ICD-9-CM Vol. 1 Diagnostic Codes →
6. DISEASES OF THE NERVOUS SYSTEM AND SENSE ORGANS (320-389) →
section notes
DISEASES OF THE EAR AND MASTOID PROCESS (380-389) →
section notes
383 Mastoiditis and related conditions →
section notes
383.00‑383.02   383.0 Acute mastoiditis
383.20‑383.22   383.2 Petrositis
383.30‑383.33   383.3 Complications following mastoidectomy
383.1   Chronic mastoiditis
383.9   Mastoiditis NOS
383.81‑383.89   383.8 Other disorders of mastoid
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