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
383.2 Petrositis →
section notes
383.20   Petrositis NOS
383.21   Acute petrositis
383.22   Chronic petrositis
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