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

383.8 Other disorders of mastoid

section notes
383.81   Postauricular fistula
383.89   Disorders of mastoid NEC
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