Specific code 2013 ICD-9-CM Diagnosis Code 491.9
Unspecified chronic bronchitis
  • Short description: Chronic bronchitis NOS.
  • ICD-9-CM 491.9 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 491.9 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 2013 version of ICD-9-CM 491.9.
  • More recent version(s) of ICD-9-CM 491.9: 2014 2015.
Convert to ICD-10-CM: 491.9 converts directly to:
  • 2015/16 ICD-10-CM J42 Unspecified chronic bronchitis
Approximate Synonyms
  • Acute exacerbation of chronic bronchitis
  • Chronic bronchitis
  • Chronic bronchitis with acute exacerbation
ICD-9-CM Volume 2 Index entries containing back-references to 491.9:
  • Bronchitis (diffuse) (hypostatic) (infectious) (inflammatory) (simple) 490
    • senile 491.9
  • Peribronchitis 491.9
    • tuberculous (see also Tuberculosis) 011.3
  • Perichondritis
    • bronchus 491.9
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 491.9 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 2013 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.