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    v1.0.28
    OpenPayerBilling CodesChronic lower respiratory diseasesICD-10-CM j45-asthma
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    ICD-10-CM Code For Asthma: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group J45 includes diagnoses for bronchial asthma, covering allergic and nonallergic types, intermittent and persistent patterns, and codes to indicate exacerbations or status asthmaticus. These ICD-10-CM diagnosis codes are used to document clinical encounters that capture asthma severity, control status, and acute complications affecting the lower respiratory system. Accurate coding within the ICD-10-CM J45 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM J45: Asthma Overview

    The ICD-10-CM J45 group captures diagnoses for asthma, a chronic inflammatory disease of the airways affecting the lower respiratory tract. These codes describe different asthma types and control status, including episodic exacerbations and persistent disease. Accurate coding ensures clinical records reflect disease severity and supports proper reimbursement processes.

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    When to Use

    Use a code from this group when documenting encounters for patients with a clinical diagnosis of asthma, including routine management, acute exacerbations, or hospital care for asthma-related complications. Select codes that reflect the asthma type and current status, such as intermittent versus persistent and whether an exacerbation or status asthmaticus is present.

    ICD-10-CM Codes

    18 rows

    ICD-10-CM CodeDescription
    J45.20Mild intermittent asthma, uncomplicated
    J45.21Mild intermittent asthma with (acute) exacerbation
    J45.22Mild intermittent asthma with status asthmaticus
    J45.30Mild persistent asthma, uncomplicated
    J45.31Mild persistent asthma with (acute) exacerbation
    J45.32Mild persistent asthma with status asthmaticus
    J45.40Moderate persistent asthma, uncomplicated
    J45.41Moderate persistent asthma with (acute) exacerbation
    J45.42Moderate persistent asthma with status asthmaticus
    J45.50Severe persistent asthma, uncomplicated
    J45.51Severe persistent asthma with (acute) exacerbation
    J45.52Severe persistent asthma with status asthmaticus
    J45.901Unspecified asthma with (acute) exacerbation
    J45.902Unspecified asthma with status asthmaticus
    J45.909Unspecified asthma, uncomplicated
    J45.990Exercise induced bronchospasm
    J45.991Cough variant asthma
    J45.998Other asthma

    DRG Codes

    4 rows

    DRG CodeDescription
    202Bronchitis and Asthma with CC/MCC
    203Bronchitis and Asthma without CC/MCC
    791Prematurity with Major Problems
    793Full Term Neonate with Major Problems

    Typical Clinical Scenarios

    • A school-aged child presents to urgent care with acute wheezing, cough, and shortness of breath after exposure to a viral upper respiratory infection. On exam the child has expiratory wheezes and increased work of breathing but responds to inhaled bronchodilator therapy; symptoms are consistent with an acute exacerbation of the underlying disease. A diagnosis from this group is assigned to indicate the acute, unspecified severity exacerbation of the chronic respiratory condition. Typical codes: J45.901, J45.902.
    • An adult with a long history of variable respiratory symptoms attends a primary care follow-up for ongoing disease management; they report daily daytime symptoms, nighttime awakenings several times per week, and need for a short-acting bronchodilator more than twice weekly despite controller therapy. The visit documents persistent disease without an acute exacerbation and medication adjustment is made for chronic control. A diagnosis from this group is assigned to reflect persistent disease severity and control status. Typical codes: J45.40, J45.41, J45.42.
    • An elderly patient with multiple comorbidities is hospitalized for acute respiratory failure precipitated by a severe flare of their chronic condition and requires supplemental oxygen and close monitoring. The hospital record attributes the decompensation to a severe exacerbation of the chronic airway disease, and coding must capture the chronic condition when it is the underlying cause of the acute complication. Typical codes: J45.50, J45.51, J45.52.

    Related Codes

    J40-BRONCHITIS-NOT-SPECIFIED

    ICD-10-CM Code For Bronchitis Not Specified As Acute Or Chronic: Group Overview

    J41-SIMPLE-AND-MUCOPURULENT-CHRONIC-BRONCHITIS

    ICD-10-CM Code For Simple And Mucopurulent Chronic Bronchitis: Group Overview

    J42-UNSPECIFIED-CHRONIC-BRONCHITIS

    ICD-10-CM Code For Unspecified Chronic Bronchitis: Group Overview

    J43-EMPHYSEMA

    ICD-10-CM Code For Emphysema: Group Overview

    J44-OTHER-CHRONIC-OBSTRUCTIVE-PULMONARY-DISEASE

    ICD-10-CM Code For Other Chronic Obstructive Pulmonary Disease: Group Overview

    J47-BRONCHIECTASIS

    ICD-10-CM Code For Bronchiectasis: Group Overview

    J4A-CHRONIC-LUNG-ALLOGRAFT-DYSFUNCTION

    ICD-10-CM Code For Chronic Lung Allograft Dysfunction: 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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