2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Nervous System And Sense Organs 320-389 > Diseases Of The Ear And Mastoid Process 380-389 > Mastoiditis And Related Conditions 383.* > 2006 ICD-9-CM Diagnosis 383.9 Unspecified mastoiditis View the most recent version of ICD-9-CM 383.9 Inflammation of the cavity and air cells in the mastoid part of the temporal bone. 383.9 is a specific code that can be used to specify a diagnosis 383.9 contains 3 index entries View the ICD-9-CM Volume 1 383.* hierarchy  Index entries containing 383.9: 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