Home > 2015 ICD-9-CM Diagnosis Codes > Diseases Of The Nervous System And Sense Organs 320-389 > Diseases Of The Ear And Mastoid Process 380-389 > Mastoiditis and related conditions 383-
Specific code 2015 ICD-9-CM Diagnosis Code 383.9
Unspecified mastoiditis
  • 2015
  • Billable Thru Sept 30/2015
  • Non-Billable On/After Oct 1/2015

  • ICD-9-CM 383.9 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 383.9 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).
Convert to ICD-10-CM: 383.9 converts approximately to:
  • 2015/16 ICD-10-CM H70.90 Unspecified mastoiditis, unspecified ear
Approximate 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
Clinical Information
  • Inflammation of the honeycomb-like mastoid bone in the skull just behind the ear. It is usually a complication of otitis media
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
 383.89 ICD9Data.com 384 
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 2015 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.
Free ICD-9-CM Codes
Site Information
Free ICD-10-CM/PCS Codes
Free HCPCS Codes