383.9 MASTOIDITIS NOS


Code Information

Diagnosis Code: 383.9

Short Description: Mastoiditis NOS

Long Description: Unspecified mastoiditis

Code Classification:

  • Diseases of the sense organs (360–389)
    • Diseases of the ear and mastoid process (380-389)
      • 383 Mastoiditis and related conditions
        • 383.9 Mastoiditis NOS

Code Version: 2015 ICD-9-CM


References to Index of Diseases and Injuries

The code 383.9 has the following ICD-9-CM references to the Index of Diseases and Injuries
  • Disease, diseased - see also Syndrome
    • mastoid (see also Mastoiditis) 383.9
      • process 385.9
  • Endomastoiditis (see also Mastoiditis) 383.9
  • Mastoiditis (coalescent) (hemorrhagic) (pneumococcal) (streptococcal) (suppurative) 383.9
    • acute or subacute 383.00
      • with
        • Gradenigo's syndrome 383.02
        • petrositis 383.02
        • specified complication NEC 383.02
        • subperiosteal abscess 383.01
    • chronic (necrotic) (recurrent) 383.1
    • tuberculous (see also Tuberculosis) 015.6

Crosswalk Information

The code 383.9 converts into the following ICD-10 code(s):
ICD-9 Code ICD-10 Code ICD-10 Description
383.9 Right Arrow H70.90 Unspecified mastoiditis, unspecified ear
This ICD-9 to ICD-10 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-9 Code ICD-9 Description
383.00 Acute mastoiditis without complications
383.01 Subperiosteal abscess of mastoid
383.02 Acute mastoiditis with other complications
383.1 Chronic mastoiditis
383.20 Petrositis, unspecified
383.21 Acute petrositis
383.22 Chronic petrositis
383.30 Postmastoidectomy complication, unspecified
383.31 Mucosal cyst of postmastoidectomy cavity
383.32 Recurrent cholesteatoma of postmastoidectomy cavity
383.33 Granulations of postmastoidectomy cavity
383.81 Postauricular fistula
383.89 Other disorders of mastoid


This page was last updated on: 10/1/2014