ICD-10 Diagnosis Code J45.901

Unspecified asthma with (acute) exacerbation

Diagnosis Code J45.901

ICD-10: J45.901
Short Description: Unspecified asthma with (acute) exacerbation
Long Description: Unspecified asthma with (acute) exacerbation
This is the 2017 version of the ICD-10-CM diagnosis code J45.901

Code Classification
  • Diseases of the respiratory system
    • Chronic lower respiratory diseases (J40-J47)
      • Asthma (J45)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code J45.901 is grouped in the following Diagnostic Related Group(s) (MS-DRG v33.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.
  • 493.92 - Asthma NOS w (ac) exac

  • Acute asthma
  • Acute exacerbation of asthma
  • Acute exacerbation of asthma co-occurrent with allergic rhinitis
  • Acute exacerbation of immunoglobulin E-mediated allergic asthma
  • Acute exacerbation of intrinsic asthma
  • Acute severe exacerbation of asthma
  • Acute severe exacerbation of immunoglobin E-mediated allergic asthma
  • Acute severe exacerbation of intrinsic asthma
  • Brittle asthma
  • Exacerbation of asthma
  • Immunoglobulin E-mediated allergic asthma
  • Non-allergic asthma

Information for Patients


Asthma is a chronic disease that affects your airways. Your airways are tubes that carry air in and out of your lungs. If you have asthma, the inside walls of your airways become sore and swollen. That makes them very sensitive, and they may react strongly to things that you are allergic to or find irritating. When your airways react, they get narrower and your lungs get less air.

Symptoms of asthma include

  • Wheezing
  • Coughing, especially early in the morning or at night
  • Chest tightness
  • Shortness of breath

Not all people who have asthma have these symptoms. Having these symptoms doesn't always mean that you have asthma. Your doctor will diagnose asthma based on lung function tests, your medical history, and a physical exam. You may also have allergy tests.

When your asthma symptoms become worse than usual, it's called an asthma attack. Severe asthma attacks may require emergency care, and they can be fatal.

Asthma is treated with two kinds of medicines: quick-relief medicines to stop asthma symptoms and long-term control medicines to prevent symptoms.

NIH: National Heart, Lung, and Blood Institute

  • Allergies, asthma, and dust
  • Allergies, asthma, and molds
  • Allergies, asthma, and pollen
  • Asthma
  • Asthma - control drugs
  • Asthma - quick-relief drugs
  • Exercise-induced asthma
  • How to breathe when you are short of breath
  • How to use a nebulizer
  • How to use an inhaler - no spacer
  • How to use an inhaler - with spacer
  • Pulmonary function tests
  • Signs of an asthma attack

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