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2007 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.* > 2007 ICD-9-CM Diagnosis 383.1 Chronic mastoiditis This code may be outdated. View the most recent version of ICD-9-CM 383.1 383.1 is a specific code that can be used to specify a diagnosis 383.1 contains 5 index entries View the ICD-9-CM Volume 1 383.* hierarchy 383.1 also known as: Caries of mastoid Fistula of mastoid 383.1 excludes: tuberculous mastoiditis (015.6) Index entries containing 383.1: Caries (bone) (see also Tuberculosis, bone) 015.9 [730.8] mastoid (chronic) (process) 383.1 Fistula (sinus) 686.9 mastoid (process) (region) 383.1 Mastoiditis (coalescent) (hemorrhagic) (pneumococcal) (streptococcal) (suppurative) 383.9 chronic (necrotic) (recurrent) 383.1 Necrosis, necrotic mastoid (chronic) 383.1 Sclerosis, sclerotic mastoid 383.1