Home > 2012 ICD-9-CM Diagnosis Codes > Diseases Of The Respiratory System 460-519 > Chronic Obstructive Pulmonary Disease And Allied Conditions 490-496 > Chronic bronchitis 491-
2012 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 specify a diagnosis on a reimbursement claim.
- You are viewing the 2012 version of ICD-9-CM 491.21.
- More recent version(s) of ICD-9-CM 491.21: 2013.
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
Convert 491.21 to ICD-10-CM
ICD-9-CM 491.21 converts approximately to:
- 2013 ICD-10-CM J44.1 Chronic obstructive pulmonary disease with (acute) exacerbation
ICD-9-CM Volume 2 Index entries containing back-references to 491.21:
- Blue
- Bronchitis (diffuse) (hypostatic) (infectious) (inflammatory) (simple) 490
with
- 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
- 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
- of childhood, specified NEC 516.69
- polycystic 518.89
- purulent (cavitary) 513.0
- restrictive 518.89
- rheumatoid 714.81
- diffuse interstitial 714.81
- specified NEC 518.89
- pulmonary - see also Disease, lung
- Embryoma (M9080/1) - see also Neoplasm, by site, uncertain behavior
- Syndrome - see also Disease
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 2012 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.
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