Home > 2006 ICD-9-CM Diagnosis Codes > Diseases Of The Respiratory System 460-519 > Chronic Obstructive Pulmonary Disease And Allied Conditions 490-496 > Chronic bronchitis 491-
Specific code 2006 ICD-9-CM Diagnosis Code 491.8
Other chronic bronchitis
  • Short description: CHRONIC BRONCHITIS NEC.
  • ICD-9-CM 491.8 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 491.8 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 2006 version of ICD-9-CM 491.8.
  • More recent version(s) of ICD-9-CM 491.8: 2007 2008 2009 2010 2011 2012 2013 2014 2015.
Convert to ICD-10-CM: 491.8 converts approximately to:
  • 2015/16 ICD-10-CM J41.8 Mixed simple and mucopurulent chronic bronchitis
Approximate Synonyms
  • Acute exacerbation of chronic bronchitis
  • Bronchiolitis fibrosa obliterans
  • Bronchiolitis obliterans
  • Bronchiolitis obliterans with usual interstitial pneumonitis
  • Bronchiolitis obliterans, chronic
  • Bronchiolitis obliterans, subacute
  • Chronic bronchiolitis obliterans
  • Chronic mucus hypersecretion
  • Chronic obliterative bronchiolitis
  • Chronic tracheitis
  • Chronic tracheobronchitis
  • Diffuse panbronchiolitis
  • Drug-induced bronchiolitis obliterans
  • Obliterating fibrous bronchiolitis
  • Obliterative bronchiolitis
  • Subacute bronchiolitis obliterans
  • Subacute obliterative bronchiolitis
  • Toxic bronchiolitis obliterans
  • Tracheobronchitis, chronic
Applies To
  • Chronic:
    • tracheitis
    • tracheobronchitis
ICD-9-CM Volume 2 Index entries containing back-references to 491.8:
  • Bronchiolitis (acute) (infectious) (subacute) 466.19
    • chronic (obliterative) 491.8
    • fibrosa obliterans 491.8
    • obliterans 491.8
      • with organizing pneumonia (B.O.O.P.) 516.8
      • status post lung transplant 996.84
    • obliterative (chronic) (diffuse) (subacute) 491.8
      • due to fumes or vapors 506.4
  • Bronchitis (diffuse) (hypostatic) (infectious) (inflammatory) (simple) 490
    • with
      • emphysema - see Emphysema
      • influenza, flue, or grippe 487.1
      • obstruction airway, chronic 491.20
      • tracheitis 490
        • acute or subacute 466.0
          • with bronchospasm or obstruction 466.0
        • chronic 491.8
    • capillary 466.19
      • with bronchospasm or obstruction 466.19
      • 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
      • purulent 491.1
      • simple 491.0
      • specified type NEC 491.8
    • obliterans 491.8
    • ulcerative 491.8
  • Infection, infected, infective (opportunistic) 136.9
    • trachea, chronic 491.8
  • Laryngotracheobronchitis (see also Bronchitis) 490
    • chronic 491.8
  • Tracheitis (acute) (catarrhal) (infantile) (membranous) (plastic) (pneumococcal) (septic) (suppurative) (viral) 464.10
    • with
      • bronchitis 490
        • acute or subacute 466.0
        • chronic 491.8
        • tuberculosis - see Tuberculosis, pulmonary
      • laryngitis (acute) 464.20
        • with obstruction 464.21
        • chronic 476.1
        • tuberculous (see also Tuberculosis, larynx) 012.3
      • obstruction 464.11
    • chronic 491.8
      • with
        • bronchitis (chronic) 491.8
        • laryngitis (chronic) 476.1
      • due to external agent - see Condition, respiratory, chronic, due to
  • Tracheobronchitis (see also Bronchitis) 490
    • chronic 491.8
    • senile 491.8
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerative 707.9
    • bronchitis 491.8
 491.22 ICD9Data.com 491.9 
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 491.8 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 2006 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.
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