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    OpenPayerBilling CodesInfluenza and pneumoniaICD-10-CM j11-influenza-unidentified-virus
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    ICD-10-CM Code For Influenza Due To Unidentified Influenza Virus: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group J11 includes influenza diagnoses where the causative influenza virus is not identified, covering acute respiratory infection presentations and related complications such as viral pneumonia. These ICD-10-CM diagnosis codes are used to document clinical scenarios including confirmed influenza by clinical diagnosis without laboratory identification, capturing disease severity and organ system involvement when present. Accurate coding within the ICD-10-CM J11 group supports proper claim adjudication and complete clinical documentation for appropriate reimbursement.

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    ICD-10-CM J11: Influenza Due To Unidentified Influenza Virus Overview

    The ICD-10-CM J11 code group represents influenza cases where the specific influenza virus type has not been identified, affecting the respiratory system and potentially leading to complications such as pneumonia or exacerbation of chronic cardiopulmonary disease. These diagnoses capture acute viral respiratory infection presentations and associated severity. Accurate coding matters for reimbursement because it ensures claims reflect the documented clinical condition and supports appropriate claim adjudication.

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    When to Use

    Use a code from this group when influenza is diagnosed clinically or documented without laboratory confirmation of the virus type. Codes apply when the record documents influenza due to an unidentified influenza virus and when coding the associated severity or complications is required.

    ICD-10-CM Codes

    8 rows

    ICD-10-CM CodeDescription
    J11.00Influenza due to unidentified influenza virus with unspecified type of pneumonia
    J11.08Influenza due to unidentified influenza virus with specified pneumonia
    J11.1Influenza due to unidentified influenza virus with other respiratory manifestations
    J11.2Influenza due to unidentified influenza virus with gastrointestinal manifestations
    J11.81Influenza due to unidentified influenza virus with encephalopathy
    J11.82Influenza due to unidentified influenza virus with myocarditis
    J11.83Influenza due to unidentified influenza virus with otitis media
    J11.89Influenza due to unidentified influenza virus with other manifestations

    DRG Codes

    10 rows

    DRG CodeDescription
    152Otitis Media and URI with MCC
    153Otitis Media and URI without MCC
    177Respiratory Infections and Inflammations with MCC
    178Respiratory Infections and Inflammations with CC
    179Respiratory Infections and Inflammations without CC/MCC
    193Simple Pneumonia and Pleurisy with MCC
    194Simple Pneumonia and Pleurisy with CC
    195Simple Pneumonia and Pleurisy without CC/MCC
    865Viral Illness with MCC
    866Viral Illness without MCC

    Typical Clinical Scenarios

    • An adult presents to the emergency department with sudden onset high fever, myalgias, nonproductive cough, and marked malaise over 48 hours during local influenza season; rapid influenza testing is negative or not typeable and no viral subtype is identified. The clinician documents acute influenza illness without identified virus and treats/supports for acute viral respiratory infection; a code from this group is assigned to capture acute influenza without a documented influenza virus. Typical codes: J11.00, J11.08
    • An elderly nursing home resident develops acute worsening of chronic obstructive pulmonary disease with fever, increased sputum production, and hypoxia; testing confirms influenza-like illness but the specific influenza virus is not determined. Because influenza is causing the acute exacerbation of the chronic respiratory condition and the virus is not identified, a code from this group is used to reflect influenza as the infectious trigger and to capture the respiratory involvement. Typical codes: J11.1, J11.82
    • A previously healthy child is evaluated in outpatient clinic for persistent high fever and new-onset otitis media following a week of influenza symptoms; influenza testing was not performed, but the clinician attributes the otitis media as a complication of the recent influenza infection. A code from this group is assigned for influenza due to an unidentified virus with a specified complication or associated secondary infection. Typical codes: J11.81, J11.83

    Related Codes

    J09-INFLUENZA-DUE-TO-CERTAIN-IDENTIFIED-INFLUENZA-VIRUSES

    ICD-10-CM Code For Influenza Due To Certain Identified Influenza Viruses: Group Overview

    J10-INFLUENZA-DUE-TO-OTHER-IDENTIFIED-VIRUS

    ICD-10-CM Code For Influenza Due To Other Identified Influenza Virus: Group Overview

    J12-VIRAL-PNEUMONIA-NOT-ELSEWHERE-CLASSIFIED

    ICD-10-CM Code For Viral Pneumonia Not Elsewhere Classified: Group Overview

    J13-PNEUMONIA-DUE-TO-STREPTOCOCCUS-PNEUMONIAE

    ICD-10-CM Code For Pneumonia Due To Streptococcus Pneumoniae: Group Overview

    J14-PNEUMONIA-DUE-TO-HEMOPHILUS-INFLUENZAE

    ICD-10-CM Code For Pneumonia Due To Hemophilus Influenzae: Group Overview

    J17-PNEUMONIA-IN-DISEASES-CLASSIFIED-ELSEWHERE

    ICD-10-CM Code For Pneumonia In Diseases Classified Elsewhere: Group Overview

    J18-PNEUMONIA-UNSPECIFIED-ORGANISM

    ICD-10-CM Code For Pneumonia Unspecified Organism: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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