Seek medical attention if symptoms are severe or do not improve after a few days.

Synonyms include

  • Influenza-like illness 
  • Upper respiratory infection 
  • Viral syndrome
  • Respiratory syndrome
  • Nonspecific respiratory illness
  • Undifferentiated respiratory illness
  • Acute respiratory illness

Popular search terms for flu-like symptoms ICD-10-CM codes

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  • ICD-10 flu-like symptoms
  • Flu-like symptoms diagnosis codes
  • ICD-10 codes for flu-like symptoms

Commonly asked questions

ICD-10 code for flu-like symptoms is used when a patient shows influenza-like signs, but the specific cause is unknown. Common symptoms include fever, cough, sore throat, runny or stuffy nose, muscle aches, chills, fatigue, headache, nausea, vomiting, and diarrhea.

The most effective preventive measure against flu-like illnesses is getting an annual vaccination. If you experience flu-like symptoms, stay home to prevent spreading the illness, stay hydrated, get plenty of rest, and use over-the-counter medications for relief.

A diagnosis code for flu-like symptoms is employed to identify a set of symptoms resembling those of the influenza virus, without specifying the exact cause of the illness.

Related ICDs

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