2007 ICD-9-CM Diagnosis Code 491.21 : Obstructive chronic bronchitis with (acute) exacerbation

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2007 ICD-9-CM Diagnosis Code 491.21

Obstructive chronic bronchitis with (acute) exacerbation

Short description: OBS CHR BRONC W(AC) EXAC.
ICD-9-CM 491.21 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 491.21 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
You are viewing the 2007 version of ICD-9-CM 491.21.
More recent version(s) of ICD-9-CM 491.21: 2008 2009 2010 2011 2012 2013 2014 2015.

Convert to ICD-10-CM: 491.21 converts approximately to:

2015/16 ICD-10-CM J44.1 Chronic obstructive pulmonary disease with (acute) exacerbation

Approximate Synonyms

Acute exacerbation of chronic obstructive airways disease
Acute exacerbation of chronic obstructive bronchitis
Acute exacerbation of COPD
Chronic obstructive bronchitis with exacerbation
Chronic obstructive pulmonary disease, acute flare-up
COPD W acute exacerbation

491.21 Excludes

chronic obstructive asthma with acute exacerbation 493.22

Applies To

Acute exacerbation of chronic obstructive pulmonary disease [COPD]
Decompensated chronic obstructive pulmonary disease [COPD]
Decompensated chronic obstructive pulmonary disease [COPD] with exacerbation

ICD-9-CM Volume 2 Index entries containing back-references to 491.21:

Blue
- bloater 491.20
  - with
    - acute bronchitis 491.22
    - exacerbation (acute) 491.21
Bronchitis (diffuse) (hypostatic) (infectious) (inflammatory) (simple) 490
- with
  - emphysema - see Emphysema
  - influenza, flue, or grippe 487.1
  - obstruction airway, chronic 491.20
    - with
      - acute bronchitis 491.22
      - exacerbation (acute) 491.21
  - tracheitis 490
    - acute or subacute 466.0
      - with bronchospasm or obstruction 466.0
    - chronic 491.8
- chronic 491.9
  - with
    - tracheitis (chronic) 491.8
  - asthmatic 493.2
  - catarrhal 491.0
  - chemical (due to fumes and vapors) 506.4
  - due to
    - fumes or vapors (chemical) (inhalation) 506.4
    - radiation 508.8
    - tobacco smoking 491.0
  - mucopurulent 491.1
  - obstructive 491.20
    - with
      - acute bronchitis 491.22
      - exacerbation (acute) 491.21
  - purulent 491.1
  - simple 491.0
  - specified type NEC 491.8
- emphysematous 491.20
  - with
    - acute bronchitis 491.22
    - exacerbation (acute) 491.21
- obstructive (chronic) 491.20
  - with
    - acute bronchitis 491.22
    - exacerbation (acute) 491.21
Disease, diseased - see also Syndrome
- lung NEC 518.89
  - black 500
  - congenital 748.60
  - cystic 518.89
    - congenital 748.4
  - fibroid (chronic) (see also Fibrosis, lung) 515
  - fluke 121.2
    - oriental 121.2
  - in
    - amyloidosis 277.39 [517.8]
    - polymyositis 710.4 [517.8]
    - sarcoidosis 135 [517.8]
    - Sjögren's syndrome 710.2 [517.8]
    - syphilis 095.1
    - systemic lupus erythematosus 710.0 [517.8]
    - systemic sclerosis 710.1 [517.2]
  - interstitial (chronic) 515
    - acute 136.3
  - nonspecific, chronic 496
  - obstructive (chronic) (COPD) 496
    - with
      - acute
        bronchitis 491.22
        exacerbation NEC 491.21
      - alveolitis, allergic (see also Alveolitis, allergic) 495.9
      - asthma (chronic) (obstructive) 493.2
      - bronchiectasis 494.0
        with acute exacerbation 494.1
      - bronchitis (chronic) 491.20
        with
        acute bronchitis 491.22
        exacerbation (acute) 491.21
      - decompensated 491.21
        with exacerbation 491.21
        with
        exacerbation (acute) 491.21
      - emphysema NEC 492.8
    - diffuse (with fibrosis) 496
  - polycystic 518.89
    - asthma (chronic) (obstructive) 493.2
    - congenital 748.4
  - purulent (cavitary) 513.0
  - restrictive 518.89
  - rheumatoid 714.81
    - diffuse interstitial 714.81
  - specified NEC 518.89
- pulmonary - see also Disease, lung
  - amyloid 277.39 [517.8]
  - artery 417.9
  - circulation, circulatory 417.9
    - specified NEC 417.8
  - diffuse obstructive (chronic) 496
    - with
      - acute bronchitis 491.22
      - asthma (chronic) (obstructive) 493.2
      - exacerbation NEC (acute) 491.21
  - heart (chronic) 416.9
    - specified NEC 416.8
  - hypertensive (vascular) 416.0
    - cardiovascular 416.0
  - obstructive diffuse (chronic) 496
    - with
      - acute bronchitis 491.22
      - asthma (chronic) (obstructive) 493.2
      - bronchitis (chronic) 491.20
        acute 491.22
      - exacerbation NEC (acute) 491.21
    - decompensated 491.21
      - with exacerbation 491.21
  - valve (see also Endocarditis, pulmonary) 424.3
Embryoma (M9080/1) - see also Neoplasm, by site, uncertain behavior
- malignant (M9080/3) - see also Neoplasm, by site, malignant
  - kidney (M8960/3) 189.0
  - liver (M8970/3) 155.0
  - testis (M9070/3) 186.9
    - undescended 186.0
      - with
      - acute bronchitis 491.22
      - exacerbation (acute) 491.21
Syndrome - see also Disease
- autosomal - see also Abnormal, autosomes NEC
  - deletion 758.39
    - 5p 758.31
    - 22q11.2 758.32
      - with
      - acute bronchitis 491.22
      - exacerbation (acute) 491.21

491.20

ICD9Data.com

491.22

ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 491.21 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2007 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.

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