ICD-9 Diagnosis Code 491.9

Chronic bronchitis NOS

Diagnosis Code 491.9

ICD-9: 491.9
Short Description: Chronic bronchitis NOS
Long Description: Unspecified chronic bronchitis
This is the 2014 version of the ICD-9-CM diagnosis code 491.9

Code Classification
  • Diseases of the respiratory system
    • Chronic obstructive pulmonary disease and allied conditions (490-496)
      • 491 Chronic bronchitis

Information for Medical Professionals

Convert to ICD-10 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.
  • J42 - Unspecified chronic bronchitis

Index of Diseases and Injuries
References found for the code 491.9 in the Index of Diseases and Injuries:

Information for Patients


COPD (chronic obstructive pulmonary disease) makes it hard for you to breathe. The two main types are chronic bronchitis and emphysema. The main cause of COPD is long-term exposure to substances that irritate and damage the lungs. This is usually cigarette smoke. Air pollution, chemical fumes, or dust can also cause it.

At first, COPD may cause no symptoms or only mild symptoms. As the disease gets worse, symptoms usually become more severe. They include

  • A cough that produces a lot of mucus
  • Shortness of breath, especially with physical activity
  • Wheezing
  • Chest tightness

Doctors use lung function tests, imaging tests, and blood tests to diagnose COPD. There is no cure. Treatments may relieve symptoms. They include medicines, oxygen therapy, surgery, or a lung transplant. Quitting smoking is the most important step you can take to treat COPD.

NIH: National Heart, Lung, and Blood Institute

  • Blood gases
  • Breathing Better with a COPD Diagnosis - NIH (National Heart, Lung, and Blood Institute)
  • Chronic obstructive pulmonary disease
  • Chronic obstructive pulmonary disease - adults - discharge
  • Chronic obstructive pulmonary disease - control drugs
  • Chronic obstructive pulmonary disease - quick-relief drugs
  • COPD -- how to use a nebulizer
  • COPD -- managing stress and your mood
  • COPD and other health problems
  • COPD flare-ups
  • COPD: Are You at Risk? - NIH (National Heart, Lung, and Blood Institute)
  • Day to day with COPD
  • How to breathe when you are short of breath
  • How to use an inhaler - no spacer
  • How to use an inhaler - with spacer
  • How to use your peak flow meter
  • Lung surgery - discharge
  • Make peak flow a habit!
  • Postural drainage
  • Pulmonary function tests
  • Smoking and COPD
  • Using oxygen at home

[Read More]

Chronic Bronchitis

Bronchitis is an inflammation of the bronchial tubes, the airways that carry air to your lungs. It causes a cough that often brings up mucus, as well as shortness of breath, wheezing, and chest tightness. There are two main types of bronchitis: acute and chronic.

Chronic bronchitis is one type of COPD (chronic obstructive pulmonary disease). The inflamed bronchi produce a lot of mucus. This leads to cough and difficulty getting air in and out of the lungs. Cigarette smoking is the most common cause. Breathing in other fumes and dusts over a long period of time may also cause chronic bronchitis. Treatment will help your symptoms, but chronic bronchitis is a long-term condition that keeps coming back or never goes away completely.

NIH: National Heart, Lung, and Blood Institute

  • How to breathe when you are short of breath
  • Traveling with breathing problems
  • Using oxygen at home

[Read More]
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