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
381 Nonsuppurative otitis media and Eustachian tube disorders →
section notes
381.8 Disorders of Eustachian tube →
section notes
381.81   Dysfunct eustachian tube
381.89   Eustachian tube dis NEC
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