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
383.3 Complications following mastoidectomy
section notes
383.30   Postmastoid compl NOS
383.31   Postmastoid mucosal cyst
383.32   Postmastoid cholesteatma
383.33   Postmastoid granulations
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