Specific code 2012 ICD-9-CM Diagnosis Code 383.9
Unspecified mastoiditis
  • Short description: Mastoiditis NOS.
  • ICD-9-CM 383.9 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 383.9 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 383.9.
  • More recent version(s) of ICD-9-CM 383.9: 2013 2014.
Disease Synonyms
  • Bilat mastoid disorder
  • Bilat mastoiditis
  • Bilateral disorder of mastoid
  • Bilateral mastoiditis
  • Both sides mastoid disorder
  • Both sides mastoiditis
  • Disorder of mastoid
  • Left mastoid disorder
  • Left mastoiditis
  • Mastoid disorder
  • Mastoiditis
  • Right mastoid disorder
  • Right mastoiditis
Convert to ICD-10-CM: 383.9 converts approximately to:
  • 2014 ICD-10-CM H70.90 Unspecified mastoiditis, unspecified ear
ICD-9-CM Volume 2 Index entries containing back-references to 383.9:
  • Disease, diseased - see also Syndrome
    • mastoid (see also Mastoiditis) 383.9
  • Endomastoiditis (see also Mastoiditis) 383.9
  • Mastoiditis (coalescent) (hemorrhagic) (pneumococcal) (streptococcal) (suppurative) 383.9
    • chronic (necrotic) (recurrent) 383.1
    • tuberculous (see also Tuberculosis) 015.6
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 383.9 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 2012 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.