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
- 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
- fibroid (chronic) (see also Fibrosis, lung) 515
- fluke 121.2
- in
- interstitial (chronic) 515
- 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
- specified NEC 518.89
- pulmonary - see also Disease, lung
- amyloid 277.39 [517.8]
- artery 417.9
- circulation, circulatory 417.9
- diffuse obstructive (chronic) 496
- with
- acute bronchitis 491.22
- asthma (chronic) (obstructive) 493.2
- exacerbation NEC (acute) 491.21
- heart (chronic) 416.9
- hypertensive (vascular) 416.0
- obstructive diffuse (chronic) 496
- with
- acute bronchitis 491.22
- asthma (chronic) (obstructive) 493.2
- bronchitis (chronic) 491.20
- exacerbation NEC (acute) 491.21
- decompensated 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